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Pods/YBImageBrowser/LICENSE

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+MIT License
+
+Copyright (c) 2019 杨波
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Pods/YBImageBrowser/README.md

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+![](https://github.com/indulgeIn/YBImageBrowser/blob/master/Images/banner.png)
+
+[![CocoaPods](https://img.shields.io/cocoapods/v/YBImageBrowser.svg)](https://cocoapods.org/pods/YBImageBrowser) 
+[![CocoaPods](https://img.shields.io/cocoapods/p/YBImageBrowser.svg)](https://github.com/indulgeIn/YBImageBrowser) 
+[![License](https://img.shields.io/github/license/indulgeIn/YBImageBrowser.svg)](https://github.com/indulgeIn/YBImageBrowser) 
+
+**iOS 图片浏览器，功能强大，易于拓展，性能优化和内存控制让其运行更加的流畅和稳健。**
+
+##### 相关文章：
+##### [YBImageBrowser 重构心得：如何优化架构、性能、内存？](https://www.jianshu.com/p/ef53d0094437)
+##### [避免 iOS 组件依赖冲突的小技巧](https://www.jianshu.com/p/0e3283275300)
+
+
+## 注意事项
+
+#### 关于 3.x 版本 (使用 2.x 版本请切换到 store_2.x 分支)
+
+为了彻底解决 2.x 版本的设计缺陷和代码漏洞，特花费大量业余时间进行了 3.x 深度重构，所以没办法做到向下兼容，希望社区朋友们能体谅，根据情况进行版本迁移。
+3.x 版本有着更科学的架构，更极致的性能提升，更严格的内存控制，使用起来会更得心应手，也便于将来的迭代优化。
+
+#### 提问须知
+
+考虑到笔者的精力问题，遇到问题请先查看 API、效仿 Demo、阅读 README、搜索 Issues。请不要提出与组件无关的问题，比如 CocoaPods 的错误，如果是 BUG 或 Feature 最好是提 Issue。
+
+# 目录
+
+* [预览](#预览)
+* [特性](#特性)
+* [安装](#安装)
+* [用法](#用法)
+* [常见问题](#常见问题)
+
+
+# 预览
+
+![](https://github.com/indulgeIn/YBImageBrowser/blob/master/Images/preview.gif)
+
+
+
+# 特性
+
+- 支持 GIF，APNG，WebP 等本地和网络图片类型（由 YYImage、SDWebImage 提供支持）。
+- 支持系统相册图片和视频。
+- 支持简单的视频播放。
+- 支持高清图浏览。
+- 支持图片预处理（比如添加水印）。
+- 支持根据图片的大小判断是否需要预先解码（精确控制内存）。
+- 支持图片压缩、裁剪的界限设定。
+- 支持修改下载图片的 NSURLRequest。
+- 支持主动旋转或跟随控制器旋转。
+- 支持自定义图标。
+- 支持自定义 Toast/Loading。
+- 支持自定义文案（默认提供中文和英文）。
+- 支持自定义工具视图（比如查看原图功能）。
+- 支持自定义 Cell（比如添加一个广告模块）。
+- 支持添加到其它父视图上使用（比如加到控制器上）。
+- 支持转场动效、图片布局等深度定制。
+- 支持数据重载、局部更新。
+- 支持低粒度的内存控制和性能调优。
+- 极致的性能优化和严格的内存控制让其运行更加的流畅和稳健。
+
+
+# 安装
+
+## CocoaPods
+
+支持分库导入，核心部分就是图片浏览功能，视频播放作为拓展功能按需导入。
+
+1. 在 Podfile 中添加：
+```
+pod 'YBImageBrowser'
+pod 'YBImageBrowser/Video'  //视频功能需添加
+```
+2. 执行 `pod install` 或 `pod update`。
+3. 导入 `<YBImageBrowser/YBImageBrowser.h>`，视频功能需导入`<YBImageBrowser/YBIBVideoData.h>`。
+4. 注意：如果你需要支持 WebP，可以在 Podfile 中添加 `pod 'YYImage/WebP'`。
+
+若搜索不到库，可执行`pod repo update`，或使用 `rm ~/Library/Caches/CocoaPods/search_index.json` 移除本地索引然后再执行安装，或更新一下 CocoaPods 版本。
+
+#### 去除 SDWebImage 的依赖（版本需 >= 3.0.4）
+
+Podfile 相应的配置变为：
+```
+pod 'YBImageBrowser/NOSD'
+pod 'YBImageBrowser/VideoNOSD'  //视频功能需添加
+```
+这时你必须定义一个类实现`YBIBWebImageMediator`协议，并赋值给`YBImageBrowser`类的`webImageMediator`属性（可以参考 `YBIBDefaultWebImageMediator`的实现）。
+
+
+## 手动导入
+
+1. 下载 YBImageBrowser 文件夹所有内容并且拖入你的工程中，视频功能还需下载 Video 文件夹所有内容。
+2. 链接以下 frameworks：
+* SDWebImage
+* YYImage
+3. 导入 `YBImageBrowser.h`，视频功能需导入`YBIBVideoData.h`
+4. 注意：如果你需要支持 WebP，可以在 Podfile 中添加 `pod 'YYImage/WebP'`，或者到手动下载 [YYImage 仓库](https://github.com/ibireme/YYImage) 的 webP 支持文件。
+
+
+
+
+# 用法
+
+初始化`YBImageBrowser`并且赋值数据源`id<YBIBDataProtocol>`，默认提供`YBIBImageData` (图片) 和`YBIBVideoData` (视频) 两种数据源。
+
+图片处理是组件的核心，笔者精力有限，视频播放做得很轻量，若有更高的要求最好是自定义 Cell，望体谅。
+
+Demo 中提供了很多示例代码，演示较复杂的拓展方式，所以若需要深度定制最好是下载 Demo 查看。
+
+建议不对`YBImageBrowser`进行复用，目前还存在一些逻辑漏洞。
+
+
+## 基本使用
+
+```
+// 本地图片
+YBIBImageData *data0 = [YBIBImageData new];
+data0.imageName = ...;
+data0.projectiveView = ...;
+
+// 网络图片
+YBIBImageData *data1 = [YBIBImageData new];
+data1.imageURL = ...;
+data1.projectiveView = ...;
+
+// 视频
+YBIBVideoData *data2 = [YBIBVideoData new];
+data2.videoURL = ...;
+data2.projectiveView = ...;
+
+YBImageBrowser *browser = [YBImageBrowser new];
+browser.dataSourceArray = @[data0, data1, data2];
+browser.currentPage = ...;
+[browser show];
+```
+
+
+## 设置支持的旋转方向
+
+当图片浏览器依托的 UIViewController 仅支持一个方向：
+
+这种情况通过`YBImageBrowser.new.supportedOrientations`设置图片浏览器支持的旋转方向。
+
+否则：
+
+上面的属性将失效，图片浏览器会跟随控制器的旋转而旋转，由于各种原因这种情况的旋转过渡有瑕疵，建议不使用这种方式。
+
+
+## 自定义图标
+
+修改`YBIBIconManager.sharedManager`实例的属性。
+
+
+## 自定义文案
+
+修改`YBIBCopywriter.sharedCopywriter`实例的属性。
+
+
+## 自定义 Toast / Loading
+
+实现`YBIBAuxiliaryViewHandler`协议，并且赋值给`YBImageBrowser.new.auxiliaryViewHandler`属性，可参考和协议同名的默认实现类。
+
+
+## 自定义工具视图（ToolView）
+
+默认实现的`YBImageBrowser.new.defaultToolViewHandler`处理器可以做一些属性配置，当满足不了业务需求时，最好是进行自定义，参考默认实现或 Demo 中“查看原图”功能实现。
+
+定义一个或多个类实现`YBIBToolViewHandler`协议，并且装入`YBImageBrowser.new.toolViewHandlers`数组属性。建议使用一个中介者来实现这个协议，然后所有的工具视图都由这个中介者来管理，当然也可以让每一个自定义的工具 UIView 都实现`YBIBToolViewHandler`协议，请根据具体需求取舍。
+
+
+## 自定义 Cell
+
+当默认提供的`YBIBImageData` (图片) 和`YBIBVideoData` (视频) 满足不了需求时，可自定义拓展 Cell，参考默认实现或 Demo 中的示例代码。
+
+定义一个实现`YBIBCellProtocol`协议的`UICollectionViewCell`类和一个实现`YBIBDataProtocol`协议的数据类，当要求不高时实现必选协议方法就能跑起来了，若对交互有要求就相对比较复杂，最好是参考默认的交互动效实现。
+
+在某些场景下，甚至可以直接继承项目中的 Cell 来做自定义。
+
+
+# 常见问题
+
+## SDWebImage Pods 版本兼容问题
+
+SDWebImage 有两种情况会出现兼容问题：该库对 SDWebImage 采用模糊向上依赖，但将来 SDWebImage 可能没做好向下兼容；当其它库依赖 SDWebImage 更低或更高 API 不兼容版本。对于这种情况，可以尝试以下方式解决：
+- Podfile 中采用去除 SDWebImage 依赖的方式导入，只需要实现一个中介者（见[安装](#安装)部分）。
+- 更改其它库对 SDWebImage 的依赖版本。
+- 手动导入 YBImageBrowser，然后修改`YBIBDefaultWebImageMediator`文件。
+
+为什么不去除依赖 SDWebImage 自己实现？时间成本太高。
+为什么不拖入 SDWebImage 修改类名？会扩大组件的体积，若外部有 SDWebImage 就存在一份多余代码。
+
+## 依赖的 YYImage 与项目依赖的 YYKit 冲突
+
+实际上 YYKit 有把各个组件拆分出来，建议项目中分开导入：
+```
+pod 'YYModel'
+pod 'YYCache'
+pod 'YYImage'
+pod 'YYWebImage'
+pod 'YYText'
+...
+```
+而且这样更灵活便于取舍。
+
+## 低内存设备 OOM 问题
+
+组件内部会降低在低内存设备上的性能，减小内存占用，但若高清图过多，可能需要手动去控制（以下是硬件消耗很低的状态）：
+
+```
+YBIBImageData *data = YBIBImageData.new;
+// 取消预解码
+data.shouldPreDecodeAsync = NO;
+// 直接设大触发裁剪比例，绘制更小的裁剪区域压力更小，不过可能会让用户感觉奇怪，放很大才开始裁剪显示高清局部（这个属性很多时候不需要显式设置，内部会动态计算）
+data.cuttingZoomScale = 10;
+
+YBImageBrowser *browser = YBImageBrowser.new;
+// 调低图片的缓存数量
+browser.ybib_imageCache.imageCacheCountLimit = 1;
+// 预加载数量设为 0
+browser.preloadCount = 0;
+```
+
+## 视频播放功能简陋
+
+关于大家提的关于视频的需求，有些成本过高，笔者精力有限望体谅。若组件默认的视频播放器满足不了需求，就自定义一个 Cell 吧，把成熟的播放器集成到组件中肯定更加的稳定。
+
+## 关于 Swift 版本
+
+考虑时间成本，目前没有写 Swift 版本的计划。 

Pods/YBImageBrowser/Video/YBIBVideoActionBar.h

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+//
+//  YBIBVideoActionBar.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/11.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class YBIBVideoActionBar;
+
+@protocol YBIBVideoActionBarDelegate <NSObject>
+@required
+
+- (void)yb_videoActionBar:(YBIBVideoActionBar *)actionBar clickPlayButton:(UIButton *)playButton;
+
+- (void)yb_videoActionBar:(YBIBVideoActionBar *)actionBar clickPauseButton:(UIButton *)pauseButton;
+
+- (void)yb_videoActionBar:(YBIBVideoActionBar *)actionBar changeValue:(float)value;
+
+@end
+
+@interface YBIBVideoActionBar : UIView
+
+@property (nonatomic, weak) id<YBIBVideoActionBarDelegate> delegate;
+
+- (void)setMaxValue:(float)value;
+
+- (void)setCurrentValue:(float)value;
+
+- (void)pause;
+
+- (void)play;
+
++ (CGFloat)defaultHeight;
+
+@property (nonatomic, assign, readonly) BOOL isTouchInside;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/Video/YBIBVideoActionBar.m

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+//
+//  YBIBVideoActionBar.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/11.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBVideoActionBar.h"
+#import "YBIBIconManager.h"
+
+
+@interface YBVideoBrowseActionSlider : UISlider
+@end
+@implementation YBVideoBrowseActionSlider
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        [self setThumbImage:YBIBIconManager.sharedManager.videoDragCircleImage() forState:UIControlStateNormal];
+        self.minimumTrackTintColor = UIColor.whiteColor;
+        self.maximumTrackTintColor = [UIColor.whiteColor colorWithAlphaComponent:0.5];
+        self.layer.shadowColor = UIColor.darkGrayColor.CGColor;
+        self.layer.shadowOffset = CGSizeMake(0, 1);
+        self.layer.shadowOpacity = 1;
+        self.layer.shadowRadius = 4;
+    }
+    return self;
+}
+- (CGRect)trackRectForBounds:(CGRect)bounds {
+    CGRect frame = [super trackRectForBounds:bounds];
+    return CGRectMake(frame.origin.x, frame.origin.y, frame.size.width, 2);
+}
+- (CGRect)thumbRectForBounds:(CGRect)bounds trackRect:(CGRect)rect value:(float)value {
+    CGRect frame = [super thumbRectForBounds:bounds trackRect:rect value:value];
+    return CGRectMake(frame.origin.x - 10, frame.origin.y - 10, frame.size.width + 20, frame.size.height + 20);
+}
+@end
+
+
+@interface YBIBVideoActionBar ()
+@property (nonatomic, strong) UIButton *playButton;
+@property (nonatomic, strong) UILabel *preTimeLabel;
+@property (nonatomic, strong) UILabel *sufTimeLabel;
+@property (nonatomic, strong) YBVideoBrowseActionSlider *slider;
+@end
+
+@implementation YBIBVideoActionBar {
+    BOOL _dragging;
+}
+
+#pragma mark - life cycle
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        _dragging = NO;
+        [self addSubview:self.playButton];
+        [self addSubview:self.preTimeLabel];
+        [self addSubview:self.sufTimeLabel];
+        [self addSubview:self.slider];
+    }
+    return self;
+}
+
+- (void)layoutSubviews {
+    [super layoutSubviews];
+    CGFloat width = self.bounds.size.width, height = self.bounds.size.height, labelWidth = 55, buttonWidth = 44, labelOffset = 10;
+    CGFloat imageWidth = YBIBIconManager.sharedManager.videoPlayImage().size.width;
+    CGFloat offset = (buttonWidth - imageWidth) * 0.5;
+    
+    self.playButton.frame = CGRectMake(10, 0, buttonWidth, height);
+    self.preTimeLabel.frame = CGRectMake(CGRectGetMaxX(self.playButton.frame) + labelOffset - offset, 0, labelWidth, height);
+    self.sufTimeLabel.frame = CGRectMake(width - labelWidth - labelOffset, 0, labelWidth, height);
+    self.slider.frame = CGRectMake(CGRectGetMaxX(self.preTimeLabel.frame), 0, CGRectGetMinX(self.sufTimeLabel.frame) - CGRectGetMaxX(self.preTimeLabel.frame), height);
+}
+
+#pragma mark - public
+
++ (CGFloat)defaultHeight {
+    return 44;
+}
+
+- (void)setMaxValue:(float)value {
+    self.slider.maximumValue = value;
+    self.sufTimeLabel.attributedText = [self.class timeformatFromSeconds:value];
+}
+
+- (void)setCurrentValue:(float)value {
+    if (!_dragging) {
+        [self.slider setValue:value animated:YES];
+    }
+    self.preTimeLabel.attributedText = [self.class timeformatFromSeconds:value];
+}
+
+- (void)pause {
+    self.playButton.selected = NO;
+}
+
+- (void)play {
+    _dragging = NO;
+    self.playButton.selected = YES;
+    self.slider.userInteractionEnabled = YES;
+}
+
+#pragma mark - private
+
++ (NSAttributedString *)timeformatFromSeconds:(NSInteger)seconds {
+    NSInteger hour = seconds / 3600, min = (seconds % 3600) / 60, sec = seconds % 60;
+    NSString *text = seconds > 3600 ? [NSString stringWithFormat:@"%02ld:%02ld:%02ld", (long)hour, (long)min, (long)sec] : [NSString stringWithFormat:@"%02ld:%02ld", (long)min, (long)sec];
+    
+    NSShadow *shadow = [NSShadow new];
+    shadow.shadowBlurRadius = 4;
+    shadow.shadowOffset = CGSizeMake(0, 1);
+    shadow.shadowColor = UIColor.darkGrayColor;
+    NSAttributedString *attr = [[NSMutableAttributedString alloc] initWithString:text attributes:@{NSShadowAttributeName:shadow, NSFontAttributeName:[UIFont boldSystemFontOfSize:11]}];
+    return attr;
+}
+
+#pragma mark - touch event
+
+- (void)clickPlayButton:(UIButton *)button {
+    button.userInteractionEnabled = NO;
+    if (button.selected) {
+        [self.delegate yb_videoActionBar:self clickPauseButton:button];
+    } else {
+        [self.delegate yb_videoActionBar:self clickPlayButton:button];
+    }
+    button.userInteractionEnabled = YES;
+}
+
+- (void)respondsToSliderTouchFinished:(UISlider *)slider {
+    [self.delegate yb_videoActionBar:self changeValue:slider.value];
+}
+
+- (void)respondsToSliderTouchDown:(UISlider *)slider {
+    _dragging = YES;
+    slider.userInteractionEnabled = NO;
+}
+
+#pragma mark - getters
+
+- (UIButton *)playButton {
+    if (!_playButton) {
+        _playButton = [UIButton buttonWithType:UIButtonTypeCustom];
+        [_playButton setImage:YBIBIconManager.sharedManager.videoPlayImage() forState:UIControlStateNormal];
+        [_playButton setImage:YBIBIconManager.sharedManager.videoPauseImage() forState:UIControlStateSelected];
+        [_playButton addTarget:self action:@selector(clickPlayButton:) forControlEvents:UIControlEventTouchUpInside];
+        _playButton.layer.shadowColor = UIColor.darkGrayColor.CGColor;
+        _playButton.layer.shadowOffset = CGSizeMake(0, 1);
+        _playButton.layer.shadowOpacity = 1;
+        _playButton.layer.shadowRadius = 4;
+    }
+    return _playButton;
+}
+
+- (UILabel *)preTimeLabel {
+    if (!_preTimeLabel) {
+        _preTimeLabel = [UILabel new];
+        _preTimeLabel.attributedText = [self.class timeformatFromSeconds:0];
+        _preTimeLabel.adjustsFontSizeToFitWidth = YES;
+        _preTimeLabel.textAlignment = NSTextAlignmentCenter;
+        _preTimeLabel.textColor = [UIColor.whiteColor colorWithAlphaComponent:0.9];
+    }
+    return _preTimeLabel;
+}
+
+- (UILabel *)sufTimeLabel {
+    if (!_sufTimeLabel) {
+        _sufTimeLabel = [UILabel new];
+        _sufTimeLabel.attributedText = [self.class timeformatFromSeconds:0];
+        _sufTimeLabel.adjustsFontSizeToFitWidth = YES;
+        _sufTimeLabel.textAlignment = NSTextAlignmentCenter;
+        _sufTimeLabel.textColor = [UIColor.whiteColor colorWithAlphaComponent:0.9];
+    }
+    return _sufTimeLabel;
+}
+
+- (YBVideoBrowseActionSlider *)slider {
+    if (!_slider) {
+        _slider = [YBVideoBrowseActionSlider new];
+        [_slider addTarget:self action:@selector(respondsToSliderTouchFinished:) forControlEvents:UIControlEventTouchUpInside|UIControlEventTouchCancel|UIControlEventTouchUpOutside];
+        [_slider addTarget:self action:@selector(respondsToSliderTouchDown:) forControlEvents:UIControlEventTouchDown];
+    }
+    return _slider;
+}
+
+- (BOOL)isTouchInside {
+    return self.slider.isTouchInside;
+}
+
+@end

Pods/YBImageBrowser/Video/YBIBVideoCell+Internal.h

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+//
+//  YBIBVideoCell+Internal.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/12/23.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBVideoCell.h"
+#import "YBIBVideoView.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBVideoCell ()
+
+@property (nonatomic, strong) YBIBVideoView *videoView;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/Video/YBIBVideoCell.h

@@ -0,0 +1,17 @@
+//
+//  YBIBVideoCell.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/10.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBCellProtocol.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBVideoCell : UICollectionViewCell <YBIBCellProtocol>
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/Video/YBIBVideoCell.m

@@ -0,0 +1,448 @@
+//
+//  YBIBVideoCell.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/10.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBVideoCell.h"
+#import "YBIBVideoData.h"
+#import "YBIBVideoData+Internal.h"
+#import "YBIBCopywriter.h"
+#import "YBIBIconManager.h"
+#import <objc/runtime.h>
+#import "YBIBVideoCell+Internal.h"
+
+@interface NSObject (YBIBVideoPlayingRecord)
+- (void)ybib_videoPlayingAdd:(NSObject *)obj;
+- (void)ybib_videoPlayingRemove:(NSObject *)obj;
+- (BOOL)ybib_noVideoPlaying;
+@end
+@implementation NSObject (YBIBVideoPlayingRecord)
+- (NSMutableSet *)ybib_videoPlayingSet {
+    static void *kRecordKey = &kRecordKey;
+    NSMutableSet *set = objc_getAssociatedObject(self, kRecordKey);
+    if (!set) {
+        set = [NSMutableSet set];
+        objc_setAssociatedObject(self, kRecordKey, set, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    }
+    return set;
+}
+- (void)ybib_videoPlayingAdd:(NSObject *)obj {
+    [[self ybib_videoPlayingSet] addObject:[NSString stringWithFormat:@"%p", obj]];
+}
+- (void)ybib_videoPlayingRemove:(NSObject *)obj {
+    [[self ybib_videoPlayingSet] removeObject:[NSString stringWithFormat:@"%p", obj]];
+}
+- (BOOL)ybib_noVideoPlaying {
+    return [self ybib_videoPlayingSet].count == 0;
+}
+@end
+
+
+@interface YBIBVideoCell () <YBIBVideoDataDelegate, YBIBVideoViewDelegate, UIGestureRecognizerDelegate>
+@end
+
+@implementation YBIBVideoCell {
+    CGPoint _interactStartPoint;
+    BOOL _interacting;
+}
+
+#pragma mark - life cycle
+
+- (void)dealloc {
+    [self.yb_backView ybib_videoPlayingRemove:self];
+}
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        [self initValue];
+        [self.contentView addSubview:self.videoView];
+        [self addGesture];
+    }
+    return self;
+}
+
+- (void)layoutSubviews {
+    [super layoutSubviews];
+    self.videoView.frame = self.bounds;
+}
+
+- (void)initValue {
+    _interactStartPoint = CGPointZero;
+    _interacting = NO;
+}
+
+- (void)prepareForReuse {
+    ((YBIBVideoData *)self.yb_cellData).delegate = nil;
+    self.videoView.thumbImageView.image = nil;
+    [self hideAuxiliaryView];
+    [self.videoView reset];
+    self.videoView.asset = nil;
+    [super prepareForReuse];
+}
+
+#pragma mark - private
+
+- (void)hideAuxiliaryView {
+    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+    [self.yb_auxiliaryViewHandler() yb_hideToastWithContainer:self];
+}
+
+- (void)updateImageLayoutWithOrientation:(UIDeviceOrientation)orientation previousImageSize:(CGSize)previousImageSize {
+    YBIBVideoData *data = self.yb_cellData;
+    UIImage *image = self.videoView.thumbImageView.image;
+    CGSize imageSize = image.size;
+    
+    CGRect imageViewFrame = [data yb_imageViewFrameWithContainerSize:self.yb_containerSize(orientation) imageSize:imageSize orientation:orientation];
+    
+    CGFloat scale;
+    if (previousImageSize.width > 0 && previousImageSize.height > 0) {
+        scale = imageSize.width / imageSize.height - previousImageSize.width / previousImageSize.height;
+    } else {
+        scale = 0;
+    }
+    // '0.001' is admissible error.
+    if (ABS(scale) <= 0.001) {
+        self.videoView.thumbImageView.frame = imageViewFrame;
+    } else {
+        [UIView animateWithDuration:0.25 animations:^{
+            self.videoView.thumbImageView.frame = imageViewFrame;
+        }];
+    }
+}
+
+- (void)hideBrowser {
+    ((YBIBVideoData *)self.yb_cellData).delegate = nil;
+    self.videoView.thumbImageView.hidden = NO;
+    self.videoView.autoPlayCount = 0;
+    [self.videoView reset];
+    [self.videoView hideToolBar:YES];
+    [self.videoView hidePlayButton];
+    self.yb_hideBrowser();
+    _interacting = NO;
+}
+
+- (void)hideToolViews:(BOOL)hide {
+    if (hide) {
+        self.yb_hideToolViews(YES);
+    } else {
+        if ([self.yb_backView ybib_noVideoPlaying]) {
+            self.yb_hideToolViews(NO);
+        }
+    }
+}
+
+#pragma mark - <YBIBCellProtocol>
+
+@synthesize yb_currentOrientation = _yb_currentOrientation;
+@synthesize yb_containerSize = _yb_containerSize;
+@synthesize yb_backView = _yb_backView;
+@synthesize yb_collectionView = _yb_collectionView;
+@synthesize yb_isTransitioning = _yb_isTransitioning;
+@synthesize yb_auxiliaryViewHandler = _yb_auxiliaryViewHandler;
+@synthesize yb_hideStatusBar = _yb_hideStatusBar;
+@synthesize yb_hideBrowser = _yb_hideBrowser;
+@synthesize yb_hideToolViews = _yb_hideToolViews;
+@synthesize yb_cellData = _yb_cellData;
+@synthesize yb_currentPage = _yb_currentPage;
+@synthesize yb_selfPage = _yb_selfPage;
+@synthesize yb_cellIsInCenter = _yb_cellIsInCenter;
+@synthesize yb_isRotating = _yb_isRotating;
+
+- (void)setYb_cellData:(id<YBIBDataProtocol>)yb_cellData {
+    _yb_cellData = yb_cellData;
+    YBIBVideoData *data = (YBIBVideoData *)yb_cellData;
+    data.delegate = self;
+    
+    UIDeviceOrientation orientation = self.yb_currentOrientation();
+    CGSize containerSize = self.yb_containerSize(orientation);
+    [self.videoView updateLayoutWithExpectOrientation:orientation containerSize:containerSize];
+    self.videoView.autoPlayCount = data.autoPlayCount;
+    self.videoView.topBar.cancelButton.hidden = data.shouldHideForkButton;
+}
+
+- (void)yb_orientationWillChangeWithExpectOrientation:(UIDeviceOrientation)orientation {
+    if (_interacting) [self restoreGestureInteractionWithDuration:0];
+}
+
+- (void)yb_orientationChangeAnimationWithExpectOrientation:(UIDeviceOrientation)orientation {
+    [self updateImageLayoutWithOrientation:orientation previousImageSize:self.videoView.thumbImageView.image.size];
+    CGSize containerSize = self.yb_containerSize(orientation);
+    [self.videoView updateLayoutWithExpectOrientation:orientation containerSize:containerSize];
+}
+
+- (UIView *)yb_foregroundView {
+    return self.videoView.thumbImageView;
+}
+
+- (void)yb_pageChanged {
+    if (self.yb_currentPage() != self.yb_selfPage()) {
+        [self.videoView reset];
+        [self hideToolViews:NO];
+        [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+        if (_interacting) [self restoreGestureInteractionWithDuration:0];
+        self.videoView.needAutoPlay = NO;
+    } else {
+        self.videoView.needAutoPlay = YES;
+    }
+}
+
+#pragma mark - <YBIBVideoDataDelegate>
+
+- (void)yb_startLoadingAVAssetFromPHAssetForData:(YBIBVideoData *)data {}
+
+- (void)yb_finishLoadingAVAssetFromPHAssetForData:(YBIBVideoData *)data {}
+
+- (void)yb_startLoadingFirstFrameForData:(YBIBVideoData *)data {
+    if (!self.videoView.thumbImageView.image) {
+        [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self];
+    }
+}
+
+- (void)yb_finishLoadingFirstFrameForData:(YBIBVideoData *)data {
+    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+}
+
+- (void)yb_videoData:(YBIBVideoData *)data downloadingWithProgress:(CGFloat)progress {
+    [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self progress:progress];
+}
+
+- (void)yb_finishDownloadingForData:(YBIBVideoData *)data {
+    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+}
+
+- (void)yb_videoData:(YBIBVideoData *)data readyForAVAsset:(AVAsset *)asset {
+    self.videoView.asset = asset;
+}
+
+- (void)yb_videoData:(YBIBVideoData *)data readyForThumbImage:(UIImage *)image {
+    if (!self.videoView.isPlaying) {
+        self.videoView.thumbImageView.hidden = NO;
+    }
+    
+    if (!self.videoView.thumbImageView.image) {
+        CGSize previousSize = self.videoView.thumbImageView.image.size;
+        self.videoView.thumbImageView.image = image;
+        [self updateImageLayoutWithOrientation:self.yb_currentOrientation() previousImageSize:previousSize];
+    }
+}
+
+- (void)yb_videoIsInvalidForData:(YBIBVideoData *)data {
+    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+    NSString *imageIsInvalid = [YBIBCopywriter sharedCopywriter].videoIsInvalid;
+    if (self.videoView.thumbImageView.image) {
+        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self text:imageIsInvalid];
+    } else {
+        [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self text:imageIsInvalid];
+    }
+}
+
+#pragma mark - <YBIBVideoViewDelegate>
+
+- (BOOL)yb_isFreezingForVideoView:(YBIBVideoView *)view {
+    return self.yb_isTransitioning();
+}
+
+- (void)yb_preparePlayForVideoView:(YBIBVideoView *)view {
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.4 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        if (!view.isPlaying && !view.isPlayFailed && self.yb_selfPage() == self.yb_currentPage()) {
+            [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self];
+        }
+    });
+}
+
+- (void)yb_startPlayForVideoView:(YBIBVideoView *)view {
+    self.videoView.thumbImageView.hidden = YES;
+    [self.yb_backView ybib_videoPlayingAdd:self];
+    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+    [self hideToolViews:YES];
+}
+
+- (void)yb_didPlayToEndTimeForVideoView:(YBIBVideoView *)view {
+    YBIBVideoData *data = (YBIBVideoData *)self.yb_cellData;
+    if (data.repeatPlayCount == NSUIntegerMax) {
+        [view preparPlay];
+    } else if (data.repeatPlayCount > 0) {
+        --data.repeatPlayCount;
+        [view preparPlay];
+    } else {
+        [self hideToolViews:NO];
+    }
+}
+
+- (void)yb_finishPlayForVideoView:(YBIBVideoView *)view {
+    [self.yb_backView ybib_videoPlayingRemove:self];
+    [self hideToolViews:NO];
+}
+
+- (void)yb_playFailedForVideoView:(YBIBVideoView *)view {
+    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+    [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self text:YBIBCopywriter.sharedCopywriter.videoError];
+}
+
+- (void)yb_respondsToTapGestureForVideoView:(YBIBVideoView *)view {
+    if (self.yb_isRotating()) return;
+    
+    YBIBVideoData *data = self.yb_cellData;
+    if (data.singleTouchBlock) {
+        data.singleTouchBlock(data);
+    } else {
+        [self hideBrowser];
+    }
+}
+
+- (void)yb_cancelledForVideoView:(YBIBVideoView *)view {
+    if (self.yb_isRotating()) return;
+    
+    [self hideBrowser];
+}
+
+- (CGSize)yb_containerSizeForVideoView:(YBIBVideoView *)view {
+    return self.yb_containerSize(self.yb_currentOrientation());
+}
+
+- (void)yb_autoPlayCountChanged:(NSUInteger)count {
+    YBIBVideoData *data = (YBIBVideoData *)self.yb_cellData;
+    data.autoPlayCount = count;
+}
+
+#pragma mark - <UIGestureRecognizerDelegate>
+
+- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
+    return YES;
+}
+
+#pragma mark - gesture
+
+- (void)addGesture {
+    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(respondsToPanGesture:)];
+    panGesture.cancelsTouchesInView = NO;
+    panGesture.delegate = self;
+    [self.videoView.tapGesture requireGestureRecognizerToFail:panGesture];
+    [self.videoView addGestureRecognizer:panGesture];
+}
+
+- (void)respondsToPanGesture:(UIPanGestureRecognizer *)pan {
+    if (self.yb_isRotating()) return;
+    if ((!self.videoView.thumbImageView.image && !self.videoView.isPlaying)) return;
+    
+    YBIBInteractionProfile *profile = ((YBIBVideoData *)self.yb_cellData).interactionProfile;
+    if (profile.disable) return;
+    
+    CGPoint point = [pan locationInView:self];
+    CGSize containerSize = self.yb_containerSize(self.yb_currentOrientation());
+    
+    if (pan.state == UIGestureRecognizerStateBegan) {
+        _interactStartPoint = point;
+    } else if (pan.state == UIGestureRecognizerStateCancelled || pan.state == UIGestureRecognizerStateEnded || pan.state == UIGestureRecognizerStateRecognized || pan.state == UIGestureRecognizerStateFailed) {
+        
+        // End
+        if (_interacting) {
+            CGPoint velocity = [pan velocityInView:self.videoView];
+            
+            BOOL velocityArrive = ABS(velocity.y) > profile.dismissVelocityY;
+            BOOL distanceArrive = ABS(point.y - _interactStartPoint.y) > containerSize.height * profile.dismissScale;
+            
+            BOOL shouldDismiss = distanceArrive || velocityArrive;
+            if (shouldDismiss) {
+                [self hideBrowser];
+            } else {
+                [self restoreGestureInteractionWithDuration:profile.restoreDuration];
+            }
+        }
+        
+    } else if (pan.state == UIGestureRecognizerStateChanged) {
+        
+        if (_interacting) {
+            
+            // Change
+            self.videoView.center = point;
+            CGFloat scale = 1 - ABS(point.y - _interactStartPoint.y) / (containerSize.height * 1.2);
+            if (scale > 1) scale = 1;
+            if (scale < 0.35) scale = 0.35;
+            self.videoView.transform = CGAffineTransformMakeScale(scale, scale);
+            
+            CGFloat alpha = 1 - ABS(point.y - _interactStartPoint.y) / (containerSize.height * 0.7);
+            if (alpha > 1) alpha = 1;
+            if (alpha < 0) alpha = 0;
+            self.yb_backView.backgroundColor = [self.yb_backView.backgroundColor colorWithAlphaComponent:alpha];
+            
+        } else {
+            
+            // Start
+            if (CGPointEqualToPoint(_interactStartPoint, CGPointZero) || self.yb_currentPage() != self.yb_selfPage() || !self.yb_cellIsInCenter() || self.videoView.actionBar.isTouchInside) return;
+            
+            CGPoint velocityPoint = [pan velocityInView:self.videoView];
+            CGFloat triggerDistance = profile.triggerDistance;
+            
+            BOOL distanceArrive = ABS(point.y - _interactStartPoint.y) > triggerDistance && (ABS(point.x - _interactStartPoint.x) < triggerDistance && ABS(velocityPoint.x) < 500);
+            
+            BOOL shouldStart = distanceArrive;
+            if (!shouldStart) return;
+            
+            [self.videoView hideToolBar:YES];
+            
+            _interactStartPoint = point;
+            
+            CGRect startFrame = self.videoView.bounds;
+            CGFloat anchorX = (point.x - startFrame.origin.x) / startFrame.size.width,
+            anchorY = (point.y - startFrame.origin.y) / startFrame.size.height;
+            self.videoView.layer.anchorPoint = CGPointMake(anchorX, anchorY);
+            self.videoView.userInteractionEnabled = NO;
+            self.videoView.center = point;
+            
+            [self hideToolViews:YES];
+            self.yb_hideStatusBar(NO);
+            self.yb_collectionView().scrollEnabled = NO;
+            
+            _interacting = YES;
+        }
+    }
+}
+
+- (void)restoreGestureInteractionWithDuration:(NSTimeInterval)duration {
+    [self.videoView hideToolBar:NO];
+    
+    CGSize containerSize = self.yb_containerSize(self.yb_currentOrientation());
+    
+    void (^animations)(void) = ^{
+        self.yb_backView.backgroundColor = [self.yb_backView.backgroundColor colorWithAlphaComponent:1];
+        
+        CGPoint anchorPoint = self.videoView.layer.anchorPoint;
+        self.videoView.center = CGPointMake(containerSize.width * anchorPoint.x, containerSize.height * anchorPoint.y);
+        self.videoView.transform = CGAffineTransformIdentity;
+    };
+    void (^completion)(BOOL finished) = ^(BOOL finished){
+        self.videoView.layer.anchorPoint = CGPointMake(0.5, 0.5);
+        self.videoView.center = CGPointMake(containerSize.width * 0.5, containerSize.height * 0.5);
+        self.videoView.userInteractionEnabled = YES;
+        
+        self.yb_hideStatusBar(YES);
+        self.yb_collectionView().scrollEnabled = YES;
+        if (!self.videoView.isPlaying) [self hideToolViews:NO];;
+        
+        self->_interactStartPoint = CGPointZero;
+        self->_interacting = NO;
+    };
+    if (duration <= 0) {
+        animations();
+        completion(NO);
+    } else {
+        [UIView animateWithDuration:duration animations:animations completion:completion];
+    }
+}
+
+#pragma mark - getters & setters
+
+- (YBIBVideoView *)videoView {
+    if (!_videoView) {
+        _videoView = [YBIBVideoView new];
+        _videoView.delegate = self;
+    }
+    return _videoView;
+}
+
+@end

Pods/YBImageBrowser/Video/YBIBVideoData+Internal.h

@@ -0,0 +1,50 @@
+//
+//  YBIBVideoData+Internal.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/11.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBVideoData.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class YBIBVideoData;
+
+@protocol YBIBVideoDataDelegate <NSObject>
+@required
+
+- (void)yb_startLoadingAVAssetFromPHAssetForData:(YBIBVideoData *)data;
+
+- (void)yb_finishLoadingAVAssetFromPHAssetForData:(YBIBVideoData *)data;
+
+- (void)yb_startLoadingFirstFrameForData:(YBIBVideoData *)data;
+
+- (void)yb_finishLoadingFirstFrameForData:(YBIBVideoData *)data;
+
+- (void)yb_videoData:(YBIBVideoData *)data downloadingWithProgress:(CGFloat)progress;
+
+- (void)yb_finishDownloadingForData:(YBIBVideoData *)data;
+
+- (void)yb_videoData:(YBIBVideoData *)data readyForThumbImage:(UIImage *)image;
+
+- (void)yb_videoData:(YBIBVideoData *)data readyForAVAsset:(AVAsset *)asset;
+
+- (void)yb_videoIsInvalidForData:(YBIBVideoData *)data;
+
+@end
+
+@interface YBIBVideoData ()
+
+@property (nonatomic, assign, getter=isLoadingAVAssetFromPHAsset) BOOL loadingAVAssetFromPHAsset;
+
+@property (nonatomic, assign, getter=isLoadingFirstFrame) BOOL loadingFirstFrame;
+
+@property (nonatomic, assign, getter=isDownloading) BOOL downloading;
+
+@property (nonatomic, weak) id<YBIBVideoDataDelegate> delegate;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/Video/YBIBVideoData.h

@@ -0,0 +1,64 @@
+//
+//  YBIBVideoData.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/10.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <Photos/Photos.h>
+#import "YBIBDataProtocol.h"
+#import "YBIBInteractionProfile.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class YBIBVideoData;
+
+/// 单击事件的处理闭包
+typedef void (^YBIBVideoSingleTouchBlock)(YBIBVideoData *videoData);
+
+
+/**
+ 图片数据类，承担配置数据和处理数据的责任
+ */
+@interface YBIBVideoData : NSObject <YBIBDataProtocol>
+
+/// 视频 URL
+@property (nonatomic, copy, nullable) NSURL *videoURL;
+
+/// 相册视频资源
+@property (nonatomic, strong, nullable) PHAsset *videoPHAsset;
+
+/// 视频 AVAsset (通常使用 AVURLAsset)
+@property (nonatomic, strong, nullable) AVAsset *videoAVAsset;
+
+/// 投影视图，当前数据模型对应外界业务的 UIView (通常为 UIImageView)，做转场动效用
+@property (nonatomic, weak, nullable) __kindof UIView *projectiveView;
+
+/// 预览图/缩约图，若 projectiveView 存在且是 UIImageView 类型将会自动获取缩约图
+@property (nonatomic, strong, nullable) UIImage *thumbImage;
+
+/// 是否允许保存到相册
+@property (nonatomic, assign) BOOL allowSaveToPhotoAlbum;
+
+/// 自动播放次数，默认为 0，NSUIntegerMax 表示无限次
+@property (nonatomic, assign) NSUInteger autoPlayCount;
+
+/// 重复播放次数，默认为 0，NSUIntegerMax 表示无限次
+@property (nonatomic, assign) NSUInteger repeatPlayCount;
+
+/// 预留属性可随意使用
+@property (nonatomic, strong, nullable) id extraData;
+
+/// 手势交互动效配置文件
+@property (nonatomic, strong) YBIBInteractionProfile *interactionProfile;
+
+/// 单击的处理（视频未播放时），默认是退出图片浏览器
+@property (nonatomic, copy, nullable) YBIBVideoSingleTouchBlock singleTouchBlock;
+
+/// 是否要隐藏播放时的叉叉（取消）按钮
+@property (nonatomic, assign) BOOL shouldHideForkButton;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/Video/YBIBVideoData.m

@@ -0,0 +1,296 @@
+//
+//  YBIBVideoData.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/10.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBVideoData.h"
+#import "YBIBVideoCell.h"
+#import "YBIBVideoData+Internal.h"
+#import "YBIBUtilities.h"
+#import "YBIBPhotoAlbumManager.h"
+#import "YBIBCopywriter.h"
+
+extern CGImageRef YYCGImageCreateDecodedCopy(CGImageRef imageRef, BOOL decodeForDisplay);
+
+@interface YBIBVideoData () <NSURLSessionDelegate>
+@end
+
+@implementation YBIBVideoData {
+    NSURLSessionDownloadTask *_downloadTask;
+}
+
+#pragma mark - life cycle
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        [self initValue];
+    }
+    return self;
+}
+
+- (void)initValue {
+    _loadingFirstFrame = NO;
+    _loadingAVAssetFromPHAsset = NO;
+    _downloading = NO;
+    _interactionProfile = [YBIBInteractionProfile new];
+    _repeatPlayCount = 0;
+    _autoPlayCount = 0;
+    _shouldHideForkButton = NO;
+    _allowSaveToPhotoAlbum = YES;
+}
+
+#pragma mark - load data
+
+- (void)loadData {
+    // Always load 'thumbImage'.
+    [self loadThumbImage];
+    
+    if (self.videoAVAsset) {
+        [self.delegate yb_videoData:self readyForAVAsset:self.videoAVAsset];
+    } else if (self.videoPHAsset) {
+        [self loadAVAssetFromPHAsset];
+    } else {
+        [self.delegate yb_videoIsInvalidForData:self];
+    }
+}
+
+- (void)loadAVAssetFromPHAsset {
+    if (!self.videoPHAsset) return;
+    if (self.isLoadingAVAssetFromPHAsset) {
+        self.loadingAVAssetFromPHAsset = YES;
+        return;
+    }
+    
+    self.loadingAVAssetFromPHAsset = YES;
+    [YBIBPhotoAlbumManager getAVAssetWithPHAsset:self.videoPHAsset completion:^(AVAsset * _Nullable asset) {
+        YBIB_DISPATCH_ASYNC_MAIN(^{
+            self.loadingAVAssetFromPHAsset = NO;
+            
+            self.videoAVAsset = asset;
+            [self.delegate yb_videoData:self readyForAVAsset:self.videoAVAsset];
+            [self loadThumbImage];
+        })
+    }];
+}
+
+- (void)loadThumbImage {
+    if (self.thumbImage) {
+        [self.delegate yb_videoData:self readyForThumbImage:self.thumbImage];
+    } else if (self.projectiveView && [self.projectiveView isKindOfClass:UIImageView.self] && ((UIImageView *)self.projectiveView).image) {
+        self.thumbImage = ((UIImageView *)self.projectiveView).image;
+        [self.delegate yb_videoData:self readyForThumbImage:self.thumbImage];
+    } else {
+        [self loadThumbImage_firstFrame];
+    }
+}
+- (void)loadThumbImage_firstFrame {
+    if (!self.videoAVAsset) return;
+    if (self.isLoadingFirstFrame) {
+        self.loadingFirstFrame = YES;
+        return;
+    }
+    
+    self.loadingFirstFrame = YES;
+    CGSize containerSize = self.yb_containerSize(self.yb_currentOrientation());
+    CGSize maximumSize = containerSize;
+    
+    __weak typeof(self) wSelf = self;
+    YBIB_DISPATCH_ASYNC(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+        
+        AVAssetImageGenerator *generator = [AVAssetImageGenerator assetImageGeneratorWithAsset:self.videoAVAsset];
+        generator.appliesPreferredTrackTransform = YES;
+        generator.maximumSize = maximumSize;
+        NSError *error = nil;
+        CGImageRef cgImage = [generator copyCGImageAtTime:CMTimeMake(0, 1) actualTime:NULL error:&error];
+        CGImageRef decodedImage = YYCGImageCreateDecodedCopy(cgImage, YES);
+        UIImage *resultImage = [UIImage imageWithCGImage:decodedImage];
+        if (cgImage) CGImageRelease(cgImage);
+        if (decodedImage) CGImageRelease(decodedImage);
+        
+        YBIB_DISPATCH_ASYNC_MAIN(^{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            self.loadingFirstFrame = NO;
+            if (!error && resultImage) {
+                self.thumbImage = resultImage;
+                [self.delegate yb_videoData:self readyForThumbImage:self.thumbImage];
+            }
+        })
+    })
+}
+
+#pragma mark - <YBIBDataProtocol>
+
+@synthesize yb_currentOrientation = _yb_currentOrientation;
+@synthesize yb_containerView = _yb_containerView;
+@synthesize yb_containerSize = _yb_containerSize;
+@synthesize yb_isHideTransitioning = _yb_isHideTransitioning;
+@synthesize yb_auxiliaryViewHandler = _yb_auxiliaryViewHandler;
+
+- (nonnull Class)yb_classOfCell {
+    return YBIBVideoCell.self;
+}
+
+- (UIView *)yb_projectiveView {
+    return self.projectiveView;
+}
+
+- (CGRect)yb_imageViewFrameWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation {
+    if (containerSize.width <= 0 || containerSize.height <= 0 || imageSize.width <= 0 || imageSize.height <= 0) return CGRectZero;
+    CGFloat x = 0, y = 0, width = 0, height = 0;
+    if (imageSize.width / imageSize.height >= containerSize.width / containerSize.height) {
+        width = containerSize.width;
+        height = containerSize.width * (imageSize.height / imageSize.width);
+        x = 0;
+        y = (containerSize.height - height) / 2.0;
+    } else {
+        height = containerSize.height;
+        width = containerSize.height * (imageSize.width / imageSize.height);
+        x = (containerSize.width - width) / 2.0;
+        y = 0;
+    }
+    return CGRectMake(x, y, width, height);
+}
+
+- (void)yb_preload {
+    if (!self.delegate) {
+        [self loadData];
+    }
+}
+
+- (BOOL)yb_allowSaveToPhotoAlbum {
+    return self.allowSaveToPhotoAlbum;
+}
+
+- (void)yb_saveToPhotoAlbum {
+    void(^unableToSave)(void) = ^(){
+        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].unableToSave];
+    };
+    
+    if (self.videoAVAsset && [self.videoAVAsset isKindOfClass:AVURLAsset.class]) {
+        AVURLAsset *asset = (AVURLAsset *)self.videoAVAsset;
+        NSURL *URL = asset.URL;
+        if ([URL.scheme isEqualToString:@"file"]) {
+            NSString *path = URL.path;
+            if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(path)) {
+                UISaveVideoAtPathToSavedPhotosAlbum(path, self, @selector(UISaveVideoAtPathToSavedPhotosAlbum_videoPath:didFinishSavingWithError:contextInfo:), nil);
+            } else {
+                unableToSave();
+            }
+        } else if ([URL.scheme containsString:@"http"]) {
+            [self downloadWithURL:URL];
+        } else {
+            unableToSave();
+        }
+    } else {
+        unableToSave();
+    }
+}
+
+#pragma mark - private
+
+- (void)UISaveVideoAtPathToSavedPhotosAlbum_videoPath:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
+    if (error) {
+        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].saveToPhotoAlbumFailed];
+    } else {
+        [self.yb_auxiliaryViewHandler() yb_showCorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].saveToPhotoAlbumSuccess];
+    }
+}
+
+- (void)downloadWithURL:(NSURL *)URL {
+    if (self.isDownloading) {
+        self.downloading = YES;
+        return;
+    }
+    
+    self.downloading = YES;
+    NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
+    NSURLSession *session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:[NSOperationQueue mainQueue]];
+    _downloadTask = [session downloadTaskWithURL:URL];
+    [_downloadTask resume];
+}
+
+#pragma mark - <NSURLSessionDelegate>
+
+- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
+      didWriteData:(int64_t)bytesWritten
+ totalBytesWritten:(int64_t)totalBytesWritten
+totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite {
+    CGFloat progress = totalBytesWritten / (double)totalBytesExpectedToWrite;
+    if (progress < 0) progress = 0;
+    if (progress > 1) progress = 1;
+    [self.delegate yb_videoData:self downloadingWithProgress:progress];
+}
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
+didCompleteWithError:(nullable NSError *)error {
+    if (error) {
+        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].downloadFailed];
+    }
+    self.downloading = NO;
+}
+
+- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
+didFinishDownloadingToURL:(NSURL *)location {
+    NSString *cache = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
+    NSString *file = [cache stringByAppendingPathComponent:downloadTask.response.suggestedFilename];
+    [[NSFileManager defaultManager] moveItemAtURL:location toURL:[NSURL fileURLWithPath:file] error:nil];
+    if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(file)) {
+        UISaveVideoAtPathToSavedPhotosAlbum(file, self, @selector(UISaveVideoAtPathToSavedPhotosAlbum_videoPath:didFinishSavingWithError:contextInfo:), nil);
+    } else {
+        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].saveToPhotoAlbumFailed];
+    }
+    self.downloading = NO;
+}
+
+#pragma mark - getters & setters
+
+- (void)setVideoURL:(NSURL *)videoURL{
+    _videoURL = [videoURL isKindOfClass:NSString.class] ? [NSURL URLWithString:(NSString *)videoURL] : videoURL;
+    self.videoAVAsset = [AVURLAsset URLAssetWithURL:_videoURL options:nil];
+}
+
+- (void)setDownloading:(BOOL)downloading {
+    _downloading = downloading;
+    if (downloading) {
+        [self.delegate yb_videoData:self downloadingWithProgress:0];
+    } else {
+        [self.delegate yb_finishDownloadingForData:self];
+    }
+}
+
+- (void)setLoadingAVAssetFromPHAsset:(BOOL)loadingAVAssetFromPHAsset {
+    _loadingAVAssetFromPHAsset = loadingAVAssetFromPHAsset;
+    if (loadingAVAssetFromPHAsset) {
+        [self.delegate yb_startLoadingAVAssetFromPHAssetForData:self];
+    } else {
+        [self.delegate yb_finishLoadingAVAssetFromPHAssetForData:self];
+    }
+}
+
+- (void)setLoadingFirstFrame:(BOOL)loadingFirstFrame {
+    _loadingFirstFrame = loadingFirstFrame;
+    if (loadingFirstFrame) {
+        [self.delegate yb_startLoadingFirstFrameForData:self];
+    } else {
+        [self.delegate yb_finishLoadingFirstFrameForData:self];
+    }
+}
+
+@synthesize delegate = _delegate;
+- (void)setDelegate:(id<YBIBVideoDataDelegate>)delegate {
+    _delegate = delegate;
+    if (delegate) {
+        [self loadData];
+    }
+}
+- (id<YBIBVideoDataDelegate>)delegate {
+    // Stop sending data to the '_delegate' if it is transiting.
+    return self.yb_isHideTransitioning() ? nil : _delegate;
+}
+
+@end

Pods/YBImageBrowser/Video/YBIBVideoTopBar.h

@@ -0,0 +1,21 @@
+//
+//  YBIBVideoTopBar.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/11.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBVideoTopBar : UIView
+
+@property (nonatomic, strong, readonly) UIButton *cancelButton;
+
++ (CGFloat)defaultHeight;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/Video/YBIBVideoTopBar.m

@@ -0,0 +1,54 @@
+//
+//  YBIBVideoTopBar.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/11.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBVideoTopBar.h"
+#import "YBIBIconManager.h"
+
+@interface YBIBVideoTopBar ()
+@property (nonatomic, strong) UIButton *cancelButton;
+@end
+
+@implementation YBIBVideoTopBar
+
+#pragma mark - life cycle
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        [self addSubview:self.cancelButton];
+    }
+    return self;
+}
+
+- (void)layoutSubviews {
+    [super layoutSubviews];
+    CGFloat buttonWidth = 54;
+    self.cancelButton.frame = CGRectMake(0, 0, buttonWidth, self.bounds.size.height);
+}
+
+#pragma mark - public
+
++ (CGFloat)defaultHeight {
+    return 50;
+}
+
+#pragma mark - getter
+
+- (UIButton *)cancelButton {
+    if (!_cancelButton) {
+        _cancelButton = [UIButton buttonWithType:UIButtonTypeCustom];
+        [_cancelButton setImage:YBIBIconManager.sharedManager.videoCancelImage() forState:UIControlStateNormal];
+        _cancelButton.layer.shadowColor = UIColor.darkGrayColor.CGColor;
+        _cancelButton.layer.shadowOffset = CGSizeMake(0, 1);
+        _cancelButton.layer.shadowOpacity = 1;
+        _cancelButton.layer.shadowRadius = 4;
+    }
+    return _cancelButton;
+}
+
+@end

Pods/YBImageBrowser/Video/YBIBVideoView.h

@@ -0,0 +1,76 @@
+//
+//  YBIBVideoView.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/11.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBVideoActionBar.h"
+#import "YBIBVideoTopBar.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class YBIBVideoView;
+
+@protocol YBIBVideoViewDelegate <NSObject>
+@required
+
+- (BOOL)yb_isFreezingForVideoView:(YBIBVideoView *)view;
+
+- (void)yb_preparePlayForVideoView:(YBIBVideoView *)view;
+
+- (void)yb_startPlayForVideoView:(YBIBVideoView *)view;
+
+- (void)yb_finishPlayForVideoView:(YBIBVideoView *)view;
+
+- (void)yb_didPlayToEndTimeForVideoView:(YBIBVideoView *)view;
+
+- (void)yb_playFailedForVideoView:(YBIBVideoView *)view;
+
+- (void)yb_respondsToTapGestureForVideoView:(YBIBVideoView *)view;
+
+- (void)yb_cancelledForVideoView:(YBIBVideoView *)view;
+
+- (CGSize)yb_containerSizeForVideoView:(YBIBVideoView *)view;
+
+- (void)yb_autoPlayCountChanged:(NSUInteger)count;
+
+@end
+
+@interface YBIBVideoView : UIView
+
+@property (nonatomic, strong) UIImageView *thumbImageView;
+
+@property (nonatomic, weak) id<YBIBVideoViewDelegate> delegate;
+
+- (void)updateLayoutWithExpectOrientation:(UIDeviceOrientation)orientation containerSize:(CGSize)containerSize;
+
+@property (nonatomic, strong, nullable) AVAsset *asset;
+
+@property (nonatomic, assign, readonly, getter=isPlaying) BOOL playing;
+
+@property (nonatomic, assign, readonly, getter=isPlayFailed) BOOL playFailed;
+
+@property (nonatomic, assign, readonly, getter=isPreparingPlay) BOOL preparingPlay;
+
+@property (nonatomic, strong, readonly) UITapGestureRecognizer *tapGesture;
+
+- (void)reset;
+
+- (void)hideToolBar:(BOOL)hide;
+
+- (void)hidePlayButton;
+
+- (void)preparPlay;
+
+@property (nonatomic, assign) BOOL needAutoPlay;
+
+@property (nonatomic, assign) NSUInteger autoPlayCount;
+
+@property (nonatomic, strong, readonly) YBIBVideoTopBar *topBar;
+@property (nonatomic, strong, readonly) YBIBVideoActionBar *actionBar;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/Video/YBIBVideoView.m

@@ -0,0 +1,394 @@
+//
+//  YBIBVideoView.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/11.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <AVFoundation/AVFoundation.h>
+#import "YBIBVideoView.h"
+#import "YBIBVideoActionBar.h"
+#import "YBIBVideoTopBar.h"
+#import "YBIBUtilities.h"
+#import "YBIBIconManager.h"
+
+@interface YBIBVideoView () <YBIBVideoActionBarDelegate>
+@property (nonatomic, strong) YBIBVideoTopBar *topBar;
+@property (nonatomic, strong) YBIBVideoActionBar *actionBar;
+@property (nonatomic, strong) UIButton *playButton;
+@end
+
+@implementation YBIBVideoView {
+    AVPlayer *_player;
+    AVPlayerItem *_playerItem;
+    AVPlayerLayer *_playerLayer;
+    BOOL _active;
+}
+
+#pragma mark - life cycle
+
+- (void)dealloc {
+    [self removeObserverForSystem];
+    [self reset];
+}
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        [self initValue];
+        self.backgroundColor = UIColor.clearColor;
+        
+        [self addSubview:self.thumbImageView];
+        [self addSubview:self.topBar];
+        [self addSubview:self.actionBar];
+        [self addSubview:self.playButton];
+        [self addObserverForSystem];
+        
+        _tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(respondsToTapGesture:)];
+        [self addGestureRecognizer:_tapGesture];
+    }
+    return self;
+}
+
+- (void)initValue {
+    _playing = NO;
+    _active = YES;
+    _needAutoPlay = NO;
+    _autoPlayCount = 0;
+    _playFailed = NO;
+    _preparingPlay = NO;
+}
+
+#pragma mark - public
+
+- (void)updateLayoutWithExpectOrientation:(UIDeviceOrientation)orientation containerSize:(CGSize)containerSize {
+    UIEdgeInsets padding = YBIBPaddingByBrowserOrientation(orientation);
+    CGFloat width = containerSize.width - padding.left - padding.right, height = containerSize.height;
+    self.topBar.frame = CGRectMake(padding.left, padding.top, width, [YBIBVideoTopBar defaultHeight]);
+    self.actionBar.frame = CGRectMake(padding.left, height - [YBIBVideoActionBar defaultHeight] - padding.bottom - 10, width, [YBIBVideoActionBar defaultHeight]);
+    self.playButton.center = CGPointMake(containerSize.width / 2.0, containerSize.height / 2.0);
+    _playerLayer.frame = (CGRect){CGPointZero, containerSize};
+}
+
+- (void)reset {
+    [self removeObserverForPlayer];
+    
+    // If set '_playerLayer.player = nil' or '_player = nil', can not cancel observeing of 'addPeriodicTimeObserverForInterval'.
+    [_player pause];
+    _playerItem = nil;
+    [_playerLayer removeFromSuperlayer];
+    _playerLayer = nil;
+
+    [self finishPlay];
+}
+
+- (void)hideToolBar:(BOOL)hide {
+    if (hide) {
+        self.actionBar.hidden = YES;
+        self.topBar.hidden = YES;
+    } else if (self.isPlaying) {
+        self.actionBar.hidden = NO;
+        self.topBar.hidden = NO;
+    }
+}
+
+- (void)hidePlayButton {
+    self.playButton.hidden = YES;
+}
+
+#pragma mark - private
+
+- (void)videoJumpWithScale:(float)scale {
+    CMTime startTime = CMTimeMakeWithSeconds(scale, _player.currentTime.timescale);
+    AVPlayer *tmpPlayer = _player;
+    
+    if (CMTIME_IS_INDEFINITE(startTime) || CMTIME_IS_INVALID(startTime)) return;
+    [_player seekToTime:startTime toleranceBefore:CMTimeMake(1, 1000) toleranceAfter:CMTimeMake(1, 1000) completionHandler:^(BOOL finished) {
+        if (finished && tmpPlayer == self->_player) {
+            [self startPlay];
+        }
+    }];
+}
+
+- (void)preparPlay {
+    _preparingPlay = YES;
+    _playFailed = NO;
+    
+    self.playButton.hidden = YES;
+    
+    [self.delegate yb_preparePlayForVideoView:self];
+    
+    if (!_playerLayer) {
+        _playerItem = [AVPlayerItem playerItemWithAsset:self.asset];
+        _player = [AVPlayer playerWithPlayerItem:_playerItem];
+        
+        _playerLayer = [AVPlayerLayer playerLayerWithPlayer:_player];
+        _playerLayer.frame = (CGRect){CGPointZero, [self.delegate yb_containerSizeForVideoView:self]};
+        [self.layer insertSublayer:_playerLayer above:self.thumbImageView.layer];
+        
+        [self addObserverForPlayer];
+    } else {
+        [self videoJumpWithScale:0];
+    }
+}
+
+- (void)startPlay {
+    if (_player) {
+        _playing = YES;
+        
+        [_player play];
+        [self.actionBar play];
+        
+        self.topBar.hidden = NO;
+        self.actionBar.hidden = NO;
+        
+        [self.delegate yb_startPlayForVideoView:self];
+    }
+}
+
+- (void)finishPlay {
+    self.playButton.hidden = NO;
+    [self.actionBar setCurrentValue:0];
+    self.actionBar.hidden = YES;
+    self.topBar.hidden = YES;
+    
+    _playing = NO;
+    
+    [self.delegate yb_finishPlayForVideoView:self];
+}
+
+- (void)playerPause {
+    if (_player) {
+        [_player pause];
+        [self.actionBar pause];
+    }
+}
+
+- (BOOL)autoPlay {
+    if (self.autoPlayCount == NSUIntegerMax) {
+        [self preparPlay];
+    } else if (self.autoPlayCount > 0) {
+        --self.autoPlayCount;
+        [self.delegate yb_autoPlayCountChanged:self.autoPlayCount];
+        [self preparPlay];
+    } else {
+        return NO;
+    }
+    return YES;
+}
+
+#pragma mark - <YBIBVideoActionBarDelegate>
+
+- (void)yb_videoActionBar:(YBIBVideoActionBar *)actionBar clickPlayButton:(UIButton *)playButton {
+    [self startPlay];
+}
+
+- (void)yb_videoActionBar:(YBIBVideoActionBar *)actionBar clickPauseButton:(UIButton *)pauseButton {
+    [self playerPause];
+}
+
+- (void)yb_videoActionBar:(YBIBVideoActionBar *)actionBar changeValue:(float)value {
+    [self videoJumpWithScale:value];
+}
+
+#pragma mark - observe
+
+- (void)addObserverForPlayer {
+    [_playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
+    __weak typeof(self) wSelf = self;
+    [_player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {
+        __strong typeof(wSelf) self = wSelf;
+        if (!self) return;
+        float currentTime = time.value / time.timescale;
+        [self.actionBar setCurrentValue:currentTime];
+    }];
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didPlayToEndTime:) name:AVPlayerItemDidPlayToEndTimeNotification object:_playerItem];
+}
+
+- (void)removeObserverForPlayer {
+    [_playerItem removeObserver:self forKeyPath:@"status"];
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:_playerItem];
+}
+
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{
+    if (![self.delegate yb_isFreezingForVideoView:self]) {
+        if (object == _playerItem) {
+            if ([keyPath isEqualToString:@"status"]) {
+                [self playerItemStatusChanged];
+            }
+        }
+    }
+}
+
+- (void)didPlayToEndTime:(NSNotification *)noti {
+    if (noti.object == _playerItem) {
+        [self finishPlay];
+        [self.delegate yb_didPlayToEndTimeForVideoView:self];
+    }
+}
+
+- (void)playerItemStatusChanged {
+    if (!_active) return;
+    
+    _preparingPlay = NO;
+    
+    switch (_playerItem.status) {
+        case AVPlayerItemStatusReadyToPlay: {
+            // Delay to update UI.
+            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.15 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+                [self startPlay];
+                double max = CMTimeGetSeconds(self->_playerItem.duration);
+                [self.actionBar setMaxValue:(isnan(max) || isinf(max)) ? 0 : max];
+            });
+        }
+            break;
+        case AVPlayerItemStatusUnknown: {
+            _playFailed = YES;
+            [self.delegate yb_playFailedForVideoView:self];
+            [self reset];
+        }
+            break;
+        case AVPlayerItemStatusFailed: {
+            _playFailed = YES;
+            [self.delegate yb_playFailedForVideoView:self];
+            [self reset];
+        }
+            break;
+    }
+}
+
+- (void)removeObserverForSystem {
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillResignActiveNotification object:nil];
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidBecomeActiveNotification object:nil];
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidChangeStatusBarFrameNotification object:nil];
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:AVAudioSessionRouteChangeNotification object:nil];
+}
+
+- (void)addObserverForSystem {
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillResignActive:) name:UIApplicationWillResignActiveNotification object:nil];
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidBecomeActive:) name:UIApplicationDidBecomeActiveNotification object:nil];
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didChangeStatusBarFrame) name:UIApplicationDidChangeStatusBarFrameNotification object:nil];
+    [[AVAudioSession sharedInstance] setActive:YES error:nil];
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(audioRouteChangeListenerCallback:)   name:AVAudioSessionRouteChangeNotification object:nil];
+}
+
+- (void)applicationWillResignActive:(NSNotification *)notification {
+    _active = NO;
+    [self playerPause];
+}
+
+- (void)applicationDidBecomeActive:(NSNotification *)notification {
+    _active = YES;
+}
+
+- (void)didChangeStatusBarFrame {
+    if ([UIApplication sharedApplication].statusBarFrame.size.height > YBIBStatusbarHeight()) {
+        [self playerPause];
+    }
+}
+
+- (void)audioRouteChangeListenerCallback:(NSNotification*)notification {
+    YBIB_DISPATCH_ASYNC_MAIN(^{
+        NSDictionary *interuptionDict = notification.userInfo;
+        NSInteger routeChangeReason = [[interuptionDict valueForKey:AVAudioSessionRouteChangeReasonKey] integerValue];
+        switch (routeChangeReason) {
+            case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:
+                [self playerPause];
+                break;
+        }
+    })
+}
+
+#pragma mark - event
+
+- (void)respondsToTapGesture:(UITapGestureRecognizer *)tap {
+    if (self.isPlaying) {
+        self.actionBar.hidden = !self.actionBar.isHidden;
+        self.topBar.hidden = !self.topBar.isHidden;
+    } else {
+        [self.delegate yb_respondsToTapGestureForVideoView:self];
+    }
+}
+
+- (void)clickCancelButton:(UIButton *)button {
+    [self.delegate yb_cancelledForVideoView:self];
+}
+
+- (void)clickPlayButton:(UIButton *)button {
+    [self preparPlay];
+}
+
+#pragma mark - getters & setters
+
+- (void)setNeedAutoPlay:(BOOL)needAutoPlay {
+    if (needAutoPlay && _asset && !self.isPlaying) {
+        [self autoPlay];
+    } else {
+        _needAutoPlay = needAutoPlay;
+    }
+}
+
+@synthesize asset = _asset;
+- (void)setAsset:(AVAsset *)asset {
+    _asset = asset;
+    if (!asset) return;
+    if (self.needAutoPlay) {
+        if (![self autoPlay]) {
+            self.playButton.hidden = NO;
+        }
+        self.needAutoPlay = NO;
+    } else {
+        self.playButton.hidden = NO;
+    }
+}
+- (AVAsset *)asset {
+    if ([_asset isKindOfClass:AVURLAsset.class]) {
+        _asset = [AVURLAsset assetWithURL:((AVURLAsset *)_asset).URL];
+    }
+    return _asset;
+}
+
+- (YBIBVideoTopBar *)topBar {
+    if (!_topBar) {
+        _topBar = [YBIBVideoTopBar new];
+        [_topBar.cancelButton addTarget:self action:@selector(clickCancelButton:) forControlEvents:UIControlEventTouchUpInside];
+        _topBar.hidden = YES;
+    }
+    return _topBar;
+}
+
+- (YBIBVideoActionBar *)actionBar {
+    if (!_actionBar) {
+        _actionBar = [YBIBVideoActionBar new];
+        _actionBar.delegate = self;
+        _actionBar.hidden = YES;
+    }
+    return _actionBar;
+}
+
+- (UIButton *)playButton {
+    if (!_playButton) {
+        _playButton = [UIButton buttonWithType:UIButtonTypeCustom];
+        _playButton.bounds = CGRectMake(0, 0, 100, 100);
+        [_playButton setImage:YBIBIconManager.sharedManager.videoBigPlayImage() forState:UIControlStateNormal];
+        [_playButton addTarget:self action:@selector(clickPlayButton:) forControlEvents:UIControlEventTouchUpInside];
+        _playButton.hidden = YES;
+        _playButton.layer.shadowColor = UIColor.darkGrayColor.CGColor;
+        _playButton.layer.shadowOffset = CGSizeMake(0, 1);
+        _playButton.layer.shadowOpacity = 1;
+        _playButton.layer.shadowRadius = 4;
+    }
+    return _playButton;
+}
+
+- (UIImageView *)thumbImageView {
+    if (!_thumbImageView) {
+        _thumbImageView = [UIImageView new];
+        _thumbImageView.contentMode = UIViewContentModeScaleAspectFit;
+        _thumbImageView.layer.masksToBounds = YES;
+    }
+    return _thumbImageView;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/AuxiliaryView/YBIBAuxiliaryViewHandler.h

@@ -0,0 +1,39 @@
+//
+//  YBIBAuxiliaryViewHandler.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/27.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol YBIBAuxiliaryViewHandler <NSObject>
+
+@required
+
+/// 展示正确情况的提示
+- (void)yb_showCorrectToastWithContainer:(UIView *)container text:(NSString *)text;
+/// 展示错误情况的提示
+- (void)yb_showIncorrectToastWithContainer:(UIView *)container text:(NSString *)text;
+/// 隐藏所有提示
+- (void)yb_hideToastWithContainer:(UIView *)container;
+
+/// 展示加载视图
+- (void)yb_showLoadingWithContainer:(UIView *)container;
+/// 展示带进度的加载视图
+- (void)yb_showLoadingWithContainer:(UIView *)container progress:(CGFloat)progress;
+/// 展示带文字的视图
+- (void)yb_showLoadingWithContainer:(UIView *)container text:(NSString *)text;
+/// 隐藏所有视图
+- (void)yb_hideLoadingWithContainer:(UIView *)container;
+
+@end
+
+@interface YBIBAuxiliaryViewHandler : NSObject <YBIBAuxiliaryViewHandler>
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/AuxiliaryView/YBIBAuxiliaryViewHandler.m

@@ -0,0 +1,45 @@
+//
+//  YBIBAuxiliaryViewHandler.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/27.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBAuxiliaryViewHandler.h"
+#import "YBIBToastView.h"
+#import "YBIBLoadingView.h"
+
+@implementation YBIBAuxiliaryViewHandler
+
+#pragma mark - <YBIBAuxiliaryViewHandler>
+
+- (void)yb_showCorrectToastWithContainer:(UIView *)container text:(NSString *)text {
+    [container ybib_showHookToast:text];
+}
+
+- (void)yb_showIncorrectToastWithContainer:(UIView *)container text:(NSString *)text {
+    [container ybib_showForkToast:text];
+}
+
+- (void)yb_hideToastWithContainer:(UIView *)container {
+    [container ybib_hideToast];
+}
+
+- (void)yb_showLoadingWithContainer:(UIView *)container {
+    [container ybib_showLoading];
+}
+
+- (void)yb_showLoadingWithContainer:(UIView *)container progress:(CGFloat)progress {
+    [container ybib_showLoadingWithProgress:progress];
+}
+
+- (void)yb_showLoadingWithContainer:(UIView *)container text:(NSString *)text {
+    [container ybib_showLoadingWithText:text click:nil];
+}
+
+- (void)yb_hideLoadingWithContainer:(UIView *)container {
+    [container ybib_hideLoading];
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/AuxiliaryView/YBIBLoadingView.h

@@ -0,0 +1,36 @@
+//
+//  YBIBLoadingView.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2018/9/1.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface UIView (YBIBLoading)
+
+- (void)ybib_showLoading;
+
+- (void)ybib_showLoadingWithProgress:(CGFloat)progress;
+
+- (void)ybib_showLoadingWithText:(NSString *)text click:(nullable void(^)(void))click;
+
+- (void)ybib_hideLoading;
+
+@end
+
+
+@interface YBIBLoadingView : UIView
+
+- (void)show;
+
+- (void)showProgress:(CGFloat)progress;
+
+- (void)showText:(NSString *)text click:(void(^)(void))click;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/AuxiliaryView/YBIBLoadingView.m

@@ -0,0 +1,258 @@
+//
+//  YBIBLoadingView.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2018/9/1.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import "YBIBLoadingView.h"
+#import "YBIBIconManager.h"
+#import <objc/runtime.h>
+
+@interface UIView ()
+@property (nonatomic, strong, readonly) YBIBLoadingView *ybib_loading;
+@end
+
+@implementation UIView (YBIBLoading)
+
+- (void)ybib_showLoadingWithProgress:(CGFloat)progress {
+    [self ybib_addLoadingView];
+    [self.ybib_loading showProgress:progress];
+}
+
+- (void)ybib_showLoading {
+    [self ybib_addLoadingView];
+    [self.ybib_loading show];
+}
+
+- (void)ybib_showLoadingWithText:(NSString *)text click:(void (^)(void))click {
+    [self ybib_addLoadingView];
+    [self.ybib_loading showText:text click:click];
+}
+
+- (void)ybib_addLoadingView {
+    YBIBLoadingView *loading = self.ybib_loading;
+    if (!loading.superview) {
+        [self addSubview:loading];
+        loading.translatesAutoresizingMaskIntoConstraints = NO;
+        NSLayoutConstraint *layA = [NSLayoutConstraint constraintWithItem:loading attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeft multiplier:1 constant:0];
+        NSLayoutConstraint *layB = [NSLayoutConstraint constraintWithItem:loading attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeRight multiplier:1 constant:0];
+        NSLayoutConstraint *layC = [NSLayoutConstraint constraintWithItem:loading attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeBottom multiplier:1 constant:0];
+        NSLayoutConstraint *layD = [NSLayoutConstraint constraintWithItem:loading attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTop multiplier:1 constant:0];
+        [self addConstraints:@[layA, layB, layC, layD]];
+    }
+}
+
+- (void)ybib_hideLoading {
+    YBIBLoadingView *loading = self.ybib_loading;
+    if (loading && loading.superview) {
+        [loading removeFromSuperview];
+    }
+}
+
+static void *YBIBLoadingKey = &YBIBLoadingKey;
+- (void)setYbib_loading:(YBIBLoadingView *)ybib_loading {
+    objc_setAssociatedObject(self, YBIBLoadingKey, ybib_loading, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+- (YBIBLoadingView *)ybib_loading {
+    YBIBLoadingView *loading = objc_getAssociatedObject(self, YBIBLoadingKey);
+    if (!loading) {
+        loading = [YBIBLoadingView new];
+        self.ybib_loading = loading;
+    }
+    return loading;
+}
+
+@end
+
+
+@interface YBIBProgressDrawView : UIView
+@property (nonatomic, assign) CGFloat progress;
+@end
+@implementation YBIBProgressDrawView
+- (void)drawRect:(CGRect)rect {
+    if (self.isHidden) return;
+    
+    CGFloat progress = (isnan(_progress) || isinf(_progress) || _progress < 0) ? 0 : _progress;
+    
+    CGFloat radius = 17;
+    CGFloat strokeWidth = 3;
+    CGPoint center = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
+    
+    [[UIColor lightGrayColor] setStroke];
+    UIBezierPath *bottomPath = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:0 endAngle:M_PI * 2 clockwise:YES];
+    bottomPath.lineWidth = 4.0;
+    bottomPath.lineCapStyle = kCGLineCapRound;
+    bottomPath.lineJoinStyle = kCGLineCapRound;
+    [bottomPath stroke];
+    
+    [[UIColor whiteColor] setStroke];
+    UIBezierPath *activePath = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:-M_PI / 2.0 endAngle:M_PI * 2 * progress - M_PI / 2.0 clockwise:true];
+    activePath.lineWidth = strokeWidth;
+    activePath.lineCapStyle = kCGLineCapRound;
+    activePath.lineJoinStyle = kCGLineCapRound;
+    [activePath stroke];
+    
+    NSShadow *shadow = [NSShadow new];
+    shadow.shadowBlurRadius = 4;
+    shadow.shadowOffset = CGSizeMake(0, 1);
+    shadow.shadowColor = UIColor.darkGrayColor;
+    NSString *string = [NSString stringWithFormat:@"%.0lf%@", progress * 100, @"%"];
+    NSMutableAttributedString *atts = [[NSMutableAttributedString alloc] initWithString:string attributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:10], NSForegroundColorAttributeName:[UIColor whiteColor], NSShadowAttributeName:shadow}];
+    CGSize size = atts.size;
+    [atts drawAtPoint:CGPointMake(center.x - size.width / 2.0, center.y - size.height / 2.0)];
+}
+@end
+
+
+typedef NS_ENUM(NSUInteger, YBImageBrowserProgressType) {
+    YBImageBrowserProgressTypeProgress,
+    YBImageBrowserProgressTypeLoad,
+    YBImageBrowserProgressTypeText
+};
+
+@interface YBIBLoadingView () {
+    YBImageBrowserProgressType  _type;
+}
+@property (nonatomic, strong) UILabel *textLabel;
+@property (nonatomic, strong) UIImageView *imageView;
+@property (nonatomic, strong) YBIBProgressDrawView *drawView;
+@property (nonatomic, copy) void(^clickTextLabelBlock)(void);
+@end
+
+@implementation YBIBLoadingView
+
+#pragma mark life cycle
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0];
+        self.userInteractionEnabled = NO;
+        
+        [self addSubview:self.drawView];
+        [self addSubview:self.textLabel];
+        [self addSubview:self.imageView];
+    }
+    return self;
+}
+
+- (void)updateConstraints {
+    self.textLabel.translatesAutoresizingMaskIntoConstraints = NO;
+    NSLayoutConstraint *layA = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeft multiplier:1 constant:20];
+    NSLayoutConstraint *layB = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeRight multiplier:1 constant:-20];
+    NSLayoutConstraint *layC = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
+    
+    self.imageView.translatesAutoresizingMaskIntoConstraints = NO;
+    NSLayoutConstraint *layE = [NSLayoutConstraint constraintWithItem:self.imageView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];
+    NSLayoutConstraint *layF = [NSLayoutConstraint constraintWithItem:self.imageView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
+    
+    self.drawView.translatesAutoresizingMaskIntoConstraints = NO;
+    NSLayoutConstraint *layG = [NSLayoutConstraint constraintWithItem:self.drawView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];
+    NSLayoutConstraint *layH = [NSLayoutConstraint constraintWithItem:self.drawView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
+    NSLayoutConstraint *layI = [NSLayoutConstraint constraintWithItem:self.drawView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:50];
+    NSLayoutConstraint *layJ = [NSLayoutConstraint constraintWithItem:self.drawView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:50];
+    
+    [self addConstraints:@[layA, layB, layC, layE, layF, layG, layH, layI, layJ]];
+    [super updateConstraints];
+}
+
+#pragma mark public
+
+- (void)showProgress:(CGFloat)progress {
+    self.userInteractionEnabled = NO;
+    _type = YBImageBrowserProgressTypeProgress;
+    self.drawView.hidden = NO;
+    self.textLabel.hidden = YES;
+    self.imageView.hidden = YES;
+    [self stopImageViewAnimation];
+    
+    self.drawView.progress = progress;
+    [self.drawView setNeedsDisplay];
+}
+
+- (void)show {
+    self.userInteractionEnabled = NO;
+    _type = YBImageBrowserProgressTypeLoad;
+    self.drawView.hidden = YES;
+    self.textLabel.hidden = YES;
+    self.imageView.hidden = NO;
+    
+    [self startImageViewAnimation];
+    [self.drawView setNeedsDisplay];
+}
+
+- (void)startImageViewAnimation {
+    CABasicAnimation *ra = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
+    ra.toValue = [NSNumber numberWithFloat:M_PI * 2];
+    ra.duration = 1;
+    ra.cumulative = YES;
+    ra.repeatCount = HUGE_VALF;
+    ra.removedOnCompletion = NO;
+    ra.fillMode = kCAFillModeForwards;
+    [self.imageView.layer addAnimation:ra forKey:@"ra"];
+}
+
+- (void)stopImageViewAnimation {
+    [self.imageView.layer removeAllAnimations];
+}
+
+- (void)showText:(NSString *)text click:(void (^)(void))click {
+    self.userInteractionEnabled = click ? YES : NO;
+    _type = YBImageBrowserProgressTypeText;
+    self.drawView.hidden = YES;
+    self.textLabel.hidden = NO;
+    self.imageView.hidden = YES;
+    [self stopImageViewAnimation];
+    
+    self.textLabel.text = text;
+    self.clickTextLabelBlock = click;
+    [self.drawView setNeedsDisplay];
+}
+
+#pragma mark - touch event
+
+- (void)respondsToTapTextlabel {
+    if (self.clickTextLabelBlock) {
+        self.clickTextLabelBlock();
+    }
+}
+
+#pragma mark - getter
+
+- (YBIBProgressDrawView *)drawView {
+    if (!_drawView) {
+        _drawView = [YBIBProgressDrawView new];
+        _drawView.backgroundColor = [UIColor clearColor];
+    }
+    return _drawView;
+}
+
+- (UILabel *)textLabel {
+    if (!_textLabel) {
+        _textLabel = [UILabel new];
+        _textLabel.textColor = [UIColor whiteColor];
+        _textLabel.numberOfLines = 0;
+        _textLabel.font = [UIFont systemFontOfSize:14];
+        _textLabel.textAlignment = NSTextAlignmentCenter;
+        UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(respondsToTapTextlabel)];
+        [_textLabel addGestureRecognizer:tapGesture];
+        _textLabel.userInteractionEnabled = YES;
+    }
+    return _textLabel;
+}
+
+- (UIImageView *)imageView {
+    if (!_imageView) {
+        _imageView = [UIImageView new];
+        _imageView.image = [YBIBIconManager sharedManager].loadingImage();
+        _imageView.layer.shadowColor = UIColor.darkGrayColor.CGColor;
+        _imageView.layer.shadowOffset = CGSizeMake(0, 1);
+        _imageView.layer.shadowOpacity = 1;
+        _imageView.layer.shadowRadius = 4;
+    }
+    return _imageView;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/AuxiliaryView/YBIBToastView.h

@@ -0,0 +1,36 @@
+//
+//  YBIBToastView.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/20.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface UIView (YBIBToast)
+
+- (void)ybib_showHookToast:(NSString *)text;
+
+- (void)ybib_showForkToast:(NSString *)text;
+
+- (void)ybib_hideToast;
+
+@end
+
+
+typedef NS_ENUM(NSInteger, YBIBToastType) {
+    YBIBToastTypeNone,
+    YBIBToastTypeHook,
+    YBIBToastTypeFork
+};
+
+@interface YBIBToastView : UIView
+
+- (void)showWithText:(NSString *)text type:(YBIBToastType)type;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/AuxiliaryView/YBIBToastView.m

@@ -0,0 +1,179 @@
+//
+//  YBIBToastView.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/20.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBToastView.h"
+#import <objc/runtime.h>
+
+@interface UIView ()
+@property (nonatomic, strong, readonly) YBIBToastView *ybib_toast;
+@end
+
+@implementation UIView (YBIBToast)
+
+- (void)ybib_showHookToast:(NSString *)text {
+    [self ybib_showToastWithText:text type:YBIBToastTypeHook hideAfterDelay:1.7];
+}
+
+- (void)ybib_showForkToast:(NSString *)text {
+    [self ybib_showToastWithText:text type:YBIBToastTypeFork hideAfterDelay:1.7];
+}
+
+- (void)ybib_showToastWithText:(NSString *)text type:(YBIBToastType)type hideAfterDelay:(NSTimeInterval)delay {
+    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(ybib_hideToast) object:nil];
+    
+    YBIBToastView *toast = self.ybib_toast;
+    if (!toast.superview) {
+        [self addSubview:toast];
+        toast.translatesAutoresizingMaskIntoConstraints = NO;
+        NSLayoutConstraint *layA = [NSLayoutConstraint constraintWithItem:toast attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];
+        NSLayoutConstraint *layB = [NSLayoutConstraint constraintWithItem:toast attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
+        NSLayoutConstraint *layC = [NSLayoutConstraint constraintWithItem:toast attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:self attribute:NSLayoutAttributeLeft multiplier:1 constant:40];
+        NSLayoutConstraint *layD = [NSLayoutConstraint constraintWithItem:toast attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationLessThanOrEqual toItem:self attribute:NSLayoutAttributeRight multiplier:1 constant:-40];
+        [self addConstraints:@[layA, layB, layC, layD]];
+    }
+    
+    [toast showWithText:text type:type];
+    [self performSelector:@selector(ybib_hideToast) withObject:nil afterDelay:delay];
+}
+
+- (void)ybib_hideToast {
+    YBIBToastView *toast = self.ybib_toast;
+    if (toast && toast.superview) {
+        [UIView animateWithDuration:0.25 animations:^{
+            toast.alpha = 0;
+        } completion:^(BOOL finished) {
+            [toast removeFromSuperview];
+            toast.alpha = 1;
+        }];
+    }
+}
+
+static void *YBIBToastKey = &YBIBToastKey;
+- (void)setYbib_toast:(YBIBToastView *)ybib_toast {
+    objc_setAssociatedObject(self, YBIBToastKey, ybib_toast, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+- (YBIBToastView *)ybib_toast {
+    YBIBToastView *toast = objc_getAssociatedObject(self, YBIBToastKey);
+    if (!toast) {
+        toast = [YBIBToastView new];
+        self.ybib_toast = toast;
+    }
+    return toast;
+}
+
+@end
+
+
+@interface YBIBToastView () {
+    YBIBToastType _type;
+    CAShapeLayer *_shapeLayer;
+}
+@property (nonatomic, strong) UILabel *textLabel;
+@end
+
+@implementation YBIBToastView
+
+#pragma mark - life cycle
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.8];
+        self.userInteractionEnabled = NO;
+        self.layer.cornerRadius = 7;
+        
+        [self addSubview:self.textLabel];
+    }
+    return self;
+}
+
+- (void)updateConstraints {
+    self.textLabel.translatesAutoresizingMaskIntoConstraints = NO;
+    NSLayoutConstraint *layA = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeft multiplier:1 constant:20];
+    NSLayoutConstraint *layB = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeRight multiplier:1 constant:-20];
+    NSLayoutConstraint *layC = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeBottom multiplier:1 constant:-15];
+    NSLayoutConstraint *layD = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTop multiplier:1 constant:70];
+    NSLayoutConstraint *layE = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:60];
+    [self addConstraints:@[layA, layB, layC, layD, layE]];
+    [super updateConstraints];
+}
+
+- (void)layoutSubviews {
+    [super layoutSubviews];
+    [self startAnimation];
+}
+
+#pragma mark - animation
+
+- (void)showWithText:(NSString *)text type:(YBIBToastType)type {
+    self.textLabel.text = text;
+    _type = type;
+    [self setNeedsLayout];
+}
+
+- (void)startAnimation {
+    if (_shapeLayer && _shapeLayer.superlayer) {
+        [_shapeLayer removeFromSuperlayer];
+    }
+    _shapeLayer = [CAShapeLayer layer];
+    _shapeLayer.strokeColor = [UIColor whiteColor].CGColor;
+    _shapeLayer.fillColor = [UIColor clearColor].CGColor;
+    _shapeLayer.lineWidth = 5.0;
+    _shapeLayer.lineCap = @"round";
+    _shapeLayer.lineJoin = @"round";
+    _shapeLayer.strokeStart = 0.0;
+    _shapeLayer.strokeEnd = 0.0;
+    
+    UIBezierPath *bezierPath = [UIBezierPath bezierPath];
+    CGFloat r = 13.0;
+    CGFloat x = self.bounds.size.width / 2.0;
+    CGFloat y = 38.0;
+    switch (_type) {
+        case YBIBToastTypeHook: {
+            [bezierPath moveToPoint:CGPointMake(x - r - r / 2, y)];
+            [bezierPath addLineToPoint:CGPointMake(x - r / 2, y + r)];
+            [bezierPath addLineToPoint:CGPointMake(x + r * 2 - r / 2, y - r)];
+        }
+            break;
+        case YBIBToastTypeFork: {
+            [bezierPath moveToPoint:CGPointMake(x - r, y - r)];
+            [bezierPath addLineToPoint:CGPointMake(x + r, y + r)];
+            [bezierPath moveToPoint:CGPointMake(x - r, y + r)];
+            [bezierPath addLineToPoint:CGPointMake(x + r, y - r)];
+        }
+            break;
+        default:break;
+    }
+    
+    CABasicAnimation *baseAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
+    [baseAnimation setFromValue:@0.0];
+    [baseAnimation setToValue:@1.0];
+    [baseAnimation setDuration:0.3];
+    baseAnimation.removedOnCompletion = NO;
+    baseAnimation.fillMode = kCAFillModeBoth;
+    
+    _shapeLayer.path = bezierPath.CGPath;
+    [self.layer addSublayer:_shapeLayer];
+    [_shapeLayer addAnimation:baseAnimation forKey:@"strokeEnd"];
+}
+
+#pragma mark - getter
+
+- (UILabel *)textLabel {
+    if (!_textLabel) {
+        _textLabel = [UILabel new];
+        _textLabel.textColor = [UIColor whiteColor];
+        _textLabel.font = [UIFont systemFontOfSize:14];
+        _textLabel.textAlignment = NSTextAlignmentCenter;
+        _textLabel.numberOfLines = 0;
+    }
+    return _textLabel;
+}
+
+@end
+

Pods/YBImageBrowser/YBImageBrowser/Base/NSObject+YBImageBrowser.h

@@ -0,0 +1,19 @@
+//
+//  NSObject+YBImageBrowser.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/9/26.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface NSObject (YBImageBrowser)
+
+@property (nonatomic, assign) CGFloat ybib_originAlpha;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Base/NSObject+YBImageBrowser.m

@@ -0,0 +1,23 @@
+//
+//  NSObject+YBImageBrowser.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/9/26.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "NSObject+YBImageBrowser.h"
+#import <objc/runtime.h>
+
+@implementation NSObject (YBImageBrowser)
+
+static void *YBIBOriginAlphaKey = &YBIBOriginAlphaKey;
+- (void)setYbib_originAlpha:(CGFloat)ybib_originAlpha {
+    objc_setAssociatedObject(self, YBIBOriginAlphaKey, @(ybib_originAlpha), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+- (CGFloat)ybib_originAlpha {
+    NSNumber *alpha = objc_getAssociatedObject(self, YBIBOriginAlphaKey);
+    return alpha ? alpha.floatValue : 1;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBAnimatedTransition.h

@@ -0,0 +1,46 @@
+//
+//  YBIBAnimatedTransition.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/6.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol YBIBAnimatedTransition <NSObject>
+@required
+
+- (void)yb_showTransitioningWithContainer:(UIView *)container startView:(nullable __kindof UIView *)startView startImage:(nullable UIImage *)startImage endFrame:(CGRect)endFrame orientation:(UIDeviceOrientation)orientation completion:(void(^)(void))completion;
+
+- (void)yb_hideTransitioningWithContainer:(UIView *)container startView:(nullable __kindof UIView *)startView endView:(UIView *)endView orientation:(UIDeviceOrientation)orientation completion:(void(^)(void))completion;
+
+@end
+
+
+typedef NS_ENUM(NSInteger, YBIBTransitionType) {
+    /// 无动效
+    YBIBTransitionTypeNone,
+    /// 渐隐
+    YBIBTransitionTypeFade,
+    /// 连贯移动
+    YBIBTransitionTypeCoherent
+};
+
+@interface YBIBAnimatedTransition : NSObject <YBIBAnimatedTransition>
+
+/// 入场动效类型
+@property (nonatomic, assign) YBIBTransitionType showType;
+/// 出场动效类型
+@property (nonatomic, assign) YBIBTransitionType hideType;
+
+/// 入场动效持续时间
+@property (nonatomic, assign) NSTimeInterval showDuration;
+/// 出场动效持续时间
+@property (nonatomic, assign) NSTimeInterval hideDuration;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBAnimatedTransition.m

@@ -0,0 +1,175 @@
+//
+//  YBIBAnimatedTransition.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/6.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBAnimatedTransition.h"
+
+extern CGFloat YBIBRotationAngle(UIDeviceOrientation startOrientation, UIDeviceOrientation endOrientation);
+
+@implementation YBIBAnimatedTransition
+
+#pragma mark - life cycle
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _showType = _hideType = YBIBTransitionTypeCoherent;
+        _showDuration = _hideDuration = 0.25;
+    }
+    return self;
+}
+
+#pragma mark - <YBIBAnimationHandler>
+
+- (void)yb_showTransitioningWithContainer:(UIView *)container startView:(__kindof UIView *)startView startImage:(UIImage *)startImage endFrame:(CGRect)endFrame orientation:(UIDeviceOrientation)orientation completion:(void (^)(void))completion {
+    YBIBTransitionType type = self.showType;
+    if (type == YBIBTransitionTypeCoherent) {
+        if (CGRectIsEmpty(endFrame) || !startView || orientation != (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation) {
+            type = YBIBTransitionTypeFade;
+        }
+    }
+    
+    switch (type) {
+        case YBIBTransitionTypeNone: {
+            completion();
+        }
+            break;
+        case YBIBTransitionTypeFade: {
+            
+            BOOL animateValid = !CGRectIsEmpty(endFrame) && startView;
+            
+            UIImageView *animateImageView;
+            if (animateValid) {
+                animateImageView = [self imageViewAssimilateToView:startView];
+                animateImageView.frame = endFrame;
+                animateImageView.image = startImage;
+                [container addSubview:animateImageView];
+            }
+            
+            CGFloat rawAlpha = container.alpha;
+            container.alpha = 0;
+            
+            if (!animateValid) completion();
+                
+            [UIView animateWithDuration:self.showDuration animations:^{
+                container.alpha = rawAlpha;
+            } completion:^(BOOL finished) {
+                if (animateValid) {
+                    [animateImageView removeFromSuperview];
+                    completion();
+                }
+            }];
+            
+        }
+            break;
+        case YBIBTransitionTypeCoherent: {
+            
+            UIImageView *animateImageView = [self imageViewAssimilateToView:startView];
+            animateImageView.frame = [startView convertRect:startView.bounds toView:container];
+            animateImageView.image = startImage;
+            
+            [container addSubview:animateImageView];
+            
+            UIColor *rawBackgroundColor = container.backgroundColor;
+            container.backgroundColor = [rawBackgroundColor colorWithAlphaComponent:0];
+            
+            [UIView animateWithDuration:self.showDuration animations:^{
+                animateImageView.frame = endFrame;
+                container.backgroundColor = rawBackgroundColor;
+            } completion:^(BOOL finished) {
+                completion();
+                // Disappear smoothly.
+                [UIView animateWithDuration:0.2 animations:^{
+                    animateImageView.alpha = 0;
+                } completion:^(BOOL finished) {
+                    [animateImageView removeFromSuperview];
+                }];
+            }];
+            
+        }
+            break;
+    }
+}
+
+- (void)yb_hideTransitioningWithContainer:(UIView *)container startView:(__kindof UIView *)startView endView:(UIView *)endView orientation:(UIDeviceOrientation)orientation completion:(void (^)(void))completion {
+    YBIBTransitionType type = self.hideType;
+    if (type == YBIBTransitionTypeCoherent && (!startView || !endView)) {
+        type = YBIBTransitionTypeFade;
+    }
+    
+    switch (type) {
+        case YBIBTransitionTypeNone: {
+            completion();
+        }
+            break;
+        case YBIBTransitionTypeFade: {
+            
+            CGFloat rawAlpha = container.alpha;
+            
+            [UIView animateWithDuration:self.hideDuration animations:^{
+                container.alpha = 0;
+            } completion:^(BOOL finished) {
+                completion();
+                container.alpha = rawAlpha;
+            }];
+            
+        }
+            break;
+        case YBIBTransitionTypeCoherent: {
+            
+            CGRect startFrame = startView.frame;
+            CGRect endFrame = [endView convertRect:endView.bounds toView:startView.superview];
+            
+            UIColor *rawBackgroundColor = container.backgroundColor;
+            
+            [UIView animateWithDuration:self.hideDuration animations:^{
+                
+                container.backgroundColor = [rawBackgroundColor colorWithAlphaComponent:0];
+                
+                startView.contentMode = endView.contentMode;
+                
+                CGAffineTransform transform = startView.transform;
+                UIDeviceOrientation statusBarOrientation = (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation;
+                if (orientation != statusBarOrientation) {
+                    transform = CGAffineTransformRotate(transform, YBIBRotationAngle(orientation, statusBarOrientation));
+                }
+                
+                if ([startView isKindOfClass:UIImageView.self]) {
+                    startView.frame = endFrame;
+                    startView.transform = transform;
+                } else {
+                    CGFloat scale = MAX(endFrame.size.width / startFrame.size.width, endFrame.size.height / startFrame.size.height);
+                    startView.center = CGPointMake(endFrame.size.width * startView.layer.anchorPoint.x + endFrame.origin.x, endFrame.size.height * startView.layer.anchorPoint.y + endFrame.origin.y);
+                    startView.transform = CGAffineTransformScale(transform, scale, scale);
+                }
+                
+            } completion:^(BOOL finished) {
+                completion();
+                container.backgroundColor = rawBackgroundColor;
+            }];
+            
+        }
+            break;
+    }
+}
+
+#pragma mark - private
+
+- (UIImageView *)imageViewAssimilateToView:(nullable __kindof UIView *)view {
+    UIImageView *animateImageView = [UIImageView new];
+    if ([view isKindOfClass:UIImageView.self]) {
+        animateImageView.contentMode = view.contentMode;
+    } else {
+        animateImageView.contentMode = UIViewContentModeScaleAspectFill;
+    }
+    animateImageView.layer.masksToBounds = view.layer.masksToBounds;
+    animateImageView.layer.cornerRadius = view.layer.cornerRadius;
+    animateImageView.layer.backgroundColor = view.layer.backgroundColor;
+    return animateImageView;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBCollectionView.h

@@ -0,0 +1,25 @@
+//
+//  YBIBCollectionView.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/6.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBCollectionViewLayout.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBCollectionView : UICollectionView
+
+@property (nonatomic, strong, readonly) YBIBCollectionViewLayout *layout;
+
+- (NSString *)reuseIdentifierForCellClass:(Class)cellClass;
+
+- (nullable UICollectionViewCell *)centerCell;
+
+- (void)scrollToPage:(NSInteger)page;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBCollectionView.m

@@ -0,0 +1,83 @@
+//
+//  YBIBCollectionView.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/6.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBCollectionView.h"
+
+@implementation YBIBCollectionView {
+    NSMutableSet *_reuseSet;
+}
+
+#pragma mark - life cycle
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    _layout = [YBIBCollectionViewLayout new];
+    return [self initWithFrame:frame collectionViewLayout:_layout];
+}
+
+- (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(nonnull UICollectionViewLayout *)layout {
+    self = [super initWithFrame:frame collectionViewLayout:layout];
+    if (self) {
+        self.backgroundColor = [UIColor clearColor];
+        self.pagingEnabled = YES;
+        self.showsHorizontalScrollIndicator = NO;
+        self.showsVerticalScrollIndicator = NO;
+        self.alwaysBounceVertical = NO;
+        self.alwaysBounceHorizontal = NO;
+        self.decelerationRate = UIScrollViewDecelerationRateFast;
+        if (@available(iOS 11.0, *)) {
+            self.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
+        }
+        _reuseSet = [NSMutableSet set];
+    }
+    return self;
+}
+
+#pragma mark - public
+
+- (NSString *)reuseIdentifierForCellClass:(Class)cellClass {
+    NSString *identifier = NSStringFromClass(cellClass);
+    if (![_reuseSet containsObject:identifier]) {
+        NSString *path = [[NSBundle mainBundle] pathForResource:identifier ofType:@"nib"];
+        if (path) {
+            [self registerNib:[UINib nibWithNibName:identifier bundle:nil] forCellWithReuseIdentifier:identifier];
+        } else {
+            [self registerClass:cellClass forCellWithReuseIdentifier:identifier];
+        }
+        [_reuseSet addObject:identifier];
+    }
+    return identifier;
+}
+
+- (UICollectionViewCell *)centerCell {
+    NSArray<UICollectionViewCell *> *cells = [self visibleCells];
+    if (cells.count == 0) return nil;
+    
+    UICollectionViewCell *res = cells[0];
+    CGFloat centerX = self.contentOffset.x + (self.bounds.size.width / 2.0);
+    for (int i = 1; i < cells.count; ++i) {
+        if (ABS(cells[i].center.x - centerX) < ABS(res.center.x - centerX)) {
+            res = cells[i];
+        }
+    }
+    return res;
+}
+
+- (void)scrollToPage:(NSInteger)page {
+    [self setContentOffset:CGPointMake(self.bounds.size.width * page, 0)];
+}
+
+#pragma mark - hit test
+
+- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
+    UIView *view = [super hitTest:point withEvent:event];
+    // When the hit-test view is 'UISlider', set '_scrollEnabled' to 'NO', avoid gesture conflicts.
+    self.scrollEnabled = ![view isKindOfClass:UISlider.class];
+    return view;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBCollectionViewLayout.h

@@ -0,0 +1,16 @@
+//
+//  YBIBCollectionViewLayout.h
+//  YBImageBrowserDemo
+//
+//  Created by 杨少 on 2018/4/17.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface YBIBCollectionViewLayout : UICollectionViewFlowLayout
+
+@property (nonatomic, assign) CGFloat distanceBetweenPages;
+
+@end
+

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBCollectionViewLayout.m

@@ -0,0 +1,44 @@
+//
+//  YBIBCollectionViewLayout.m
+//  YBImageBrowserDemo
+//
+//  Created by 杨少 on 2018/4/17.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import "YBIBCollectionViewLayout.h"
+
+@implementation YBIBCollectionViewLayout
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        self.minimumLineSpacing = 0;
+        self.minimumInteritemSpacing = 0;
+        self.sectionInset = UIEdgeInsetsZero;
+        self.scrollDirection = UICollectionViewScrollDirectionHorizontal;
+        _distanceBetweenPages = 20;
+    }
+    return self;
+}
+
+- (void)prepareLayout {
+    [super prepareLayout];
+    self.itemSize = self.collectionView.bounds.size;
+}
+
+- (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect {
+    NSArray<UICollectionViewLayoutAttributes *> *layoutAttsArray = [[NSArray alloc] initWithArray:[super layoutAttributesForElementsInRect:rect] copyItems:YES];
+    CGFloat halfWidth = self.collectionView.bounds.size.width / 2.0;
+    CGFloat centerX = self.collectionView.contentOffset.x + halfWidth;
+    [layoutAttsArray enumerateObjectsUsingBlock:^(UICollectionViewLayoutAttributes * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
+        obj.center = CGPointMake(obj.center.x + (obj.center.x - centerX) / halfWidth * self.distanceBetweenPages / 2, obj.center.y);
+    }];
+    return layoutAttsArray;
+}
+
+- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds {
+    return YES;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBContainerView.h

@@ -0,0 +1,17 @@
+//
+//  YBIBContainerView.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/11.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBContainerView : UIView
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBContainerView.m

@@ -0,0 +1,22 @@
+//
+//  YBIBContainerView.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/11.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBContainerView.h"
+
+@implementation YBIBContainerView
+
+- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
+    UIView *originView = [super hitTest:point withEvent:event];
+    if ([originView isKindOfClass:self.class]) {
+        // Continue hit-testing if the view is kind of 'self.class'.
+        return nil;
+    }
+    return originView;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBDataMediator.h

@@ -0,0 +1,31 @@
+//
+//  YBIBDataMediator.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/6.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBImageBrowser.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBDataMediator : NSObject
+
+- (instancetype)initWithBrowser:(YBImageBrowser *)browser;
+
+@property (nonatomic, assign) NSUInteger dataCacheCountLimit;
+
+- (NSInteger)numberOfCells;
+
+- (id<YBIBDataProtocol>)dataForCellAtIndex:(NSInteger)index;
+
+- (void)clear;
+
+@property (nonatomic, assign) NSUInteger preloadCount;
+
+- (void)preloadWithPage:(NSInteger)page;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBDataMediator.m

@@ -0,0 +1,69 @@
+//
+//  YBIBDataMediator.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/6.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBDataMediator.h"
+#import "YBImageBrowser+Internal.h"
+
+@implementation YBIBDataMediator {
+    __weak YBImageBrowser *_browser;
+    NSCache<NSNumber *, id<YBIBDataProtocol>> *_dataCache;
+}
+
+#pragma mark - life cycle
+
+- (instancetype)initWithBrowser:(YBImageBrowser *)browser {
+    if (self = [super init]) {
+        _browser = browser;
+        _dataCache = [NSCache new];
+    }
+    return self;
+}
+
+#pragma mark - public
+
+- (NSInteger)numberOfCells {
+    return _browser.dataSource ? [_browser.dataSource yb_numberOfCellsInImageBrowser:_browser] : _browser.dataSourceArray.count;
+}
+
+- (id<YBIBDataProtocol>)dataForCellAtIndex:(NSInteger)index {
+    if (index < 0 || index > self.numberOfCells - 1) return nil;
+    
+    id<YBIBDataProtocol> data = [_dataCache objectForKey:@(index)];
+    if (!data) {
+        data = _browser.dataSource ? [_browser.dataSource yb_imageBrowser:_browser dataForCellAtIndex:index] : _browser.dataSourceArray[index];
+        [_dataCache setObject:data forKey:@(index)];
+        [_browser implementGetBaseInfoProtocol:data];
+    }
+    return data;
+}
+
+- (void)clear {
+    [_dataCache removeAllObjects];
+}
+
+- (void)preloadWithPage:(NSInteger)page {
+    if (_preloadCount == 0) return;
+    
+    NSInteger left = -(_preloadCount / 2), right = _preloadCount - ABS(left);
+    for (NSInteger i = left; i <= right; ++i) {
+        if (i == 0) continue;
+        id<YBIBDataProtocol> targetData = [self dataForCellAtIndex:page + i];
+        if ([targetData respondsToSelector:@selector(yb_preload)]) {
+            [targetData yb_preload];
+        }
+    }
+}
+
+#pragma mark - getters & setters
+
+- (void)setDataCacheCountLimit:(NSUInteger)dataCacheCountLimit {
+    _dataCacheCountLimit = dataCacheCountLimit;
+    _dataCache.countLimit = dataCacheCountLimit;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBScreenRotationHandler.h

@@ -0,0 +1,37 @@
+//
+//  YBIBScreenRotationHandler.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/8.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBImageBrowser.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBScreenRotationHandler : NSObject
+
+- (instancetype)initWithBrowser:(YBImageBrowser *)browser;
+
+- (void)startObserveStatusBarOrientation;
+
+- (void)startObserveDeviceOrientation;
+
+- (void)clear;
+
+- (void)configContainerSize:(CGSize)size;
+
+- (CGSize)containerSizeWithOrientation:(UIDeviceOrientation)orientation;
+
+@property (nonatomic, assign, readonly, getter=isRotating) BOOL rotating;
+
+@property (nonatomic, assign, readonly) UIDeviceOrientation currentOrientation;
+
+@property (nonatomic, assign) UIInterfaceOrientationMask supportedOrientations;
+
+@property (nonatomic, assign) NSTimeInterval rotationDuration;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Base/YBIBScreenRotationHandler.m

@@ -0,0 +1,328 @@
+//
+//  YBIBScreenRotationHandler.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/8.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBScreenRotationHandler.h"
+#import "YBIBUtilities.h"
+#import "YBIBCellProtocol.h"
+#import "YBImageBrowser+Internal.h"
+
+BOOL YBIBValidDeviceOrientation(UIDeviceOrientation orientation) {
+    static NSSet *validSet;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        validSet = [NSSet setWithObjects:@(UIDeviceOrientationPortrait), @(UIDeviceOrientationPortraitUpsideDown), @(UIDeviceOrientationLandscapeLeft), @(UIDeviceOrientationLandscapeRight), nil];
+    });
+    return [validSet containsObject:@(orientation)];
+}
+
+CGFloat YBIBRotationAngle(UIDeviceOrientation startOrientation, UIDeviceOrientation endOrientation) {
+    static NSDictionary<NSNumber*, NSNumber*> *angleMap;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        angleMap = @{@(UIDeviceOrientationPortrait):@(0), @(UIDeviceOrientationPortraitUpsideDown):@(M_PI), @(UIDeviceOrientationLandscapeLeft):@(M_PI_2), @(UIDeviceOrientationLandscapeRight): @(-M_PI_2)};
+    });
+    NSNumber *start = angleMap[@(startOrientation)], *end = angleMap[@(endOrientation)];
+    CGFloat res = CGFLOAT_IS_DOUBLE ? end.doubleValue - start.doubleValue : end.floatValue - start.floatValue;
+    if (ABS(res) > M_PI) {
+        return res > 0 ? res - M_PI * 2 : M_PI * 2 + res;
+    }
+    return res;
+}
+
+
+static NSUInteger const kMaskNull = 10000;
+
+@interface YBIBScreenRotationHandler ()
+@property (nonatomic, assign) BOOL rotating;
+@property (nonatomic, assign) UIDeviceOrientation currentOrientation;
+@end
+
+@implementation YBIBScreenRotationHandler {
+    __weak YBImageBrowser *_browser;
+    CGSize _verticalContainerSize;
+    CGSize _horizontalContainerSize;
+    NSInteger _recordPage;
+}
+
+#pragma mark - life cycle
+
+- (void)dealloc {
+    [self clear];
+}
+
+- (instancetype)initWithBrowser:(YBImageBrowser *)browser {
+    if (self = [super init]) {
+        _browser = browser;
+        _rotating = NO;
+        _supportedOrientations = UIInterfaceOrientationMaskAllButUpsideDown;
+        _rotationDuration = 0.25;
+    }
+    return self;
+}
+
+#pragma mark - public
+
+- (void)startObserveStatusBarOrientation {
+    self.currentOrientation = (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation;
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidChangedStatusBarOrientationNotification:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillChangeStatusBarOrientationNotification:) name:UIApplicationWillChangeStatusBarOrientationNotification object:nil];
+}
+
+- (void)startObserveDeviceOrientation {
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationDidChangeNotification:) name:UIDeviceOrientationDidChangeNotification object:nil];
+}
+
+- (void)clear {
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+}
+
+- (void)configContainerSize:(CGSize)size {
+    if (UIDeviceOrientationIsLandscape(self.currentOrientation)) {
+        // Now is horizontal.
+        _verticalContainerSize = CGSizeMake(size.height, size.width);
+        _horizontalContainerSize = size;
+    } else {
+        // Now is vertical.
+        _verticalContainerSize = size;
+        _horizontalContainerSize = CGSizeMake(size.height, size.width);
+    }
+}
+
+- (CGSize)containerSizeWithOrientation:(UIDeviceOrientation)orientation {
+    return UIDeviceOrientationIsLandscape(orientation) ? _horizontalContainerSize : _verticalContainerSize;
+}
+
+#pragma mark - private
+
+- (BOOL)supportedOfOrientation:(UIDeviceOrientation)orientation {
+    if (!YBIBValidDeviceOrientation(orientation)) return NO;
+    NSMutableSet *set = [NSMutableSet set];
+    if (_supportedOrientations & UIInterfaceOrientationMaskPortrait) [set addObject:@(UIDeviceOrientationPortrait)];
+    if (_supportedOrientations & UIInterfaceOrientationMaskPortraitUpsideDown) [set addObject:@(UIDeviceOrientationPortraitUpsideDown)];
+    if (_supportedOrientations & UIInterfaceOrientationMaskLandscapeRight) [set addObject:@(UIDeviceOrientationLandscapeLeft)];
+    if (_supportedOrientations & UIInterfaceOrientationMaskLandscapeLeft) [set addObject:@(UIDeviceOrientationLandscapeRight)];
+    return [set containsObject:@(orientation)];
+}
+
+- (BOOL)supportedOnlyOneSystemOrientation {
+    UIInterfaceOrientationMask mask = [self supportSystemOrientationMask];
+    return mask == (mask & (-mask));
+}
+
+- (void)orientationWillChangeWithExpectOrientation:(UIDeviceOrientation)orientation centerCell:(UICollectionViewCell<YBIBCellProtocol> *)centerCell {
+    if ([centerCell respondsToSelector:@selector(yb_orientationWillChangeWithExpectOrientation:)]) {
+        [centerCell yb_orientationWillChangeWithExpectOrientation:orientation];
+    }
+    for (id<YBIBToolViewHandler> handler in _browser.toolViewHandlers) {
+        if ([handler respondsToSelector:@selector(yb_orientationWillChangeWithExpectOrientation:)]) {
+            [handler yb_orientationWillChangeWithExpectOrientation:orientation];
+        }
+    }
+}
+
+- (void)orientationChangeAnimationWithExpectOrientation:(UIDeviceOrientation)orientation centerCell:(UICollectionViewCell<YBIBCellProtocol> *)centerCell {
+    if ([centerCell respondsToSelector:@selector(yb_orientationChangeAnimationWithExpectOrientation:)]) {
+        [centerCell yb_orientationChangeAnimationWithExpectOrientation:orientation];
+        [centerCell layoutIfNeeded];    // Compatible with autolayout.
+    }
+    for (id<YBIBToolViewHandler> handler in _browser.toolViewHandlers) {
+        if ([handler respondsToSelector:@selector(yb_orientationChangeAnimationWithExpectOrientation:)]) {
+            [handler yb_orientationChangeAnimationWithExpectOrientation:orientation];
+        }
+    }
+}
+
+- (void)orientationDidChangedWithOrientation:(UIDeviceOrientation)orientation centerCell:(UICollectionViewCell<YBIBCellProtocol> *)centerCell {
+    if ([centerCell respondsToSelector:@selector(yb_orientationDidChangedWithOrientation:)]) {
+        [centerCell yb_orientationDidChangedWithOrientation:orientation];
+    }
+    for (id<YBIBToolViewHandler> handler in _browser.toolViewHandlers) {
+        if ([handler respondsToSelector:@selector(yb_orientationDidChangedWithOrientation:)]) {
+            [handler yb_orientationDidChangedWithOrientation:orientation];
+        }
+    }
+}
+
+#pragma mark - event
+
+- (void)deviceOrientationDidChangeNotification:(NSNotification *)note {
+    if (![self supportedOnlyOneSystemOrientation]) return;
+    if (_browser.isTransitioning || self.rotating) return;
+    
+    UIDeviceOrientation expectOrientation = [UIDevice currentDevice].orientation;
+    if (expectOrientation == self.currentOrientation || ![self supportedOfOrientation:expectOrientation]) return;
+    
+    self.rotating = YES;
+    
+    // Align.
+    [_browser.collectionView scrollToPage:_browser.currentPage];
+    // Record current page number before transforming.
+    NSInteger currentPage = _browser.currentPage;
+    
+    UIDeviceOrientation statusBarOrientation = (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation;
+    CGFloat angleStatusBarToExpect = YBIBRotationAngle(statusBarOrientation, expectOrientation);
+    CGFloat angleCurrentToExpect = YBIBRotationAngle(_currentOrientation, expectOrientation);
+    CGRect expectBounds = (CGRect){CGPointZero, [self containerSizeWithOrientation:expectOrientation]};
+    UICollectionViewCell<YBIBCellProtocol> *centerCell = (UICollectionViewCell<YBIBCellProtocol> *)self->_browser.collectionView.centerCell;
+    // Animate smoothly if bigger rotation angle.
+    NSTimeInterval duration = self.rotationDuration * (ABS(angleCurrentToExpect) > M_PI_2 ? 2 : 1);
+
+    // 'collectionView' transformation.
+    self->_browser.collectionView.bounds = expectBounds;
+    self->_browser.collectionView.transform = CGAffineTransformMakeRotation(angleStatusBarToExpect);
+    centerCell.contentView.transform = CGAffineTransformMakeRotation(-angleCurrentToExpect);
+    
+    // Reset to prevent the page number change after transforming.
+    [self->_browser.collectionView scrollToPage:currentPage];
+    
+    [self orientationWillChangeWithExpectOrientation:expectOrientation centerCell:centerCell];
+    
+    [UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
+        
+        // Maybe the internal UI need to transform.
+        [self orientationChangeAnimationWithExpectOrientation:expectOrientation centerCell:centerCell];
+        
+        centerCell.contentView.bounds = expectBounds;
+        centerCell.contentView.transform = CGAffineTransformIdentity;
+        
+        self->_browser.containerView.bounds = expectBounds;
+        self->_browser.containerView.transform = CGAffineTransformMakeRotation(angleStatusBarToExpect);
+        
+    } completion:^(BOOL finished) {
+        self.currentOrientation = expectOrientation;
+        self.rotating = NO;
+        
+        [self orientationDidChangedWithOrientation:expectOrientation centerCell:centerCell];
+    }];
+}
+
+- (void)applicationWillChangeStatusBarOrientationNotification:(NSNotification *)noti {
+    if ([self supportedOnlyOneSystemOrientation]) return;
+    
+    self.rotating = YES;
+    // Record current page number before transforming.
+    _recordPage = _browser.currentPage;
+    
+    UICollectionViewCell<YBIBCellProtocol> *centerCell = (UICollectionViewCell<YBIBCellProtocol> *)self->_browser.collectionView.centerCell;
+    UIDeviceOrientation expectOrientation = ((NSNumber *)noti.userInfo[UIApplicationStatusBarOrientationUserInfoKey]).integerValue;
+    [self orientationWillChangeWithExpectOrientation:expectOrientation centerCell:centerCell];
+}
+
+- (void)applicationDidChangedStatusBarOrientationNotification:(NSNotification *)noti {
+    if ([self supportedOnlyOneSystemOrientation]) return;
+    
+    UIDeviceOrientation expectOrientation = (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation;
+    UICollectionViewCell<YBIBCellProtocol> *centerCell = (UICollectionViewCell<YBIBCellProtocol> *)self->_browser.collectionView.centerCell;
+    
+    [self orientationChangeAnimationWithExpectOrientation:expectOrientation centerCell:centerCell];
+    
+    CGRect expectBounds = (CGRect){CGPointZero, [self containerSizeWithOrientation:expectOrientation]};
+    self->_browser.collectionView.layout.itemSize = expectBounds.size;
+    
+    // Reset to prevent the page number change after transforming.
+    [_browser.collectionView scrollToPage:_recordPage];
+    
+    self.currentOrientation = expectOrientation;
+    self.rotating = NO;
+    
+    [self orientationDidChangedWithOrientation:expectOrientation centerCell:centerCell];
+}
+
+#pragma mark - getters & setters
+
+- (void)setRotating:(BOOL)rotating {
+    _rotating = rotating;
+    _browser.containerView.userInteractionEnabled = !rotating;
+    _browser.collectionView.userInteractionEnabled = !rotating;
+    _browser.collectionView.panGestureRecognizer.enabled = !rotating;
+}
+
+#pragma mark - calculate supported orientation of system
+
+- (UIInterfaceOrientationMask)supportSystemOrientationMask {
+    UIInterfaceOrientationMask limitMask = 0;
+    // IphoneX series do not support UIInterfaceOrientationMaskPortraitUpsideDown, except selector '-application:supportedInterfaceOrientationsForWindow:' of '[UIApplication sharedApplication].delegate' return 0. Maybe it is BUG of Apple.
+    BOOL ignoreUpsideDownIfIphoneX = YES;
+    UIInterfaceOrientationMask delegateMask = [self maskOfApplicationDelegate];
+    if (delegateMask != kMaskNull) {
+        if (delegateMask == 0) {
+            // Apple do.
+            limitMask = UIInterfaceOrientationMaskAll;
+            ignoreUpsideDownIfIphoneX = NO;
+        } else {
+            limitMask = delegateMask;
+        }
+    } else {
+        // Lower priority.
+        limitMask = [self maskOfInfoPlist];
+    }
+    
+    UIInterfaceOrientationMask supportMask = limitMask & [self maskOfViewController];
+    
+    if (ignoreUpsideDownIfIphoneX && YBIBIsIphoneXSeries() && (supportMask & UIInterfaceOrientationMaskPortraitUpsideDown)) {
+        supportMask ^= UIInterfaceOrientationMaskPortraitUpsideDown;
+    }
+    return supportMask;
+}
+
+- (UIInterfaceOrientationMask)maskOfInfoPlist {
+    // 'Info.plist' will not change in a process.
+    static UIInterfaceOrientationMask mask = 0;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        NSString *path = [[NSBundle mainBundle] pathForResource:@"Info" ofType:@"plist"];
+        NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithContentsOfFile:path];
+        NSArray *array = dict[@"UISupportedInterfaceOrientations"];
+        NSSet *set = [NSSet setWithArray:array];
+        if ([set containsObject:@"UIInterfaceOrientationPortrait"]) mask |= UIInterfaceOrientationMaskPortrait;
+        if ([set containsObject:@"UIInterfaceOrientationLandscapeRight"]) mask |= UIInterfaceOrientationMaskLandscapeRight;
+        if ([set containsObject:@"UIInterfaceOrientationLandscapeLeft"]) mask |= UIInterfaceOrientationMaskLandscapeLeft;
+        if ([set containsObject:@"UIInterfaceOrientationPortraitUpsideDown"]) mask |= UIInterfaceOrientationMaskPortraitUpsideDown;
+    });
+    return mask == 0 ? kMaskNull : mask;
+}
+
+- (UIInterfaceOrientationMask)maskOfApplicationDelegate {
+    UIInterfaceOrientationMask mask = kMaskNull;
+    id<UIApplicationDelegate> delegate = [UIApplication sharedApplication].delegate;
+    if ([delegate respondsToSelector:@selector(application:supportedInterfaceOrientationsForWindow:)]) {
+        mask = [delegate application:[UIApplication sharedApplication] supportedInterfaceOrientationsForWindow:_browser.window];
+    }
+    return mask;
+}
+
+- (UIInterfaceOrientationMask)maskOfViewController {
+    UIInterfaceOrientationMask mask = kMaskNull;
+    
+    // Find the UIViewController whitch 'browser' followed.
+    UIViewController *target = nil;
+    id next = _browser;
+    while (next) {
+        if ([next isKindOfClass:UIViewController.self]) {
+            target = next;
+            break;
+        }
+        if ([next isKindOfClass:UIWindow.self]) {
+            target = YBIBTopControllerByWindow(next);
+            break;
+        }
+        next = [next nextResponder];
+    }
+    
+    // Cover directly.
+    if (target.tabBarController) {
+        mask = target.tabBarController.shouldAutorotate ? target.tabBarController.supportedInterfaceOrientations : 0;
+    } else if (target.navigationController) {
+        mask = target.navigationController.shouldAutorotate ? target.navigationController.supportedInterfaceOrientations : 0;
+    } else {
+        mask = target.shouldAutorotate ? target.supportedInterfaceOrientations : 0;
+    }
+    return mask;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Base/YBImageBrowser+Internal.h

@@ -0,0 +1,24 @@
+//
+//  YBImageBrowser+Internal.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/1.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBImageBrowser.h"
+#import "YBIBContainerView.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBImageBrowser ()
+
+@property (nonatomic, strong) YBIBContainerView *containerView;
+
+- (void)implementGetBaseInfoProtocol:(id<YBIBGetBaseInfoProtocol>)obj;
+
+@property (nonatomic, weak, nullable) NSObject *hiddenProjectiveView;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Helper/YBIBCopywriter.h

@@ -0,0 +1,57 @@
+//
+//  YBIBCopywriter.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2018/9/13.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef NS_ENUM(NSInteger, YBIBCopywriterType) {
+    /// 简体中文
+    YBIBCopywriterTypeSimplifiedChinese,
+    /// 英文
+    YBIBCopywriterTypeEnglish
+};
+
+/**
+ 文案管理类
+ */
+@interface YBIBCopywriter : NSObject
+
+/**
+ 唯一有效单例
+ */
++ (instancetype)sharedCopywriter;
+
+/// 语言类型
+@property (nonatomic, assign) YBIBCopywriterType type;
+
+#pragma - 以下文案可更改
+
+@property (nonatomic, copy) NSString *videoIsInvalid;
+
+@property (nonatomic, copy) NSString *videoError;
+
+@property (nonatomic, copy) NSString *unableToSave;
+
+@property (nonatomic, copy) NSString *imageIsInvalid;
+
+@property (nonatomic, copy) NSString *downloadFailed;
+
+@property (nonatomic, copy) NSString *getPhotoAlbumAuthorizationFailed;
+
+@property (nonatomic, copy) NSString *saveToPhotoAlbumSuccess;
+
+@property (nonatomic, copy) NSString *saveToPhotoAlbumFailed;
+
+@property (nonatomic, copy) NSString *saveToPhotoAlbum;
+
+@property (nonatomic, copy) NSString *cancel;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Helper/YBIBCopywriter.m

@@ -0,0 +1,65 @@
+//
+//  YBIBCopywriter.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2018/9/13.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import "YBIBCopywriter.h"
+
+@implementation YBIBCopywriter
+
+#pragma mark - life cycle
+
++ (instancetype)sharedCopywriter {
+    static YBIBCopywriter *copywriter = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        copywriter = [YBIBCopywriter new];
+    });
+    return copywriter;
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _type = YBIBCopywriterTypeSimplifiedChinese;
+        NSArray *appleLanguages = [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleLanguages"];
+        if (appleLanguages && appleLanguages.count > 0) {
+            NSString *languages = appleLanguages[0];
+            if (![languages hasPrefix:@"zh-Hans"]) {
+                _type = YBIBCopywriterTypeEnglish;
+            }
+        }
+        
+        [self initCopy];
+    }
+    return self;
+}
+
+#pragma mark - private
+
+- (void)initCopy {
+    BOOL en = self.type == YBIBCopywriterTypeEnglish;
+    
+    self.videoIsInvalid = en ? @"Video is invalid" : @"视频无效";
+    self.videoError = en ? @"Video error" : @"视频错误";
+    self.unableToSave = en ? @"Unable to save" : @"无法保存";
+    self.imageIsInvalid = en ? @"Image is invalid" : @"图片无效";
+    self.downloadFailed = en ? @"Download failed" : @"加载图片失败";
+    self.getPhotoAlbumAuthorizationFailed = en ? @"Failed to get album authorization" : @"获取相册权限失败";
+    self.saveToPhotoAlbumSuccess = en ? @"Save successful" : @"已保存到系统相册";
+    self.saveToPhotoAlbumFailed = en ? @"Save failed" : @"保存失败";
+    self.saveToPhotoAlbum = en ? @"Save" : @"保存到相册";
+    self.cancel = en ? @"Cancel" : @"取消";
+}
+
+#pragma mark - public
+
+- (void)setType:(YBIBCopywriterType)type {
+    _type = type;
+    [self initCopy];
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Helper/YBIBIconManager.h

@@ -0,0 +1,63 @@
+//
+//  YBIBIconManager.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2018/8/29.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface UIImage (YBImageBrowser)
+
+/**
+ 获取图片便利构造方法
+
+ @param name 图片名字
+ @param bundle 资源对象
+ @return 图片实例
+ */
++ (instancetype)ybib_imageNamed:(NSString *)name bundle:(NSBundle *)bundle;
+
+@end
+
+
+/// 获取图片闭包
+typedef UIImage * _Nullable (^YBIBIconBlock)(void);
+
+/**
+ 图标管理类
+ */
+@interface YBIBIconManager : NSObject
+
+/**
+ 唯一有效单例
+ */
++ (instancetype)sharedManager;
+
+#pragma - 以下图片可更改
+
+/// 基本-加载
+@property (nonatomic, copy) YBIBIconBlock loadingImage;
+
+/// 工具视图-保存
+@property (nonatomic, copy) YBIBIconBlock toolSaveImage;
+/// 工具视图-更多
+@property (nonatomic, copy) YBIBIconBlock toolMoreImage;
+
+/// 视频-播放
+@property (nonatomic, copy) YBIBIconBlock videoPlayImage;
+/// 视频-暂停
+@property (nonatomic, copy) YBIBIconBlock videoPauseImage;
+/// 视频-取消
+@property (nonatomic, copy) YBIBIconBlock videoCancelImage;
+/// 视频-播放大图
+@property (nonatomic, copy) YBIBIconBlock videoBigPlayImage;
+/// 视频-拖动圆点
+@property (nonatomic, copy) YBIBIconBlock videoDragCircleImage;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Helper/YBIBIconManager.m

@@ -0,0 +1,138 @@
+//
+//  YBIBIconManager.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2018/8/29.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import "YBIBIconManager.h"
+
+// The best order for path scale search.
+static NSArray *_NSBundlePreferredScales() {
+    static NSArray *scales;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        CGFloat screenScale = [UIScreen mainScreen].scale;
+        if (screenScale <= 1) {
+            scales = @[@1,@2,@3];
+        } else if (screenScale <= 2) {
+            scales = @[@2,@3,@1];
+        } else {
+            scales = @[@3,@2,@1];
+        }
+    });
+    return scales;
+}
+
+// Add scale modifier to the file name (without path extension), from @"name" to @"name@2x".
+static NSString *_NSStringByAppendingNameScale(NSString *string, CGFloat scale) {
+    if (!string) return nil;
+    if (fabs(scale - 1) <= __FLT_EPSILON__ || string.length == 0 || [string hasSuffix:@"/"]) return string.copy;
+    return [string stringByAppendingFormat:@"@%@x", @(scale)];
+}
+
+@implementation UIImage (YBImageBrowser)
+
++ (instancetype)ybib_imageNamed:(NSString *)name bundle:(NSBundle *)bundle {
+    if (name.length == 0) return nil;
+    if ([name hasSuffix:@"/"]) return nil;
+    
+    NSString *res = name.stringByDeletingPathExtension;
+    NSString *ext = name.pathExtension;
+    NSString *path = nil;
+    CGFloat scale = 1;
+    
+    // If no extension, guess by system supported (same as UIImage).
+    NSArray *exts = ext.length > 0 ? @[ext] : @[@"", @"png", @"jpeg", @"jpg", @"gif", @"webp", @"apng"];
+    NSArray *scales = _NSBundlePreferredScales();
+    for (int s = 0; s < scales.count; s++) {
+        scale = ((NSNumber *)scales[s]).floatValue;
+        NSString *scaledName = _NSStringByAppendingNameScale(res, scale);
+        for (NSString *e in exts) {
+            path = [bundle pathForResource:scaledName ofType:e];
+            if (path) break;
+        }
+        if (path) break;
+    }
+    if (path.length == 0) {
+        // Assets.xcassets supported.
+        return [self imageNamed:name];
+    }
+    
+    NSData *data = [NSData dataWithContentsOfFile:path];
+    if (data.length == 0) return nil;
+    
+    return [[self alloc] initWithData:data scale:scale];
+}
+
+@end
+
+
+NSBundle *YBIBDefaultBundle(void) {
+    static NSBundle *bundle = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        NSBundle *_bundle = [NSBundle bundleForClass:NSClassFromString(@"YBImageBrowser")];
+        NSString *path = [_bundle pathForResource:@"YBImageBrowser" ofType:@"bundle"];
+        bundle = [NSBundle bundleWithPath:path];
+    });
+    return bundle;
+}
+
+NSBundle *YBIBVideoBundle(void) {
+    static NSBundle *bundle = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        NSBundle *_bundle = [NSBundle bundleForClass:NSClassFromString(@"YBImageBrowser")];
+        NSString *path = [_bundle pathForResource:@"YBImageBrowserVideo" ofType:@"bundle"];
+        bundle = [NSBundle bundleWithPath:path];
+    });
+    return bundle;
+}
+
+@implementation YBIBIconManager
+
++ (instancetype)sharedManager {
+    static YBIBIconManager *manager = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        manager = [YBIBIconManager new];
+    });
+    return manager;
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _loadingImage = ^UIImage * _Nullable{
+            return [UIImage ybib_imageNamed:@"ybib_loading" bundle:YBIBDefaultBundle()];
+        };
+        
+        _toolSaveImage = ^UIImage * _Nullable{
+            return [UIImage ybib_imageNamed:@"ybib_save" bundle:YBIBDefaultBundle()];
+        };
+        _toolMoreImage = ^UIImage * _Nullable{
+            return [UIImage ybib_imageNamed:@"ybib_more" bundle:YBIBDefaultBundle()];
+        };
+        
+        _videoPlayImage = ^UIImage * _Nullable{
+            return [UIImage ybib_imageNamed:@"ybib_play" bundle:YBIBVideoBundle()];
+        };
+        _videoPauseImage = ^UIImage * _Nullable{
+            return [UIImage ybib_imageNamed:@"ybib_pause" bundle:YBIBVideoBundle()];
+        };
+        _videoCancelImage = ^UIImage * _Nullable{
+            return [UIImage ybib_imageNamed:@"ybib_cancel" bundle:YBIBVideoBundle()];
+        };
+        _videoBigPlayImage = ^UIImage * _Nullable{
+            return [UIImage ybib_imageNamed:@"ybib_bigPlay" bundle:YBIBVideoBundle()];
+        };
+        _videoDragCircleImage = ^UIImage * _Nullable{
+            return [UIImage ybib_imageNamed:@"ybib_circlePoint" bundle:YBIBVideoBundle()];
+        };
+    }
+    return self;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Helper/YBIBPhotoAlbumManager.h

@@ -0,0 +1,32 @@
+//
+//  YBIBPhotoAlbumManager.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2018/8/28.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import <Photos/Photos.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBPhotoAlbumManager : NSObject
+
+/**
+ Get photo album authorization.
+ */
++ (void)getPhotoAlbumAuthorizationSuccess:(void(^)(void))success failed:(void(^)(void))failed;
+
+/**
+ Get 'AVAsset' by 'PHAsset' asynchronously, callback is in child thread.
+ */
++ (void)getAVAssetWithPHAsset:(PHAsset *)phAsset completion:(void(^)(AVAsset * _Nullable asset))completion;
+
+/**
+ Get 'ImageData' by 'PHAsset' synchronously, callback is in child thread.
+ */
++ (void)getImageDataWithPHAsset:(PHAsset *)phAsset completion:(void(^)(NSData * _Nullable data))completion;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Helper/YBIBPhotoAlbumManager.m

@@ -0,0 +1,65 @@
+//
+//  YBIBPhotoAlbumManager.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2018/8/28.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import "YBIBPhotoAlbumManager.h"
+#import "YBIBUtilities.h"
+
+@implementation YBIBPhotoAlbumManager
+
++ (void)getAVAssetWithPHAsset:(PHAsset *)phAsset completion:(nonnull void (^)(AVAsset * _Nullable))completion {
+    PHVideoRequestOptions *options = [PHVideoRequestOptions new];
+    options.networkAccessAllowed = YES;
+    [[PHImageManager defaultManager] requestAVAssetForVideo:phAsset options:options resultHandler:^(AVAsset * _Nullable asset, AVAudioMix * _Nullable audioMix, NSDictionary * _Nullable info) {
+        completion(asset);
+    }];
+}
+
++ (void)getImageDataWithPHAsset:(PHAsset *)phAsset completion:(nonnull void (^)(NSData * _Nullable))completion {
+    PHImageRequestOptions *options = [PHImageRequestOptions new];
+    options.networkAccessAllowed = YES;
+    options.resizeMode = PHImageRequestOptionsResizeModeNone;
+    // Only when this property is YES, the callback will in child thread.
+    options.synchronous = YES;
+    [[PHImageManager defaultManager] requestImageDataForAsset:phAsset options:options resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
+        BOOL complete = ![[info objectForKey:PHImageCancelledKey] boolValue] && ![info objectForKey:PHImageErrorKey] && ![[info objectForKey:PHImageResultIsDegradedKey] boolValue];
+        if (complete && imageData) {
+            completion(imageData);
+        } else {
+            completion(nil);
+        }
+    }];
+}
+
++ (void)getPhotoAlbumAuthorizationSuccess:(void(^)(void))success failed:(void(^)(void))failed {
+    PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
+    switch (status) {
+        case PHAuthorizationStatusDenied:
+            if (failed) failed();
+            break;
+        case PHAuthorizationStatusRestricted:
+            if (failed) failed();
+            break;
+        case PHAuthorizationStatusNotDetermined: {
+            [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status){
+                YBIB_DISPATCH_ASYNC_MAIN(^{
+                    if (status == PHAuthorizationStatusAuthorized) {
+                        if (success) success();
+                    } else {
+                        if (failed) failed();
+                    }
+                })
+            }];
+        }
+            break;
+        case PHAuthorizationStatusAuthorized:
+            if (success) success();
+            break;
+    }
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Helper/YBIBSentinel.h

@@ -0,0 +1,29 @@
+//
+//  YBIBSentinel.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/18.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ Thread safe.
+ */
+@interface YBIBSentinel : NSObject
+
+/// Returns the current value of the counter.
+@property (readonly) int32_t value;
+
+/**
+ Increase the value atomically.
+ @return The new value.
+ */
+- (int32_t)increase;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Helper/YBIBSentinel.m

@@ -0,0 +1,24 @@
+//
+//  YBIBSentinel.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/18.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBSentinel.h"
+#import <libkern/OSAtomic.h>
+
+@implementation YBIBSentinel {
+    int32_t _value;
+}
+
+- (int32_t)value {
+    return _value;
+}
+
+- (int32_t)increase {
+    return OSAtomicIncrement32(&_value);
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Helper/YBIBUtilities.h

@@ -0,0 +1,52 @@
+//
+//  YBIBUtilities.h
+//  YBImageBrowserDemo
+//
+//  Created by 杨少 on 2018/4/11.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+
+#define YBIB_DISPATCH_ASYNC(queue, block)\
+if (strcmp(dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL), dispatch_queue_get_label(queue)) == 0) {\
+block();\
+} else {\
+dispatch_async(queue, block);\
+}
+
+#define YBIB_DISPATCH_ASYNC_MAIN(block) YBIB_DISPATCH_ASYNC(dispatch_get_main_queue(), block)
+
+
+#define YBIB_CODE_EXEC_TIME(KEY, ...) \
+CFAbsoluteTime startTime = CFAbsoluteTimeGetCurrent(); \
+__VA_ARGS__ \
+CFAbsoluteTime linkTime = (CFAbsoluteTimeGetCurrent() - startTime); \
+NSLog(@"%@ Time-Consuming: %fms", KEY, linkTime * 1000.0);
+
+
+UIWindow * _Nonnull YBIBNormalWindow(void);
+
+UIViewController * _Nullable YBIBTopController(void);
+UIViewController * _Nullable YBIBTopControllerByWindow(UIWindow *);
+
+BOOL YBIBLowMemory(void);
+
+BOOL YBIBIsIphoneXSeries(void);
+CGFloat YBIBStatusbarHeight(void);
+CGFloat YBIBSafeAreaBottomHeight(void);
+
+UIImage *YBIBSnapshotView(UIView *);
+
+/// This is orientation of 'YBImageBrowser' not 'UIDevice'.
+UIEdgeInsets YBIBPaddingByBrowserOrientation(UIDeviceOrientation);
+
+
+@interface YBIBUtilities : NSObject
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Helper/YBIBUtilities.m

@@ -0,0 +1,134 @@
+//
+//  YBIBUtilities.m
+//  YBImageBrowserDemo
+//
+//  Created by 杨少 on 2018/4/11.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import "YBIBUtilities.h"
+#import <sys/utsname.h>
+
+
+UIWindow * _Nullable YBIBNormalWindow(void) {
+    UIWindow *window = [[UIApplication sharedApplication] keyWindow];
+    if (window.windowLevel != UIWindowLevelNormal) {
+        NSArray *windows = [[UIApplication sharedApplication] windows];
+        for(UIWindow *temp in windows) {
+            if (temp.windowLevel == UIWindowLevelNormal) {
+                return temp;
+            }
+        }
+    }
+    return window;
+}
+
+UIViewController * _Nullable YBIBTopController(void) {
+    return YBIBTopControllerByWindow(YBIBNormalWindow());
+}
+
+UIViewController * _Nullable YBIBTopControllerByWindow(UIWindow *window) {
+    if (!window) return nil;
+        
+    UIViewController *top = nil;
+    id nextResponder;
+    if (window.subviews.count > 0) {
+        UIView *frontView = [window.subviews objectAtIndex:0];
+        nextResponder = frontView.nextResponder;
+    }
+    if (nextResponder && [nextResponder isKindOfClass:UIViewController.class]) {
+        top = nextResponder;
+    } else {
+        top = window.rootViewController;
+    }
+    
+    while ([top isKindOfClass:UITabBarController.class] || [top isKindOfClass:UINavigationController.class] || top.presentedViewController) {
+        if ([top isKindOfClass:UITabBarController.class]) {
+            top = ((UITabBarController *)top).selectedViewController;
+        } else if ([top isKindOfClass:UINavigationController.class]) {
+            top = ((UINavigationController *)top).topViewController;
+        } else if (top.presentedViewController) {
+            top = top.presentedViewController;
+        }
+    }
+    return top;
+}
+
+BOOL YBIBLowMemory(void) {
+    static BOOL lowMemory = NO;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        unsigned long long physicalMemory = [[NSProcessInfo processInfo] physicalMemory];
+        lowMemory = physicalMemory > 0 && physicalMemory < 1024 * 1024 * 1500;
+    });
+    return lowMemory;
+}
+
+BOOL YBIBIsIphoneXSeries(void) {
+    return YBIBStatusbarHeight() > 20;
+}
+
+CGFloat YBIBStatusbarHeight(void) {
+    CGFloat height = 0;
+    if (@available(iOS 11.0, *)) {
+        height = UIApplication.sharedApplication.delegate.window.safeAreaInsets.top;
+    }
+    if (height <= 0) {
+        height = UIApplication.sharedApplication.statusBarFrame.size.height;
+    }
+    if (height <= 0) {
+        height = 20;
+    }
+    return height;
+}
+
+CGFloat YBIBSafeAreaBottomHeight(void) {
+    CGFloat bottom = 0;
+    if (@available(iOS 11.0, *)) {
+        bottom = UIApplication.sharedApplication.delegate.window.safeAreaInsets.bottom;
+    }
+    return bottom;
+}
+
+UIImage *YBIBSnapshotView(UIView *view) {
+    UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, [UIScreen mainScreen].scale);
+    [view drawViewHierarchyInRect:view.bounds afterScreenUpdates:NO];
+    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
+    UIGraphicsEndImageContext();
+    return image;
+}
+
+UIEdgeInsets YBIBPaddingByBrowserOrientation(UIDeviceOrientation orientation) {
+    UIEdgeInsets padding = UIEdgeInsetsZero;
+    if (!YBIBIsIphoneXSeries()) return padding;
+    
+    UIDeviceOrientation barOrientation = (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation;
+    
+    if (UIDeviceOrientationIsLandscape(orientation)) {
+        BOOL same = orientation == barOrientation;
+        BOOL reverse = !same && UIDeviceOrientationIsLandscape(barOrientation);
+        if (same) {
+            padding.bottom = YBIBSafeAreaBottomHeight();
+            padding.top = 0;
+        } else if (reverse) {
+            padding.top = YBIBSafeAreaBottomHeight();
+            padding.bottom = 0;
+        }
+        padding.left = padding.right = MAX(YBIBSafeAreaBottomHeight(), YBIBStatusbarHeight());
+    } else {
+        if (orientation == UIDeviceOrientationPortrait) {
+            padding.top = YBIBStatusbarHeight();
+            padding.bottom = barOrientation == UIDeviceOrientationPortrait ? YBIBSafeAreaBottomHeight() : 0;
+        } else {
+            padding.bottom = YBIBStatusbarHeight();
+            padding.top = barOrientation == UIDeviceOrientationPortrait ? YBIBSafeAreaBottomHeight() : 0;
+        }
+        padding.left = padding.right = UIDeviceOrientationIsLandscape(barOrientation) ? YBIBSafeAreaBottomHeight() : 0 ;
+    }
+    return padding;
+}
+
+
+@implementation YBIBUtilities
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageCache+Internal.h

@@ -0,0 +1,33 @@
+//
+//  YBIBImageCache+Internal.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/13.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBImageCache.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef NS_ENUM(NSInteger, YBIBImageCacheType) {
+    YBIBImageCacheTypeOrigin,
+    YBIBImageCacheTypeCompressed
+};
+
+/**
+ Not thread safe.
+ */
+@interface YBIBImageCache ()
+
+- (void)setImage:(UIImage *)image type:(YBIBImageCacheType)type forKey:(NSString *)key resident:(BOOL)resident;
+
+- (nullable UIImage *)imageForKey:(NSString *)key type:(YBIBImageCacheType)type;
+
+- (void)removeForKey:(NSString *)key;
+
+- (void)removeResidentForKey:(NSString *)key;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageCache.h

@@ -0,0 +1,30 @@
+//
+//  YBIBImageCache.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/13.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class YBIBImageCache;
+
+@interface NSObject (YBIBImageCache)
+
+/// 图片浏览器持有的图片缓存管理类
+@property (nonatomic, strong, readonly) YBIBImageCache *ybib_imageCache;
+
+@end
+
+
+@interface YBIBImageCache : NSObject
+
+/// 缓存数量限制（一个单位表示一个 YBIBImageData 产生的所有图片数据）
+@property (nonatomic, assign) NSUInteger imageCacheCountLimit;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageCache.m

@@ -0,0 +1,112 @@
+//
+//  YBIBImageCache.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/13.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBImageCache.h"
+#import "YBIBImageCache+Internal.h"
+#import "YBIBUtilities.h"
+#import <objc/runtime.h>
+
+
+@implementation NSObject (YBIBImageCache)
+static void *YBIBImageCacheKey = &YBIBImageCacheKey;
+- (void)setYbib_imageCache:(YBIBImageCache *)ybib_imageCache {
+    objc_setAssociatedObject(self, YBIBImageCacheKey, ybib_imageCache, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+- (YBIBImageCache *)ybib_imageCache {
+    YBIBImageCache *cache = objc_getAssociatedObject(self, YBIBImageCacheKey);
+    if (!cache) {
+        cache = [YBIBImageCache new];
+        self.ybib_imageCache = cache;
+    }
+    return cache;
+}
+@end
+
+
+@interface YBIBImageCachePack : NSObject
+@property (nonatomic, strong) UIImage *originImage;
+@property (nonatomic, strong) UIImage *compressedImage;
+@end
+@implementation YBIBImageCachePack
+@end
+
+
+@implementation YBIBImageCache {
+    NSCache<NSString *, YBIBImageCachePack *> *_imageCache;
+    NSMutableDictionary<NSString *, YBIBImageCachePack *> *_residentCache;
+}
+
+#pragma mark - life cycle
+
+- (void)dealloc {
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _imageCache = [NSCache new];
+        _imageCache.countLimit = _imageCacheCountLimit = YBIBLowMemory() ? 6 : 12;
+        _residentCache = [NSMutableDictionary dictionary];
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+    }
+    return self;
+}
+
+#pragma mark - event
+
+- (void)didReceiveMemoryWarning:(NSNotification *)notification {
+    [_imageCache removeAllObjects];
+    [_residentCache removeAllObjects];
+}
+
+#pragma mark - public
+
+- (void)setImage:(UIImage *)image type:(YBIBImageCacheType)type forKey:(NSString *)key resident:(BOOL)resident {
+    YBIBImageCachePack *pack = [_imageCache objectForKey:key];
+    if (!pack) {
+        pack = [YBIBImageCachePack new];
+        [_imageCache setObject:pack forKey:key];
+    }
+    switch (type) {
+        case YBIBImageCacheTypeOrigin:
+            pack.originImage = image;
+            break;
+        case YBIBImageCacheTypeCompressed:
+            pack.compressedImage = image;
+            break;
+    }
+    [_residentCache setObject:pack forKey:key];
+}
+
+- (UIImage *)imageForKey:(NSString *)key type:(YBIBImageCacheType)type {
+    YBIBImageCachePack *pack = [_imageCache objectForKey:key] ?: [_residentCache objectForKey:key];
+    switch (type) {
+        case YBIBImageCacheTypeOrigin: return pack.originImage;
+        case YBIBImageCacheTypeCompressed: return pack.compressedImage;
+        default: return nil;
+    }
+}
+
+- (void)removeForKey:(NSString *)key {
+    [_imageCache removeObjectForKey:key];
+    [_residentCache removeObjectForKey:key];
+}
+
+- (void)removeResidentForKey:(NSString *)key {
+    [_residentCache removeObjectForKey:key];
+}
+
+#pragma mark - setter
+
+- (void)setImageCacheCountLimit:(NSUInteger)imageCacheCountLimit {
+    _imageCacheCountLimit = imageCacheCountLimit;
+    _imageCache.countLimit = imageCacheCountLimit;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageCell+Internal.h

@@ -0,0 +1,22 @@
+//
+//  YBIBImageCell+Internal.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/12/23.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBImageCell.h"
+#import "YBIBImageScrollView.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBImageCell ()
+
+@property (nonatomic, strong) YBIBImageScrollView *imageScrollView;
+
+@property (nonatomic, strong) UIImageView *tailoringImageView;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageCell.h

@@ -0,0 +1,17 @@
+//
+//  YBIBImageCell.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/5.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBCellProtocol.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBImageCell : UICollectionViewCell <YBIBCellProtocol>
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageCell.m

@@ -0,0 +1,522 @@
+//
+//  YBIBImageCell.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/5.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBImageCell.h"
+#import "YBIBImageData.h"
+#import "YBIBIconManager.h"
+#import "YBIBImageCell+Internal.h"
+#import "YBIBImageData+Internal.h"
+#import "YBIBCopywriter.h"
+#import "YBIBUtilities.h"
+
+@interface YBIBImageCell () <YBIBImageDataDelegate, UIScrollViewDelegate, UIGestureRecognizerDelegate>
+@end
+
+@implementation YBIBImageCell {
+    CGPoint _interactStartPoint;
+    BOOL _interacting;
+}
+
+#pragma mark - life cycle
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        [self initValue];
+        [self.contentView addSubview:self.imageScrollView];
+        [self addGesture];
+    }
+    return self;
+}
+
+- (void)layoutSubviews {
+    [super layoutSubviews];
+    self.imageScrollView.frame = self.bounds;
+}
+
+- (void)initValue {
+    _interactStartPoint = CGPointZero;
+    _interacting = NO;
+}
+
+- (void)prepareForReuse {
+    ((YBIBImageData *)self.yb_cellData).delegate = nil;
+    [self.imageScrollView reset];
+    [self hideTailoringImageView];
+    [self hideAuxiliaryView];
+    [super prepareForReuse];
+}
+
+#pragma mark - <YBIBCellProtocol>
+
+@synthesize yb_currentOrientation = _yb_currentOrientation;
+@synthesize yb_containerSize = _yb_containerSize;
+@synthesize yb_backView = _yb_backView;
+@synthesize yb_collectionView = _yb_collectionView;
+@synthesize yb_isTransitioning = _yb_isTransitioning;
+@synthesize yb_isRotating = _yb_isRotating;
+@synthesize yb_auxiliaryViewHandler = _yb_auxiliaryViewHandler;
+@synthesize yb_hideStatusBar = _yb_hideStatusBar;
+@synthesize yb_hideBrowser = _yb_hideBrowser;
+@synthesize yb_hideToolViews = _yb_hideToolViews;
+@synthesize yb_cellData = _yb_cellData;
+@synthesize yb_cellIsInCenter = _yb_cellIsInCenter;
+@synthesize yb_selfPage = _yb_selfPage;
+@synthesize yb_currentPage = _yb_currentPage;
+
+- (void)setYb_cellData:(id<YBIBDataProtocol>)yb_cellData {
+    _yb_cellData = yb_cellData;
+    ((YBIBImageData *)yb_cellData).delegate = self;
+}
+
+- (UIView *)yb_foregroundView {
+    return self.imageScrollView.imageView;
+}
+
+- (void)yb_orientationWillChangeWithExpectOrientation:(UIDeviceOrientation)orientation {
+    [self hideTailoringImageView];
+}
+
+- (void)yb_orientationChangeAnimationWithExpectOrientation:(UIDeviceOrientation)orientation {
+    [self updateImageLayoutWithOrientation:orientation previousImageSize:self.imageScrollView.imageView.image.size];
+}
+
+#pragma mark - private
+
+- (CGSize)contentSizeWithContainerSize:(CGSize)containerSize imageViewFrame:(CGRect)imageViewFrame {
+    return CGSizeMake(MAX(containerSize.width, imageViewFrame.size.width), MAX(containerSize.height, imageViewFrame.size.height));
+}
+
+- (void)updateImageLayoutWithOrientation:(UIDeviceOrientation)orientation previousImageSize:(CGSize)previousImageSize {
+    if (_interacting) [self restoreInteractionWithDuration:0];
+    
+    YBIBImageData *data = self.yb_cellData;
+    
+    CGSize imageSize;
+    
+    UIImage *image = self.imageScrollView.imageView.image;
+    YBIBScrollImageType imageType = self.imageScrollView.imageType;
+    if (imageType == YBIBScrollImageTypeCompressed) {
+        imageSize = data.originImage ? data.originImage.size : image.size;
+    } else {
+        imageSize = image.size;
+    }
+    
+    CGSize containerSize = self.yb_containerSize(orientation);
+    CGRect imageViewFrame = [data.layout yb_imageViewFrameWithContainerSize:containerSize imageSize:imageSize orientation:orientation];
+    CGSize contentSize = [self contentSizeWithContainerSize:containerSize imageViewFrame:imageViewFrame];
+    CGFloat maxZoomScale = imageType == YBIBScrollImageTypeThumb ? 1 : [data.layout yb_maximumZoomScaleWithContainerSize:containerSize imageSize:imageSize orientation:orientation];
+    
+    // 'zoomScale' must set before 'contentSize' and 'imageView.frame'.
+    self.imageScrollView.zoomScale = 1;
+    self.imageScrollView.contentSize = contentSize;
+    self.imageScrollView.minimumZoomScale = 1;
+    self.imageScrollView.maximumZoomScale = maxZoomScale;
+    
+    CGFloat scale;
+    if (previousImageSize.width > 0 && previousImageSize.height > 0) {
+        scale = imageSize.width / imageSize.height - previousImageSize.width / previousImageSize.height;
+    } else {
+        scale = 0;
+    }
+    // '0.001' is admissible error.
+    if (ABS(scale) <= 0.001) {
+        self.imageScrollView.imageView.frame = imageViewFrame;
+    } else {
+        [UIView animateWithDuration:0.25 animations:^{
+            self.imageScrollView.imageView.frame = imageViewFrame;
+        }];
+    }
+}
+
+- (void)cuttingImage {
+    // This method has been delayed called, so 'browser' may be in transit now.
+    if (self.yb_isTransitioning()) return;
+    if (_interacting) return;
+    
+    YBIBImageData *data = self.yb_cellData;
+    if (!data.originImage) return;
+    
+    if (self.imageScrollView.zoomScale < data.cuttingZoomScale) return;
+    
+    if ([data shouldCompress]) {
+        [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(cuttingImage_) object:nil];
+        [self performSelector:@selector(cuttingImage_) withObject:nil afterDelay:0.15];
+    }
+}
+- (void)cuttingImage_ {
+    YBIBImageData *data = self.yb_cellData;
+    if (!data.originImage) return;
+    
+    CGFloat scale = data.originImage.size.width / self.imageScrollView.contentSize.width;
+    CGFloat x = self.imageScrollView.contentOffset.x * scale,
+    y = self.imageScrollView.contentOffset.y * scale,
+    width = self.imageScrollView.bounds.size.width * scale,
+    height = self.imageScrollView.bounds.size.height * scale;
+    
+    __weak typeof(self) wSelf = self;
+    [data cuttingImageToRect:CGRectMake(x, y, width, height) complete:^(UIImage *image) {
+        if (!image) return;
+        YBIB_DISPATCH_ASYNC_MAIN(^{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            if (data == self.yb_cellData && !self.imageScrollView.isDragging && !self->_interacting && !self.yb_isTransitioning()) {
+                [self showTailoringImageView:image];
+            }
+        })
+    }];
+}
+
+- (void)showTailoringImageView:(UIImage *)image {
+    CGSize containerSize = self.yb_containerSize(self.yb_currentOrientation());
+    if (!self.tailoringImageView.superview) {
+        [self.contentView addSubview:self.tailoringImageView];
+    }
+    self.tailoringImageView.frame = CGRectMake(0, 0, containerSize.width, containerSize.height);
+    self.tailoringImageView.hidden = NO;
+    self.tailoringImageView.image = image;
+}
+
+- (void)hideTailoringImageView {
+    // Don't use 'getter' method, because it's according to the need to load.
+    if (_tailoringImageView) {
+        self.tailoringImageView.hidden = YES;
+    }
+}
+
+- (void)hideAuxiliaryView {
+    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+    [self.yb_auxiliaryViewHandler() yb_hideToastWithContainer:self];
+}
+
+- (void)hideBrowser {
+    ((YBIBImageData *)self.yb_cellData).delegate = nil;
+    [self hideTailoringImageView];
+    [self hideAuxiliaryView];
+    self.yb_hideBrowser();
+    _interacting = NO;
+}
+
+#pragma mark - <YBIBImageDataDelegate>
+
+- (void)yb_imageData:(YBIBImageData *)data startLoadingWithStatus:(YBIBImageLoadingStatus)status {
+    switch (status) {
+        case YBIBImageLoadingStatusDecoding: {
+            if (!self.imageScrollView.imageView.image) {
+                [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self];
+            }
+        }
+            break;
+        case YBIBImageLoadingStatusProcessing: {
+            if (!self.imageScrollView.imageView.image) {
+                [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self];
+            }
+        }
+            break;
+        case YBIBImageLoadingStatusCompressing: {
+            if (!self.imageScrollView.imageView.image) {
+                [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self];
+            }
+        }
+            break;
+        case YBIBImageLoadingStatusReadingPHAsset: {
+            if (!self.imageScrollView.imageView.image) {
+                [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self];
+            }
+        }
+            break;
+        case YBIBImageLoadingStatusNone: {
+            [self hideAuxiliaryView];
+        }
+            break;
+        default:
+            break;
+    }
+}
+
+- (void)yb_imageData:(YBIBImageData *)data readyForImage:(__kindof UIImage *)image {
+    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+    if (self.imageScrollView.imageView.image == image) return;
+    
+    CGSize size = self.imageScrollView.imageView.image.size;
+    [self.imageScrollView setImage:image type:YBIBScrollImageTypeOriginal];
+    [self updateImageLayoutWithOrientation:self.yb_currentOrientation() previousImageSize:size];
+}
+
+- (void)yb_imageData:(YBIBImageData *)data readyForCompressedImage:(__kindof UIImage *)image {
+    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+    if (self.imageScrollView.imageView.image == image) return;
+    
+    CGSize size = self.imageScrollView.imageView.image.size;
+    [self.imageScrollView setImage:image type:YBIBScrollImageTypeCompressed];
+    [self updateImageLayoutWithOrientation:self.yb_currentOrientation() previousImageSize:size];
+}
+
+- (void)yb_imageData:(YBIBImageData *)data readyForThumbImage:(__kindof UIImage *)image {
+    if (self.imageScrollView.imageView.image) return;
+    
+    [self.imageScrollView setImage:image type:YBIBScrollImageTypeThumb];
+    [self updateImageLayoutWithOrientation:self.yb_currentOrientation() previousImageSize:image.size];
+}
+
+- (void)yb_imageIsInvalidForData:(YBIBImageData *)data {
+    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+    NSString *imageIsInvalid = [YBIBCopywriter sharedCopywriter].imageIsInvalid;
+    if (self.imageScrollView.imageView.image) {
+        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self text:imageIsInvalid];
+    } else {
+        [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self text:imageIsInvalid];
+    }
+}
+
+- (void)yb_imageData:(YBIBImageData *)data downloadProgress:(CGFloat)progress {
+    [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self progress:progress];
+}
+
+- (void)yb_imageDownloadFailedForData:(YBIBImageData *)data {
+    if (self.imageScrollView.imageView.image) {
+        [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
+        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self text:[YBIBCopywriter sharedCopywriter].downloadFailed];
+    } else {
+        [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self text:[YBIBCopywriter sharedCopywriter].downloadFailed];
+    }
+}
+
+#pragma mark - gesture
+
+- (void)addGesture {
+    UITapGestureRecognizer *tapSingle = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(respondsToTapSingle:)];
+    tapSingle.numberOfTapsRequired = 1;
+    UITapGestureRecognizer *tapDouble = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(respondsToTapDouble:)];
+    tapDouble.numberOfTapsRequired = 2;
+    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(respondsToPan:)];
+    pan.maximumNumberOfTouches = 1;
+    pan.delegate = self;
+    
+    [tapSingle requireGestureRecognizerToFail:tapDouble];
+    [tapSingle requireGestureRecognizerToFail:pan];
+    [tapDouble requireGestureRecognizerToFail:pan];
+    
+    [self addGestureRecognizer:tapSingle];
+    [self addGestureRecognizer:tapDouble];
+    [self addGestureRecognizer:pan];
+}
+
+- (void)respondsToTapSingle:(UITapGestureRecognizer *)tap {
+    if (self.yb_isRotating()) return;
+    
+    YBIBImageData *data = self.yb_cellData;
+    if (data.singleTouchBlock) {
+        data.singleTouchBlock(data);
+    } else {
+        [self hideTailoringImageView];
+        [self hideAuxiliaryView];
+        self.yb_hideBrowser();
+    }
+}
+
+- (void)respondsToTapDouble:(UITapGestureRecognizer *)tap {
+    if (self.yb_isRotating()) return;
+    
+    [self hideTailoringImageView];
+    
+    UIScrollView *scrollView = self.imageScrollView;
+    UIView *zoomView = [self viewForZoomingInScrollView:scrollView];
+    CGPoint point = [tap locationInView:zoomView];
+    if (!CGRectContainsPoint(zoomView.bounds, point)) return;
+    if (scrollView.zoomScale == scrollView.maximumZoomScale) {
+        [scrollView setZoomScale:1 animated:YES];
+    } else {
+        [scrollView zoomToRect:CGRectMake(point.x, point.y, 1, 1) animated:YES];
+    }
+}
+
+- (void)respondsToPan:(UIPanGestureRecognizer *)pan {
+    if (self.yb_isRotating()) return;
+    
+    YBIBInteractionProfile *profile = ((YBIBImageData *)self.yb_cellData).interactionProfile;
+    if (profile.disable) return;
+    if ((CGRectIsEmpty(self.imageScrollView.imageView.frame) || !self.imageScrollView.imageView.image)) return;
+    
+    CGPoint point = [pan locationInView:self];
+    CGSize containerSize = self.yb_containerSize(self.yb_currentOrientation());
+    
+    if (pan.state == UIGestureRecognizerStateBegan) {
+        _interactStartPoint = point;
+    } else if (pan.state == UIGestureRecognizerStateCancelled || pan.state == UIGestureRecognizerStateEnded || pan.state == UIGestureRecognizerStateRecognized || pan.state == UIGestureRecognizerStateFailed) {
+        
+        // End.
+        if (_interacting) {
+            CGPoint velocity = [pan velocityInView:self.imageScrollView];
+            
+            BOOL velocityArrive = ABS(velocity.y) > profile.dismissVelocityY;
+            BOOL distanceArrive = ABS(point.y - _interactStartPoint.y) > containerSize.height * profile.dismissScale;
+            
+            BOOL shouldDismiss = distanceArrive || velocityArrive;
+            if (shouldDismiss) {
+                [self hideBrowser];
+            } else {
+                [self restoreInteractionWithDuration:profile.restoreDuration];
+            }
+        }
+        
+    } else if (pan.state == UIGestureRecognizerStateChanged) {
+        if (_interacting) {
+
+            // Change.
+            self.imageScrollView.center = point;
+            CGFloat scale = 1 - ABS(point.y - _interactStartPoint.y) / (containerSize.height * 1.2);
+            if (scale > 1) scale = 1;
+            if (scale < 0.35) scale = 0.35;
+            self.imageScrollView.transform = CGAffineTransformMakeScale(scale, scale);
+
+            CGFloat alpha = 1 - ABS(point.y - _interactStartPoint.y) / (containerSize.height * 0.7);
+            if (alpha > 1) alpha = 1;
+            if (alpha < 0) alpha = 0;
+            self.yb_backView.backgroundColor = [self.yb_backView.backgroundColor colorWithAlphaComponent:alpha];
+
+        } else {
+
+            // Start.
+            if (CGPointEqualToPoint(_interactStartPoint, CGPointZero) || self.yb_currentPage() != self.yb_selfPage() || !self.yb_cellIsInCenter() || self.imageScrollView.isZooming) return;
+
+            CGPoint velocity = [pan velocityInView:self.imageScrollView];
+            CGFloat triggerDistance = profile.triggerDistance;
+            CGFloat offsetY = self.imageScrollView.contentOffset.y, height = self.imageScrollView.bounds.size.height;
+
+            BOOL distanceArrive = ABS(point.x - _interactStartPoint.x) < triggerDistance && ABS(velocity.x) < 500;
+            BOOL upArrive = point.y - _interactStartPoint.y > triggerDistance && offsetY <= 1;
+            BOOL downArrive = point.y - _interactStartPoint.y < -triggerDistance && offsetY + height >= MAX(self.imageScrollView.contentSize.height, height) - 1;
+
+            BOOL shouldStart = (upArrive || downArrive) && distanceArrive;
+            if (!shouldStart) return;
+
+            _interactStartPoint = point;
+
+            CGRect startFrame = self.imageScrollView.frame;
+            CGFloat anchorX = point.x / startFrame.size.width, anchorY = point.y / startFrame.size.height;
+            self.imageScrollView.layer.anchorPoint = CGPointMake(anchorX, anchorY);
+            self.imageScrollView.userInteractionEnabled = NO;
+            self.imageScrollView.scrollEnabled = NO;
+            self.imageScrollView.center = point;
+            
+            self.yb_hideToolViews(YES);
+            self.yb_hideStatusBar(NO);
+            self.yb_collectionView().scrollEnabled = NO;
+            [self hideTailoringImageView];
+
+            _interacting = YES;
+        }
+    }
+}
+
+- (void)restoreInteractionWithDuration:(NSTimeInterval)duration {
+    CGSize containerSize = self.yb_containerSize(self.yb_currentOrientation());
+    
+    void (^animations)(void) = ^{
+        self.yb_backView.backgroundColor = [self.yb_backView.backgroundColor colorWithAlphaComponent:1];
+        
+        CGPoint anchorPoint = self.imageScrollView.layer.anchorPoint;
+        self.imageScrollView.center = CGPointMake(containerSize.width * anchorPoint.x, containerSize.height * anchorPoint.y);
+        self.imageScrollView.transform = CGAffineTransformIdentity;
+    };
+    void (^completion)(BOOL finished) = ^(BOOL finished){
+        self.imageScrollView.layer.anchorPoint = CGPointMake(0.5, 0.5);
+        self.imageScrollView.center = CGPointMake(containerSize.width * 0.5, containerSize.height * 0.5);
+        self.imageScrollView.userInteractionEnabled = YES;
+        self.imageScrollView.scrollEnabled = YES;
+        
+        self.yb_hideToolViews(NO);
+        self.yb_hideStatusBar(YES);
+        self.yb_collectionView().scrollEnabled = YES;
+        [self cuttingImage];
+        
+        self->_interactStartPoint = CGPointZero;
+        self->_interacting = NO;
+    };
+    
+    if (duration <= 0) {
+        animations();
+        completion(NO);
+    } else {
+        [UIView animateWithDuration:duration animations:animations completion:completion];
+    }
+}
+
+#pragma mark - <UIScrollViewDelegate>
+
+- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
+    YBIBImageData *data = self.yb_cellData;
+    if (data.imageDidZoomBlock) {
+        data.imageDidZoomBlock(data, scrollView);
+    }
+    
+    CGRect imageViewFrame = self.imageScrollView.imageView.frame;
+    CGFloat width = imageViewFrame.size.width,
+    height = imageViewFrame.size.height,
+    sHeight = scrollView.bounds.size.height,
+    sWidth = scrollView.bounds.size.width;
+    if (height > sHeight) {
+        imageViewFrame.origin.y = 0;
+    } else {
+        imageViewFrame.origin.y = (sHeight - height) / 2.0;
+    }
+    if (width > sWidth) {
+        imageViewFrame.origin.x = 0;
+    } else {
+        imageViewFrame.origin.x = (sWidth - width) / 2.0;
+    }
+    self.imageScrollView.imageView.frame = imageViewFrame;
+}
+
+- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
+    return self.imageScrollView.imageView;
+}
+
+- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
+    YBIBImageData *data = self.yb_cellData;
+    if (data.imageDidScrollBlock) {
+        data.imageDidScrollBlock(data, scrollView);
+    }
+    
+    [self cuttingImage];
+}
+
+- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view {
+    [self hideTailoringImageView];
+}
+
+- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
+    [self hideTailoringImageView];
+}
+
+#pragma mark - <UIGestureRecognizerDelegate>
+
+- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
+    return YES;
+}
+
+#pragma mark - getters
+
+- (YBIBImageScrollView *)imageScrollView {
+    if (!_imageScrollView) {
+        _imageScrollView = [YBIBImageScrollView new];
+        _imageScrollView.delegate = self;
+    }
+    return _imageScrollView;
+}
+
+- (UIImageView *)tailoringImageView {
+    if (!_tailoringImageView) {
+        _tailoringImageView = [UIImageView new];
+        _tailoringImageView.contentMode = UIViewContentModeScaleAspectFit;
+    }
+    return _tailoringImageView;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageData+Internal.h

@@ -0,0 +1,63 @@
+//
+//  YBIBImageData+Internal.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/12.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBImageData.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef NS_ENUM(NSInteger, YBIBImageLoadingStatus) {
+    YBIBImageLoadingStatusNone,
+    YBIBImageLoadingStatusCompressing,
+    YBIBImageLoadingStatusDecoding,
+    YBIBImageLoadingStatusQuerying,
+    YBIBImageLoadingStatusProcessing,
+    YBIBImageLoadingStatusDownloading,
+    YBIBImageLoadingStatusReadingPHAsset,
+};
+
+@class YBIBImageData;
+
+@protocol YBIBImageDataDelegate <NSObject>
+@required
+
+- (void)yb_imageData:(YBIBImageData *)data startLoadingWithStatus:(YBIBImageLoadingStatus)status;
+
+- (void)yb_imageIsInvalidForData:(YBIBImageData *)data;
+
+- (void)yb_imageData:(YBIBImageData *)data readyForImage:(__kindof UIImage *)image;
+
+- (void)yb_imageData:(YBIBImageData *)data readyForThumbImage:(__kindof UIImage *)image;
+
+- (void)yb_imageData:(YBIBImageData *)data readyForCompressedImage:(__kindof UIImage *)image;
+
+- (void)yb_imageData:(YBIBImageData *)data downloadProgress:(CGFloat)progress;
+
+- (void)yb_imageDownloadFailedForData:(YBIBImageData *)data;
+
+@end
+
+@interface YBIBImageData ()
+
+@property (nonatomic, weak) id<YBIBImageDataDelegate> delegate;
+
+/// The status of asynchronous tasks.
+@property (nonatomic, assign) YBIBImageLoadingStatus loadingStatus;
+
+/// The origin image.
+@property (nonatomic, strong) UIImage *originImage;
+
+/// The image compressed by 'originImage' if need.
+@property (nonatomic, strong) UIImage *compressedImage;
+
+- (BOOL)shouldCompress;
+
+- (void)cuttingImageToRect:(CGRect)rect complete:(void(^)(UIImage * _Nullable image))complete;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageData.h

@@ -0,0 +1,157 @@
+//
+//  YBIBImageData.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/5.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import <Photos/Photos.h>
+#import "YBIBDataProtocol.h"
+#import "YBIBImageLayout.h"
+#import "YBIBImageCache.h"
+#import "YBIBInteractionProfile.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class YBIBImageData;
+
+/// 获取 NSData 的闭包
+typedef NSData * _Nullable (^YBIBImageDataBlock)(void);
+
+/// 获取 UIImage 的闭包
+typedef UIImage * _Nullable (^YBIBImageBlock)(void);
+
+/// 修改 NSURLRequest 并返回的闭包
+typedef NSURLRequest * _Nullable (^YBIBRequestModifierBlock)(YBIBImageData *imageData, NSURLRequest *request);
+
+/// 根据图片逻辑像素和 scale 判断是否需要预解码的闭包
+typedef BOOL (^YBIBPreDecodeDecisionBlock)(YBIBImageData *imageData, CGSize imageSize, CGFloat scale);
+
+/// 修改 UIImage 并返回的闭包
+typedef void (^YBIBImageModifierBlock)(YBIBImageData *imageData, UIImage *image, void(^completion)(UIImage *processedImage));
+
+/// 单击事件的处理闭包
+typedef void (^YBIBImageSingleTouchBlock)(YBIBImageData *imageData);
+
+/// 内部图片滚动视图状态回调闭包
+typedef void (^YBIBImageScrollViewStatusBlock)(YBIBImageData *imageData, UIScrollView *scrollView);
+
+
+/**
+ 图片数据类，承担配置数据和处理数据的责任
+ */
+@interface YBIBImageData : NSObject <YBIBDataProtocol>
+
+/// 本地图片名字
+@property (nonatomic, copy, nullable) NSString *imageName;
+
+/// 本地图片路径
+@property (nonatomic, copy, nullable) NSString *imagePath;
+
+/// 本地图片字节码，返回 NSData
+@property (nonatomic, copy, nullable) YBIBImageDataBlock imageData;
+
+/// 本地图片，返回 UIImage 及其衍生类 (若不是遵循'YYAnimatedImage'协议的类型，将失去对动图和拓展格式的支持)
+@property (nonatomic, copy, nullable) YBIBImageBlock image;
+
+/// 网络图片资源
+@property (nonatomic, copy, nullable) NSURL *imageURL;
+
+/// 修改 NSURLRequest 并返回
+@property (nonatomic, copy, nullable) YBIBRequestModifierBlock requestModifier;
+
+/// 相册图片资源
+@property (nonatomic, strong, nullable) PHAsset *imagePHAsset;
+
+/// 投影视图，当前数据模型对应外界业务的 UIView (通常为 UIImageView)，做转场动效用
+@property (nonatomic, weak, nullable) __kindof UIView *projectiveView;
+
+/// 预览图/缩约图，注意若这个图片过大会导致内存压力（若 projectiveView 存在且是 UIImageView 类型将会自动获取缩约图）
+@property (nonatomic, strong, nullable) UIImage *thumbImage;
+
+/// 预览图/缩约图 URL，缓存中未找到则忽略（若 projectiveView 存在且是 UIImageView 类型将会自动获取缩约图）
+@property (nonatomic, copy, nullable) NSURL *thumbURL;
+
+/// 是否允许保存到相册
+@property (nonatomic, assign) BOOL allowSaveToPhotoAlbum;
+
+/// 根据图片信息判断是否需要预解码
+@property (nonatomic, copy, nullable) YBIBPreDecodeDecisionBlock preDecodeDecision;
+
+/// 是否异步预解码，默认为 YES
+@property (nonatomic, assign) BOOL shouldPreDecodeAsync;
+
+/// 压缩物理像素界限大小，当图片超过这个值将会被压缩显示，默认为 4096*4096
+@property (nonatomic, assign) CGFloat compressingSize;
+
+/// 触发裁剪的缩放比例，必须大于等于 1，默认情况内部会动态计算 (仅当图片需要压缩显示时有效)
+@property (nonatomic, assign) CGFloat cuttingZoomScale;
+
+/**
+ 判断图片是否需要压缩显示
+ */
+- (BOOL)shouldCompressWithImage:(UIImage *)image;
+
+/**
+ 修改原始图片并返回处理后的图片 (特别注意当 image 是大图的时候，避免 OOM)
+ Example:
+    [... setImageModifier:^(YBIBImageData *imageData, UIImage * _Nonnull image, void (^ _Nonnull completion)(UIImage * _Nonnull)) {
+        //step 1 : Add watermark, trademark, etc. (Sync or async).
+        ... processing code ...
+        //step 2 : Return the processed UIImage.
+        completion(image);
+    }];
+ */
+@property (nonatomic, copy, nullable) YBIBImageModifierBlock originImageModifier;
+
+/// 修改压缩图片并返回处理后的图片 (仅在当前图片需要被压缩时有效)
+@property (nonatomic, copy, nullable) YBIBImageModifierBlock compressedImageModifier;
+
+/// 修改裁剪图片并返回处理后的图片 (仅在当前图片需要被裁剪时有效)
+@property (nonatomic, copy, nullable) YBIBImageModifierBlock cuttedImageModifier;
+
+/// 预留属性可随意使用
+@property (nonatomic, strong, nullable) id extraData;
+
+/// 手势交互动效配置文件
+@property (nonatomic, strong) YBIBInteractionProfile *interactionProfile;
+
+/// 单击的处理，默认是退出图片浏览器
+@property (nonatomic, copy, nullable) YBIBImageSingleTouchBlock singleTouchBlock;
+
+/// 图片滚动的回调
+@property (nonatomic, copy, nullable) YBIBImageScrollViewStatusBlock imageDidScrollBlock;
+
+/// 图片缩放的回调
+@property (nonatomic, copy, nullable) YBIBImageScrollViewStatusBlock imageDidZoomBlock;
+
+/// 图片布局类 (赋值可自定义)
+@property (nonatomic, strong) id<YBIBImageLayout> layout;
+/// 默认图片布局类 (可配置其属性)
+@property (nonatomic, weak, readonly) YBIBImageLayout *defaultLayout;
+
+/**
+ 终止处理数据程序
+ */
+- (void)stopLoading;
+
+/**
+ 清除缓存的数据
+ */
+- (void)clearCache;
+
+/**
+ 加载数据，一般不需要调用这个方法，当该数据对象做了数据更新时调用
+ */
+- (void)loadData;
+
+/// 处理后的原始图片
+@property (nonatomic, strong, readonly) UIImage *originImage;
+
+/// 处理后的压缩图片
+@property (nonatomic, strong, readonly) UIImage *compressedImage;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageData.m

@@ -0,0 +1,695 @@
+//
+//  YBIBImageData.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/5.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBImage.h"
+#import "YBIBImageData.h"
+#import "YBIBImageCell.h"
+#import "YBIBPhotoAlbumManager.h"
+#import "YBIBImageData+Internal.h"
+#import "YBIBUtilities.h"
+#import "YBIBImageCache+Internal.h"
+#import "YBIBSentinel.h"
+#import "YBIBCopywriter.h"
+#import <AssetsLibrary/AssetsLibrary.h>
+
+extern CGImageRef YYCGImageCreateDecodedCopy(CGImageRef imageRef, BOOL decodeForDisplay);
+
+static dispatch_queue_t YBIBImageProcessingQueue(void) {
+    static dispatch_queue_t queue;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        queue = dispatch_queue_create("com.yangbo.imagebrowser.imageprocessing", DISPATCH_QUEUE_CONCURRENT);
+    });
+    return queue;
+}
+
+@implementation YBIBImageData {
+    __weak id _downloadToken;
+    YBIBSentinel *_cuttingSentinel;
+    /// Stop processing tasks when in freeze.
+    BOOL _freezing;
+}
+
+#pragma mark - life cycle
+
+- (void)dealloc {
+    if (_downloadToken && [self.yb_webImageMediator() respondsToSelector:@selector(yb_cancelTaskWithDownloadToken:)]) {
+        [self.yb_webImageMediator() yb_cancelTaskWithDownloadToken:_downloadToken];
+    }
+    [self.imageCache removeForKey:self.cacheKey];
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        [self initValue];
+    }
+    return self;
+}
+
+- (void)initValue {
+    _defaultLayout = _layout = [YBIBImageLayout new];
+    _loadingStatus = YBIBImageLoadingStatusNone;
+    _compressingSize = 4096 * 4096;
+    _shouldPreDecodeAsync = YES;
+    _freezing = NO;
+    _cuttingSentinel = [YBIBSentinel new];
+    _interactionProfile = [YBIBInteractionProfile new];
+    _allowSaveToPhotoAlbum = YES;
+}
+
+#pragma mark - load data
+
+- (void)loadData {
+    _freezing = NO;
+    
+    // Avoid handling asynchronous tasks repeatedly.
+    if (self.loadingStatus != YBIBImageLoadingStatusNone) {
+        [self loadThumbImage];
+        self.loadingStatus = self.loadingStatus;
+        return;
+    }
+    
+    if (self.originImage) {
+        [self loadOriginImage];
+    } else if (self.imageName || self.imagePath || self.imageData) {
+        [self loadYBImage];
+    } else if (self.image) {
+        [self loadImageBlock];
+    } else if (self.imageURL) {
+        [self loadThumbImage];
+        [self loadURL];
+    } else if (self.imagePHAsset) {
+        [self loadThumbImage];
+        [self loadPHAsset];
+    } else {
+        [self.delegate yb_imageIsInvalidForData:self];
+    }
+}
+
+- (void)loadOriginImage {
+    if (_freezing) return;
+    if (!self.originImage) return;
+    
+    if ([self shouldCompress]) {
+        if (self.compressedImage) {
+            [self.delegate yb_imageData:self readyForCompressedImage:self.compressedImage];
+        } else {
+            [self loadThumbImage];
+            [self loadOriginImage_compress];
+        }
+    } else {
+        [self.delegate yb_imageData:self readyForImage:self.originImage];
+    }
+}
+- (void)loadOriginImage_compress {
+    if (_freezing) return;
+    if (!self.originImage) return;
+    
+    self.loadingStatus = YBIBImageLoadingStatusCompressing;
+    __weak typeof(self) wSelf = self;
+    CGSize size = [self bestSizeOfCompressing];
+
+    YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), ^{
+        if (self->_freezing) {
+            self.loadingStatus = YBIBImageLoadingStatusNone;
+            return;
+        }
+        // Ensure the best display effect.
+        UIGraphicsBeginImageContextWithOptions(size, NO, UIScreen.mainScreen.scale);
+        [self.originImage drawInRect:CGRectMake(0, 0, size.width, size.height)];
+        if (self->_freezing) {
+            UIGraphicsEndImageContext();
+            self.loadingStatus = YBIBImageLoadingStatusNone;
+            return;
+        }
+        UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
+        UIGraphicsEndImageContext();
+        
+        YBIB_DISPATCH_ASYNC_MAIN(^{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            
+            self.loadingStatus = YBIBImageLoadingStatusNone;
+            
+            [self modifyImageWithModifier:self.compressedImageModifier image:resultImage completion:^(UIImage *processedImage) {
+                __strong typeof(wSelf) self = wSelf;
+                if (!self) return;
+                self.compressedImage = processedImage ?: self.originImage;
+                [self.delegate yb_imageData:self readyForCompressedImage:self.compressedImage];
+            }];
+        })
+    })
+}
+
+- (void)loadYBImage {
+    if (_freezing) return;
+    NSString *name = self.imageName.copy;
+    NSString *path = self.imagePath.copy;
+    NSData *data = self.imageData ? self.imageData().copy : nil;
+    if (name.length == 0 && path.length == 0 && data.length == 0) return;
+    
+    YBImageDecodeDecision decision = [self defaultDecodeDecision];
+    
+    __block YBImage *image;
+    __weak typeof(self) wSelf = self;
+    void(^dealBlock)(void) = ^{
+        if (name.length > 0) {
+            image = [YBImage imageNamed:name decodeDecision:decision];
+        } else if (path.length > 0) {
+            image = [YBImage imageWithContentsOfFile:path decodeDecision:decision];
+        } else if (data.length > 0) {
+            image = [YBImage imageWithData:data scale:UIScreen.mainScreen.scale decodeDecision:decision];
+        }
+        YBIB_DISPATCH_ASYNC_MAIN(^{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            self.loadingStatus = YBIBImageLoadingStatusNone;
+            if (image) {
+                [self setOriginImageAndLoadWithImage:image];
+            } else {
+                [self.delegate yb_imageIsInvalidForData:self];
+            }
+        })
+    };
+    
+    if (self.shouldPreDecodeAsync) {
+        [self loadThumbImage];
+        self.loadingStatus = YBIBImageLoadingStatusDecoding;
+        YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), dealBlock)
+    } else {
+        self.loadingStatus = YBIBImageLoadingStatusDecoding;
+        dealBlock();
+    }
+}
+
+- (void)loadImageBlock {
+    if (_freezing) return;
+    __block UIImage *image = self.image ? self.image() : nil;
+    if (!image) return;
+    
+    BOOL shouldPreDecode = self.preDecodeDecision ? self.preDecodeDecision(self, image.size, image.scale) : ![self shouldCompressWithImage:image];
+    
+    __weak typeof(self) wSelf = self;
+    void(^dealBlock)(void) = ^{
+        // Do not need to decode If 'image' conformed 'YYAnimatedImage'. (Not entirely accurate.)
+        if (![image conformsToProtocol:@protocol(YYAnimatedImage)]) {
+            CGImageRef cgImage = YYCGImageCreateDecodedCopy(image.CGImage, shouldPreDecode);
+            image = [UIImage imageWithCGImage:cgImage scale:image.scale orientation:image.imageOrientation];
+            if (cgImage) CGImageRelease(cgImage);
+        }
+        YBIB_DISPATCH_ASYNC_MAIN(^{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            self.loadingStatus = YBIBImageLoadingStatusNone;
+            [self setOriginImageAndLoadWithImage:image];
+        })
+    };
+    
+    if (self.shouldPreDecodeAsync) {
+        [self loadThumbImage];
+        self.loadingStatus = YBIBImageLoadingStatusDecoding;
+        YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), dealBlock)
+    } else {
+        self.loadingStatus = YBIBImageLoadingStatusDecoding;
+        dealBlock();
+    }
+}
+
+- (void)loadURL {
+    if (!self.imageURL || self.imageURL.absoluteString.length == 0) return;
+    [self loadURL_queryCache];
+}
+- (void)loadURL_queryCache {
+    if (_freezing) return;
+    if (!self.imageURL || self.imageURL.absoluteString.length == 0) return;
+    
+    YBImageDecodeDecision decision = [self defaultDecodeDecision];
+    
+    self.loadingStatus = YBIBImageLoadingStatusQuerying;
+    [self.yb_webImageMediator() yb_queryCacheOperationForKey:self.imageURL completed:^(UIImage * _Nullable image, NSData * _Nullable imageData) {
+        if (!imageData || imageData.length == 0) {
+            YBIB_DISPATCH_ASYNC_MAIN(^{
+                self.loadingStatus = YBIBImageLoadingStatusNone;
+                [self loadURL_download];
+            })
+            return;
+        }
+        
+        YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), ^{
+            if (self->_freezing) {
+                self.loadingStatus = YBIBImageLoadingStatusNone;
+                return;
+            }
+            YBImage *image = [YBImage imageWithData:imageData scale:UIScreen.mainScreen.scale decodeDecision:decision];
+            __weak typeof(self) wSelf = self;
+            YBIB_DISPATCH_ASYNC_MAIN(^{
+                __strong typeof(wSelf) self = wSelf;
+                if (!self) return;
+                self.loadingStatus = YBIBImageLoadingStatusNone;
+                if (image) {    // Maybe the image data is invalid.
+                    [self setOriginImageAndLoadWithImage:image];
+                } else {
+                    [self loadURL_download];
+                }
+            })
+        })
+    }];
+}
+- (void)loadURL_download {
+    if (_freezing) return;
+    if (!self.imageURL || self.imageURL.absoluteString.length == 0) return;
+    
+    YBImageDecodeDecision decision = [self defaultDecodeDecision];
+    
+    self.loadingStatus = YBIBImageLoadingStatusDownloading;
+    __weak typeof(self) wSelf = self;
+    _downloadToken = [self.yb_webImageMediator() yb_downloadImageWithURL:self.imageURL requestModifier:^NSURLRequest * _Nullable(NSURLRequest * _Nonnull request) {
+        return self.requestModifier ? self.requestModifier(self, request) : request;
+    } progress:^(NSInteger receivedSize, NSInteger expectedSize) {
+        CGFloat progress = receivedSize * 1.0 / expectedSize ?: 0;
+        YBIB_DISPATCH_ASYNC_MAIN(^{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            [self.delegate yb_imageData:self downloadProgress:progress];
+        })
+    } success:^(NSData * _Nullable imageData, BOOL finished) {
+        if (!finished) return;
+        
+        YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), ^{
+            if (self->_freezing) {
+                self.loadingStatus = YBIBImageLoadingStatusNone;
+                return;
+            }
+            YBImage *image = [YBImage imageWithData:imageData scale:UIScreen.mainScreen.scale decodeDecision:decision];
+            YBIB_DISPATCH_ASYNC_MAIN(^{
+                __strong typeof(wSelf) self = wSelf;
+                if (!self) return;
+                [self.yb_webImageMediator() yb_storeToDiskWithImageData:imageData forKey:self.imageURL];
+                self.loadingStatus = YBIBImageLoadingStatusNone;
+                if (image) {
+                    [self setOriginImageAndLoadWithImage:image];
+                } else {
+                    [self.delegate yb_imageIsInvalidForData:self];
+                }
+            })
+        })
+    } failed:^(NSError * _Nullable error, BOOL finished) {
+        if (!finished) return;
+        __strong typeof(wSelf) self = wSelf;
+        if (!self) return;
+        self.loadingStatus = YBIBImageLoadingStatusNone;
+        [self.delegate yb_imageDownloadFailedForData:self];
+    }];
+}
+
+- (void)loadPHAsset {
+    if (_freezing) return;
+    if (!self.imagePHAsset) return;
+    
+    YBImageDecodeDecision decision = [self defaultDecodeDecision];
+    
+    self.loadingStatus = YBIBImageLoadingStatusReadingPHAsset;
+    YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), ^{
+        [YBIBPhotoAlbumManager getImageDataWithPHAsset:self.imagePHAsset completion:^(NSData * _Nullable data) {
+            if (self->_freezing) {
+                self.loadingStatus = YBIBImageLoadingStatusNone;
+                return;
+            }
+            YBImage *image = [YBImage imageWithData:data scale:UIScreen.mainScreen.scale decodeDecision:decision];
+            __weak typeof(self) wSelf = self;
+            YBIB_DISPATCH_ASYNC_MAIN(^{
+                __strong typeof(wSelf) self = wSelf;
+                if (!self) return;
+                
+                self.loadingStatus = YBIBImageLoadingStatusNone;
+                if (image) {
+                    [self setOriginImageAndLoadWithImage:image];
+                } else {
+                    [self.delegate yb_imageIsInvalidForData:self];
+                }
+            })
+        }];
+    })
+}
+
+- (void)loadThumbImage {
+    if (_freezing) return;
+    if (self.thumbImage) {
+        [self.delegate yb_imageData:self readyForThumbImage:self.thumbImage];
+    } else if (self.thumbURL) {
+        __weak typeof(self) wSelf = self;
+        [self.yb_webImageMediator() yb_queryCacheOperationForKey:self.thumbURL completed:^(UIImage * _Nullable image, NSData * _Nullable imageData) {
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            
+            UIImage *thumbImage;
+            if (image) {
+                thumbImage = image;
+            } else if (imageData) {
+                thumbImage = [UIImage imageWithData:imageData];
+            }
+            // If the target image is ready, ignore the thumb image.
+            BOOL shouldIgnore = [self shouldCompress] ? (self.compressedImage != nil) : (self.originImage != nil);
+            if (!shouldIgnore && thumbImage) {
+                [self.delegate yb_imageData:self readyForThumbImage:thumbImage];
+            }
+        }];
+    } else if (self.projectiveView && [self.projectiveView isKindOfClass:UIImageView.self] && ((UIImageView *)self.projectiveView).image) {
+        UIImage *thumbImage = ((UIImageView *)self.projectiveView).image;
+        [self.delegate yb_imageData:self readyForThumbImage:thumbImage];
+    }
+}
+
+#pragma mark - internal
+
+- (void)cuttingImageToRect:(CGRect)rect complete:(void (^)(UIImage * _Nullable))complete {
+    if (_freezing) return;
+    if (!self.originImage) return;
+    
+    int32_t value = [_cuttingSentinel increase];
+    BOOL (^isCancelled)(void) = ^BOOL(void) {
+        if (self->_freezing) return YES;
+        return value != self->_cuttingSentinel.value;
+    };
+    
+    YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), ^{
+        if (isCancelled()) {
+            complete(nil);
+            return;
+        }
+        CGFloat scale = self.originImage.scale;
+        CGFloat width = self.originImage.size.width;
+        CGFloat height = self.originImage.size.height;
+        
+        BOOL reverseWidthHeight = NO;
+        CGAffineTransform transform = CGAffineTransformIdentity;
+        switch (self.originImage.imageOrientation) {
+            case UIImageOrientationDown:
+            case UIImageOrientationDownMirrored:
+                CGAffineTransformTranslate(CGAffineTransformMakeRotation(-M_PI), -width, -height);
+                break;
+            case UIImageOrientationLeft:
+            case UIImageOrientationLeftMirrored:
+                transform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(M_PI_2), 0, -height);
+                reverseWidthHeight = YES;
+                break;
+            case UIImageOrientationRight:
+            case UIImageOrientationRightMirrored:
+                transform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(-M_PI_2), -width, 0);
+                reverseWidthHeight = YES;
+                break;
+            default: break;
+        }
+        transform = CGAffineTransformScale(transform, scale, scale);
+        CGRect correctRect = CGRectApplyAffineTransform(rect, transform);
+        CGImageRef cgImage = CGImageCreateWithImageInRect(self.originImage.CGImage, correctRect);
+        
+        if (isCancelled()) {
+            complete(nil);
+            if (cgImage) CGImageRelease(cgImage);
+            return;
+        }
+        CGFloat cgWidth = reverseWidthHeight ? CGImageGetHeight(cgImage) : CGImageGetWidth(cgImage);
+        CGFloat cgHeight = reverseWidthHeight ? CGImageGetWidth(cgImage) : CGImageGetHeight(cgImage);
+        CGSize size = [self bestSizeOfCuttingWithOriginSize:CGSizeMake(cgWidth / scale, cgHeight / scale)];
+        UIImage *tmpImage = [UIImage imageWithCGImage:cgImage scale:self.originImage.scale orientation:self.originImage.imageOrientation];
+        if (isCancelled()) {
+            complete(nil);
+            if (cgImage) CGImageRelease(cgImage);
+            return;
+        }
+        
+        // Ensure the best display effect.
+        UIGraphicsBeginImageContextWithOptions(size, NO, UIScreen.mainScreen.scale);
+        [tmpImage drawInRect:CGRectMake(0, 0, size.width, size.height)];
+        if (isCancelled()) {
+            complete(nil);
+            UIGraphicsEndImageContext();
+            if (cgImage) CGImageRelease(cgImage);
+            return;
+        }
+        UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
+        UIGraphicsEndImageContext();
+        if (cgImage) CGImageRelease(cgImage);
+        
+        __weak typeof(self) wSelf = self;
+        YBIB_DISPATCH_ASYNC_MAIN(^{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            
+            [self modifyImageWithModifier:self.cuttedImageModifier image:resultImage completion:^(UIImage *image) {
+                __strong typeof(wSelf) self = wSelf;
+                if (!self) return;
+                complete(image);
+            }];
+        })
+    })
+}
+
+- (BOOL)shouldCompress {
+    return [self shouldCompressWithImage:self.originImage];
+}
+
+#pragma mark - public
+
+- (BOOL)shouldCompressWithImage:(UIImage *)image {
+    if (!image) return NO;
+    return [self shouldCompressWithImageSize:image.size scale:image.scale];
+}
+
+- (void)stopLoading {
+    _freezing = YES;
+    self.loadingStatus = YBIBImageLoadingStatusNone;
+}
+
+- (void)clearCache {
+    [self.imageCache removeForKey:self.cacheKey];
+}
+
+#pragma mark - private
+
+/// 'size': logic pixel.
+- (BOOL)shouldCompressWithImageSize:(CGSize)size scale:(CGFloat)scale {
+    return size.width * scale * size.height * scale > self.compressingSize;
+}
+
+/// Logic pixel.
+- (CGSize)bestSizeOfCompressing {
+    if (!self.originImage) return CGSizeZero;
+    UIDeviceOrientation orientation = self.yb_currentOrientation();
+    CGRect imageViewFrame = [self.layout yb_imageViewFrameWithContainerSize:self.yb_containerSize(orientation) imageSize:self.originImage.size orientation:orientation];
+    return imageViewFrame.size;
+}
+
+/// Logic pixel.
+- (CGSize)bestSizeOfCuttingWithOriginSize:(CGSize)originSize {
+    CGSize containerSize = self.yb_containerSize(self.yb_currentOrientation());
+    CGFloat maxWidth = containerSize.width, maxHeight = containerSize.height;
+    CGFloat oWidth = originSize.width, oHeight = originSize.height;
+    if (maxWidth <= 0 || maxHeight <= 0 || oWidth <= 0 || oHeight <= 0) return CGSizeZero;
+    
+    if (oWidth <= maxWidth && oHeight <= maxHeight) {
+        return originSize;
+    }
+    CGFloat rWidth = 0, rHeight = 0;
+    if (oWidth / maxWidth < oHeight / maxHeight) {
+        rHeight = maxHeight;
+        rWidth = oWidth / oHeight * rHeight;
+    } else {
+        rWidth = maxWidth;
+        rHeight = oHeight / oWidth * rWidth;
+    }
+    return CGSizeMake(rWidth, rHeight);
+}
+
+- (YBImageDecodeDecision)defaultDecodeDecision {
+    __weak typeof(self) wSelf = self;
+    return ^BOOL(CGSize imageSize, CGFloat scale) {
+        __strong typeof(wSelf) self = wSelf;
+        if (!self) return NO;
+        CGSize logicSize = CGSizeMake(imageSize.width / scale, imageSize.height / scale);
+        if (self.preDecodeDecision) return self.preDecodeDecision(self, logicSize, scale);
+        if ([self shouldCompressWithImageSize:logicSize scale:scale]) return NO;
+        return YES;
+    };
+}
+
+- (void)modifyImageWithModifier:(YBIBImageModifierBlock)modifier image:(UIImage *)image completion:(void(^)(UIImage *processedImage))completion {
+    if (modifier) {
+        self.loadingStatus = YBIBImageLoadingStatusProcessing;
+        __weak typeof(self) wSelf = self;
+        modifier(self, image, ^(UIImage *processedImage){
+            // This step is necessary, maybe 'self' is already 'dealloc' if processing code takes too much time.
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            self.loadingStatus = YBIBImageLoadingStatusNone;
+            completion(processedImage);
+        });
+    } else {
+        completion(image);
+    }
+}
+
+- (void)setOriginImageAndLoadWithImage:(UIImage *)image {
+    __weak typeof(self) wSelf = self;
+    [self modifyImageWithModifier:self.originImageModifier image:image completion:^(UIImage *processedImage) {
+        __strong typeof(wSelf) self = wSelf;
+        if (!self) return;
+        self.originImage = processedImage;
+        [self loadOriginImage];
+    }];
+}
+
+- (void)saveToPhotoAlbumCompleteWithError:(nullable NSError *)error {
+    if (error) {
+        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].saveToPhotoAlbumFailed];
+    } else {
+        [self.yb_auxiliaryViewHandler() yb_showCorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].saveToPhotoAlbumSuccess];
+    }
+}
+
+- (void)UIImageWriteToSavedPhotosAlbum_completedWithImage:(UIImage *)image error:(NSError *)error context:(void *)context {
+    [self saveToPhotoAlbumCompleteWithError:error];
+}
+
+- (YBIBImageCache *)imageCache {
+    return self.yb_backView.ybib_imageCache;
+}
+
+#pragma mark - <YBIBDataProtocol>
+
+@synthesize yb_isHideTransitioning = _yb_isHideTransitioning;
+@synthesize yb_currentOrientation = _yb_currentOrientation;
+@synthesize yb_containerSize = _yb_containerSize;
+@synthesize yb_containerView = _yb_containerView;
+@synthesize yb_auxiliaryViewHandler = _yb_auxiliaryViewHandler;
+@synthesize yb_webImageMediator = _yb_webImageMediator;
+@synthesize yb_backView = _yb_backView;
+
+- (nonnull Class)yb_classOfCell {
+    return YBIBImageCell.self;
+}
+
+- (UIView *)yb_projectiveView {
+    return self.projectiveView;
+}
+
+- (CGRect)yb_imageViewFrameWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation {
+    return [self.layout yb_imageViewFrameWithContainerSize:containerSize imageSize:imageSize orientation:orientation];
+}
+
+- (void)yb_preload {
+    if (!self.delegate) {
+        [self loadData];
+    }
+}
+
+- (BOOL)yb_allowSaveToPhotoAlbum {
+    return self.allowSaveToPhotoAlbum;
+}
+
+- (void)yb_saveToPhotoAlbum {
+    void(^saveData)(NSData *) = ^(NSData * _Nonnull data){
+        [[ALAssetsLibrary new] writeImageDataToSavedPhotosAlbum:data metadata:nil completionBlock:^(NSURL *assetURL, NSError *error) {
+            [self saveToPhotoAlbumCompleteWithError:error];
+        }];
+    };
+    void(^saveImage)(UIImage *) = ^(UIImage * _Nonnull image){
+        UIImageWriteToSavedPhotosAlbum(image, self, @selector(UIImageWriteToSavedPhotosAlbum_completedWithImage:error:context:), NULL);
+    };
+    void(^unableToSave)(void) = ^(){
+        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].unableToSave];
+    };
+    
+    [YBIBPhotoAlbumManager getPhotoAlbumAuthorizationSuccess:^{
+        if ([self.originImage conformsToProtocol:@protocol(YYAnimatedImage)] && [self.originImage respondsToSelector:@selector(animatedImageData)] && [self.originImage performSelector:@selector(animatedImageData)]) {
+            NSData *data = [self.originImage performSelector:@selector(animatedImageData)];
+            data ? saveData(data) : unableToSave();
+        } else if (self.originImage) {
+            saveImage(self.originImage);
+        } else if (self.imageURL) {
+            [self.yb_webImageMediator() yb_queryCacheOperationForKey:self.imageURL completed:^(UIImage * _Nullable image, NSData * _Nullable data) {
+                if (data) {
+                    saveData(data);
+                } else if (image) {
+                    saveImage(image);
+                } else {
+                    unableToSave();
+                }
+            }];
+        } else {
+            unableToSave();
+        }
+    } failed:^{
+        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].getPhotoAlbumAuthorizationFailed];
+    }];
+}
+
+#pragma mark - getters & setters
+
+@synthesize delegate = _delegate;
+- (void)setDelegate:(id<YBIBImageDataDelegate>)delegate {
+    _delegate = delegate;
+    if (delegate) {
+        [self loadData];
+    } else {
+        _freezing = YES;
+        // Remove the resident cache if '_delegate' is nil.
+        [self.imageCache removeResidentForKey:self.cacheKey];
+    }
+}
+- (id<YBIBImageDataDelegate>)delegate {
+    // Stop sending data to the '_delegate' if it is transiting.
+    return self.yb_isHideTransitioning() ? nil : _delegate;
+}
+
+- (void)setImageURL:(NSURL *)imageURL {
+    _imageURL = [imageURL isKindOfClass:NSString.class] ? [NSURL URLWithString:(NSString *)imageURL] : imageURL;
+}
+
+- (NSString *)cacheKey {
+    return [NSString stringWithFormat:@"%p", self];
+}
+
+- (void)setOriginImage:(__kindof UIImage *)originImage {
+    // 'image' should be resident if '_delegate' exists.
+    [self.imageCache setImage:originImage type:YBIBImageCacheTypeOrigin forKey:self.cacheKey resident:self->_delegate != nil];
+}
+- (UIImage *)originImage {
+    return [self.imageCache imageForKey:self.cacheKey type:YBIBImageCacheTypeOrigin];
+}
+
+- (void)setCompressedImage:(UIImage *)compressedImage {
+    // 'image' should be resident if '_delegate' exists.
+    [self.imageCache setImage:compressedImage type:YBIBImageCacheTypeCompressed forKey:self.cacheKey resident:_delegate != nil];
+}
+- (UIImage *)compressedImage {
+    return [self.imageCache imageForKey:self.cacheKey type:YBIBImageCacheTypeCompressed];
+}
+
+- (void)setLoadingStatus:(YBIBImageLoadingStatus)loadingStatus {
+    // Ensure thread safety.
+    YBIB_DISPATCH_ASYNC_MAIN(^{
+        self->_loadingStatus = loadingStatus;
+        [self.delegate yb_imageData:self startLoadingWithStatus:loadingStatus];
+    });
+}
+
+- (CGFloat)cuttingZoomScale {
+    if (_cuttingZoomScale >= 1) return _cuttingZoomScale;
+    _cuttingZoomScale = 1.1;
+    if (!self.originImage) return _cuttingZoomScale;
+    CGFloat imagePixel = self.originImage.size.width * self.originImage.size.height * self.originImage.scale * self.originImage.scale;
+    // The larger the image size, the larger the '_cuttingZoomScale', in order to reduce the burden of CPU and memory.
+    CGFloat scale = YBIBLowMemory() ? 0.28 : 0.19;
+    _cuttingZoomScale += (imagePixel / self.compressingSize * scale);
+    return _cuttingZoomScale;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageLayout.h

@@ -0,0 +1,61 @@
+//
+//  YBIBImageLayout.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/12.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol YBIBImageLayout <NSObject>
+@required
+
+/**
+ 计算图片展示的位置
+
+ @param containerSize 容器大小
+ @param imageSize 图片大小 (逻辑像素)
+ @param orientation 图片浏览器的方向
+ @return 图片展示的位置 (frame)
+ */
+- (CGRect)yb_imageViewFrameWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation;
+
+/**
+ 计算最大缩放比例
+
+ @param containerSize 容器大小
+ @param imageSize 图片大小 (逻辑像素)
+ @param orientation 图片浏览器的方向
+ @return 最大缩放比例
+ */
+- (CGFloat)yb_maximumZoomScaleWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation;
+
+@end
+
+typedef NS_ENUM(NSUInteger, YBIBImageFillType) {
+    /// 宽度优先填充满
+    YBIBImageFillTypeFullWidth,
+    /// 完整显示
+    YBIBImageFillTypeCompletely
+};
+
+@interface YBIBImageLayout : NSObject <YBIBImageLayout>
+
+/// 纵向的填充方式，默认 YBIBImageFillTypeCompletely
+@property (nonatomic, assign) YBIBImageFillType verticalFillType;
+
+/// 横向的填充方式，默认 YBIBImageFillTypeFullWidth
+@property (nonatomic, assign) YBIBImageFillType horizontalFillType;
+
+/// 最大缩放比例 (必须大于 1 才有效，若不指定内部会自动计算)
+@property (nonatomic, assign) CGFloat maxZoomScale;
+
+/// 自动计算严格缩放比例后，再乘以这个值作为最终缩放比例，默认 1.5
+@property (nonatomic, assign) CGFloat zoomScaleSurplus;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageLayout.m

@@ -0,0 +1,90 @@
+//
+//  YBIBImageLayout.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/12.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBImageLayout.h"
+
+@implementation YBIBImageLayout
+
+#pragma mark - life cycle
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _verticalFillType = YBIBImageFillTypeCompletely;
+        _horizontalFillType = YBIBImageFillTypeFullWidth;
+        _zoomScaleSurplus = 1.5;
+    }
+    return self;
+}
+
+#pragma mark - private
+
+- (YBIBImageFillType)fillTypeByOrientation:(UIDeviceOrientation)orientation {
+    return UIDeviceOrientationIsLandscape(orientation) ? self.horizontalFillType : self.verticalFillType;
+}
+
+#pragma mark - <YBIBImageLayout>
+
+- (CGRect)yb_imageViewFrameWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation {
+    if (containerSize.width <= 0 || containerSize.height <= 0 || imageSize.width <= 0 || imageSize.height <= 0) return CGRectZero;
+    
+    CGFloat x = 0, y = 0, width = 0, height = 0;
+    switch ([self fillTypeByOrientation:orientation]) {
+        case YBIBImageFillTypeFullWidth: {
+            x = 0;
+            width = containerSize.width;
+            height = containerSize.width * (imageSize.height / imageSize.width);
+            if (imageSize.width / imageSize.height >= containerSize.width / containerSize.height)
+                y = (containerSize.height - height) / 2.0;
+            else
+                y = 0;
+        }
+            break;
+        case YBIBImageFillTypeCompletely: {
+            if (imageSize.width / imageSize.height >= containerSize.width / containerSize.height) {
+                width = containerSize.width;
+                height = containerSize.width * (imageSize.height / imageSize.width);
+                x = 0;
+                y = (containerSize.height - height) / 2.0;
+            } else {
+                height = containerSize.height;
+                width = containerSize.height * (imageSize.width / imageSize.height);
+                x = (containerSize.width - width) / 2.0;
+                y = 0;
+            }
+        }
+            break;
+        default: return CGRectZero;
+    }
+    return CGRectMake(x, y, width, height);
+}
+
+- (CGFloat)yb_maximumZoomScaleWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation {
+    if (self.maxZoomScale >= 1) return self.maxZoomScale;
+    
+    if (containerSize.width <= 0 || containerSize.height <= 0) return 0;
+    
+    CGFloat scale = [UIScreen mainScreen].scale;
+    if (scale <= 0) return 0;
+    
+    CGFloat widthScale = imageSize.width / scale / containerSize.width,
+    heightScale = imageSize.height / scale / containerSize.height,
+    maxScale = 1;
+    switch ([self fillTypeByOrientation:orientation]) {
+        case YBIBImageFillTypeFullWidth:
+            maxScale = widthScale;
+            break;
+        case YBIBImageFillTypeCompletely:
+            maxScale = MAX(widthScale, heightScale);
+            break;
+        default: return 0;
+    }
+    return MAX(maxScale, 1) * self.zoomScaleSurplus;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageScrollView.h

@@ -0,0 +1,32 @@
+//
+//  YBIBImageScrollView.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/10.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBImage.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef NS_ENUM(NSInteger, YBIBScrollImageType) {
+    YBIBScrollImageTypeNone,
+    YBIBScrollImageTypeOriginal,
+    YBIBScrollImageTypeCompressed,
+    YBIBScrollImageTypeThumb
+};
+
+@interface YBIBImageScrollView : UIScrollView
+
+- (void)setImage:(__kindof UIImage *)image type:(YBIBScrollImageType)type;
+
+@property (nonatomic, strong, readonly) YYAnimatedImageView *imageView;
+
+@property (nonatomic, assign) YBIBScrollImageType imageType;
+
+- (void)reset;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBImageScrollView.m

@@ -0,0 +1,64 @@
+//
+//  YBIBImageScrollView.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/10.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBImageScrollView.h"
+
+@interface YBIBImageScrollView ()
+@property (nonatomic, strong) YYAnimatedImageView *imageView;
+@end
+
+@implementation YBIBImageScrollView
+
+#pragma mark - life cycle
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        self.showsHorizontalScrollIndicator = NO;
+        self.showsVerticalScrollIndicator = NO;
+        self.decelerationRate = UIScrollViewDecelerationRateFast;
+        self.maximumZoomScale = 1;
+        self.minimumZoomScale = 1;
+        self.alwaysBounceHorizontal = NO;
+        self.alwaysBounceVertical = NO;
+        self.layer.masksToBounds = NO;
+        if (@available(iOS 11.0, *)) {
+            self.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
+        }
+
+        [self addSubview:self.imageView];
+    }
+    return self;
+}
+
+#pragma mark - public
+
+- (void)setImage:(__kindof UIImage *)image type:(YBIBScrollImageType)type {
+    self.imageView.image = image;
+    self.imageType = type;
+}
+
+- (void)reset {
+    self.zoomScale = 1;
+    self.imageView.image = nil;
+    self.imageView.frame = CGRectZero;
+    self.imageType = YBIBScrollImageTypeNone;
+}
+
+#pragma mark - getters
+
+- (YYAnimatedImageView *)imageView {
+    if (!_imageView) {
+        _imageView = [YYAnimatedImageView new];
+        _imageView.contentMode = UIViewContentModeScaleAspectFill;
+        _imageView.layer.masksToBounds = YES;
+    }
+    return _imageView;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBInteractionProfile.h

@@ -0,0 +1,32 @@
+//
+//  YBIBInteractionProfile.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/30.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBInteractionProfile : NSObject
+
+/// 是否取消手势交互动效
+@property (nonatomic, assign) BOOL disable;
+
+/// 拖动的距离与最大高度的比例，达到这个比例就会出场
+@property (nonatomic, assign) CGFloat dismissScale;
+
+/// 拖动的速度，达到这个值就会出场
+@property (nonatomic, assign) CGFloat dismissVelocityY;
+
+/// 拖动动效复位时的时长
+@property (nonatomic, assign) CGFloat restoreDuration;
+
+/// 拖动触发手势交互动效的起始距离
+@property (nonatomic, assign) CGFloat triggerDistance;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Image/YBIBInteractionProfile.m

@@ -0,0 +1,25 @@
+//
+//  YBIBInteractionProfile.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/30.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBInteractionProfile.h"
+
+@implementation YBIBInteractionProfile
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _disable = NO;
+        _dismissScale = 0.22;
+        _dismissVelocityY = 800;
+        _restoreDuration = 0.15;
+        _triggerDistance = 3;
+    }
+    return self;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Image/YBImage.h

@@ -0,0 +1,89 @@
+//
+//  YBImage.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2018/8/31.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#if __has_include(<YYImage/YYImage.h>)
+#import <YYImage/YYFrameImage.h>
+#import <YYImage/YYSpriteSheetImage.h>
+#import <YYImage/YYImageCoder.h>
+#import <YYImage/YYAnimatedImageView.h>
+#elif __has_include(<YYWebImage/YYImage.h>)
+#import <YYWebImage/YYFrameImage.h>
+#import <YYWebImage/YYSpriteSheetImage.h>
+#import <YYWebImage/YYImageCoder.h>
+#import <YYWebImage/YYAnimatedImageView.h>
+#else
+#import "YYFrameImage.h"
+#import "YYSpriteSheetImage.h"
+#import "YYImageCoder.h"
+#import "YYAnimatedImageView.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+/// 🙄波儿菜：Decide whether should to decode by image size. ('imageSize': physical pixel)
+typedef BOOL(^YBImageDecodeDecision)(CGSize imageSize, CGFloat scale);
+
+/**
+ It is a fully compatible `UIImage` subclass. It extends the UIImage
+ to support animated WebP, APNG and GIF format image data decoding. It also
+ support NSCoding protocol to archive and unarchive multi-frame image data.
+ 
+ If the image is created from multi-frame image data, and you want to play the
+ animation, try replace UIImageView with `YYAnimatedImageView`.
+ 
+ 🙄波儿菜：Copied from 'YYImage' and made some extensions.
+ */
+
+@interface YBImage : UIImage <YYAnimatedImage>
+
++ (nullable __kindof UIImage *)imageNamed:(NSString *)name; // no cache!
++ (nullable YBImage *)imageWithContentsOfFile:(NSString *)path;
++ (nullable YBImage *)imageWithData:(NSData *)data;
++ (nullable YBImage *)imageWithData:(NSData *)data scale:(CGFloat)scale;
+
+/// 🙄波儿菜：Expand methodes.
+/// Start ->
++ (nullable __kindof UIImage *)imageNamed:(NSString *)name decodeDecision:(nullable YBImageDecodeDecision)decodeDecision;
++ (nullable YBImage *)imageWithContentsOfFile:(NSString *)path decodeDecision:(nullable YBImageDecodeDecision)decodeDecision;
++ (nullable YBImage *)imageWithData:(NSData *)data decodeDecision:(nullable YBImageDecodeDecision)decodeDecision;
++ (nullable YBImage *)imageWithData:(NSData *)data scale:(CGFloat)scale decodeDecision:(nullable YBImageDecodeDecision)decodeDecision;
+/// <- End
+
+/**
+ If the image is created from data or file, then the value indicates the data type.
+ */
+@property (nonatomic, readonly) YYImageType animatedImageType;
+
+/**
+ If the image is created from animated image data (multi-frame GIF/APNG/WebP),
+ this property stores the original image data.
+ */
+@property (nullable, nonatomic, readonly) NSData *animatedImageData;
+
+/**
+ The total memory usage (in bytes) if all frame images was loaded into memory.
+ The value is 0 if the image is not created from a multi-frame image data.
+ */
+@property (nonatomic, readonly) NSUInteger animatedImageMemorySize;
+
+/**
+ Preload all frame image to memory.
+ 
+ @discussion Set this property to `YES` will block the calling thread to decode
+ all animation frame image to memory, set to `NO` will release the preloaded frames.
+ If the image is shared by lots of image views (such as emoticon), preload all
+ frames will reduce the CPU cost.
+ 
+ See `animatedImageMemorySize` for memory cost.
+ */
+@property (nonatomic) BOOL preloadAllAnimatedImageFrames;
+
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Image/YBImage.m

@@ -0,0 +1,284 @@
+//
+//  YBImage.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2018/8/31.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import "YBImage.h"
+#import "YBIBImageData.h"
+#import "YBIBUtilities.h"
+
+/**
+ An array of NSNumber objects, shows the best order for path scale search.
+ e.g. iPhone3GS:@[@1,@2,@3] iPhone5:@[@2,@3,@1]  iPhone6 Plus:@[@3,@2,@1]
+ */
+static NSArray *_NSBundlePreferredScales() {
+    static NSArray *scales;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        CGFloat screenScale = [UIScreen mainScreen].scale;
+        if (screenScale <= 1) {
+            scales = @[@1,@2,@3];
+        } else if (screenScale <= 2) {
+            scales = @[@2,@3,@1];
+        } else {
+            scales = @[@3,@2,@1];
+        }
+    });
+    return scales;
+}
+
+/**
+ Add scale modifier to the file name (without path extension),
+ From @"name" to @"name@2x".
+ 
+ e.g.
+ <table>
+ <tr><th>Before     </th><th>After(scale:2)</th></tr>
+ <tr><td>"icon"     </td><td>"icon@2x"     </td></tr>
+ <tr><td>"icon "    </td><td>"icon @2x"    </td></tr>
+ <tr><td>"icon.top" </td><td>"icon.top@2x" </td></tr>
+ <tr><td>"/p/name"  </td><td>"/p/name@2x"  </td></tr>
+ <tr><td>"/path/"   </td><td>"/path/"      </td></tr>
+ </table>
+ 
+ @param scale Resource scale.
+ @return String by add scale modifier, or just return if it's not end with file name.
+ */
+static NSString *_NSStringByAppendingNameScale(NSString *string, CGFloat scale) {
+    if (!string) return nil;
+    if (fabs(scale - 1) <= __FLT_EPSILON__ || string.length == 0 || [string hasSuffix:@"/"]) return string.copy;
+    return [string stringByAppendingFormat:@"@%@x", @(scale)];
+}
+
+/**
+ Return the path scale.
+ 
+ e.g.
+ <table>
+ <tr><th>Path            </th><th>Scale </th></tr>
+ <tr><td>"icon.png"      </td><td>1     </td></tr>
+ <tr><td>"icon@2x.png"   </td><td>2     </td></tr>
+ <tr><td>"icon@2.5x.png" </td><td>2.5   </td></tr>
+ <tr><td>"icon@2x"       </td><td>1     </td></tr>
+ <tr><td>"icon@2x..png"  </td><td>1     </td></tr>
+ <tr><td>"icon@2x.png/"  </td><td>1     </td></tr>
+ </table>
+ */
+static CGFloat _NSStringPathScale(NSString *string) {
+    if (string.length == 0 || [string hasSuffix:@"/"]) return 1;
+    NSString *name = string.stringByDeletingPathExtension;
+    __block CGFloat scale = 1;
+    
+    NSRegularExpression *pattern = [NSRegularExpression regularExpressionWithPattern:@"@[0-9]+\\.?[0-9]*x$" options:NSRegularExpressionAnchorsMatchLines error:nil];
+    [pattern enumerateMatchesInString:name options:kNilOptions range:NSMakeRange(0, name.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
+        if (result.range.location >= 3) {
+            scale = [string substringWithRange:NSMakeRange(result.range.location + 1, result.range.length - 2)].doubleValue;
+        }
+    }];
+    
+    return scale;
+}
+
+
+@implementation YBImage {
+    YYImageDecoder *_decoder;
+    NSArray *_preloadedFrames;
+    dispatch_semaphore_t _preloadedLock;
+    NSUInteger _bytesPerFrame;
+}
+
++ (__kindof UIImage *)imageNamed:(NSString *)name {
+    return [self imageNamed:name decodeDecision:nil];
+}
++ (__kindof UIImage *)imageNamed:(NSString *)name decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
+    if (name.length == 0) return nil;
+    if ([name hasSuffix:@"/"]) return nil;
+    
+    NSString *res = name.stringByDeletingPathExtension;
+    NSString *ext = name.pathExtension;
+    NSString *path = nil;
+    CGFloat scale = 1;
+    
+    // If no extension, guess by system supported (same as UIImage).
+    NSArray *exts = ext.length > 0 ? @[ext] : @[@"", @"png", @"jpeg", @"jpg", @"gif", @"webp", @"apng"];
+    NSArray *scales = _NSBundlePreferredScales();
+    for (int s = 0; s < scales.count; s++) {
+        scale = ((NSNumber *)scales[s]).floatValue;
+        NSString *scaledName = _NSStringByAppendingNameScale(res, scale);
+        for (NSString *e in exts) {
+            path = [[NSBundle mainBundle] pathForResource:scaledName ofType:e];
+            if (path) break;
+        }
+        if (path) break;
+    }
+    if (path.length == 0) {
+        // 🙄波儿菜：Assets.xcassets supported.
+        return [super imageNamed:name];
+    }
+    
+    NSData *data = [NSData dataWithContentsOfFile:path];
+    if (data.length == 0) return nil;
+    
+    return [[self alloc] initWithData:data scale:scale decodeDecision:decodeDecision];
+}
+
++ (YBImage *)imageWithContentsOfFile:(NSString *)path {
+    return [self imageWithContentsOfFile:path decodeDecision:nil];
+}
++ (YBImage *)imageWithContentsOfFile:(NSString *)path decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
+    return [[self alloc] initWithContentsOfFile:path decodeDecision:decodeDecision];
+}
+
++ (YBImage *)imageWithData:(NSData *)data {
+    return [self imageWithData:data decodeDecision:nil];
+}
++ (YBImage *)imageWithData:(NSData *)data decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
+    return [[self alloc] initWithData:data decodeDecision:decodeDecision];
+}
+
++ (YBImage *)imageWithData:(NSData *)data scale:(CGFloat)scale {
+    return [self imageWithData:data scale:scale decodeDecision:nil];
+}
++ (YBImage *)imageWithData:(NSData *)data scale:(CGFloat)scale decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
+    return [[self alloc] initWithData:data scale:scale decodeDecision:decodeDecision];
+}
+
+- (instancetype)initWithContentsOfFile:(NSString *)path {
+    return [self initWithContentsOfFile:path decodeDecision:nil];
+}
+- (instancetype)initWithContentsOfFile:(NSString *)path decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
+    NSData *data = [NSData dataWithContentsOfFile:path];
+    return [self initWithData:data scale:_NSStringPathScale(path) decodeDecision:decodeDecision];
+}
+
+- (instancetype)initWithData:(NSData *)data {
+    return [self initWithData:data decodeDecision:nil];
+}
+- (instancetype)initWithData:(NSData *)data decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
+    return [self initWithData:data scale:1 decodeDecision:decodeDecision];
+}
+
+- (instancetype)initWithData:(NSData *)data scale:(CGFloat)scale {
+    return [self initWithData:data scale:scale decodeDecision:nil];
+}
+- (instancetype)initWithData:(NSData *)data scale:(CGFloat)scale decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
+    if (data.length == 0) return nil;
+    if (scale <= 0) scale = [UIScreen mainScreen].scale;
+    _preloadedLock = dispatch_semaphore_create(1);
+    @autoreleasepool {
+        YYImageDecoder *decoder = [YYImageDecoder decoderWithData:data scale:scale];
+        
+        // 🙄波儿菜：Determine whether should to decode.
+        BOOL decodeForDisplay = YES;
+        if (decodeDecision) {
+            decodeForDisplay = decodeDecision(CGSizeMake(decoder.width, decoder.height), decoder.scale ?: 1);
+        }
+        
+        YYImageFrame *frame = [decoder frameAtIndex:0 decodeForDisplay:decodeForDisplay];
+        UIImage *image = frame.image;
+        if (!image) return nil;
+        self = [self initWithCGImage:image.CGImage scale:decoder.scale orientation:image.imageOrientation];
+        if (!self) return nil;
+        _animatedImageType = decoder.type;
+        if (decoder.frameCount > 1) {
+            _decoder = decoder;
+            _bytesPerFrame = CGImageGetBytesPerRow(image.CGImage) * CGImageGetHeight(image.CGImage);
+            _animatedImageMemorySize = _bytesPerFrame * decoder.frameCount;
+        }
+        self.yy_isDecodedForDisplay = YES;
+    }
+    return self;
+}
+
+- (NSData *)animatedImageData {
+    return _decoder.data;
+}
+
+- (void)setPreloadAllAnimatedImageFrames:(BOOL)preloadAllAnimatedImageFrames {
+    if (_preloadAllAnimatedImageFrames != preloadAllAnimatedImageFrames) {
+        if (preloadAllAnimatedImageFrames && _decoder.frameCount > 0) {
+            NSMutableArray *frames = [NSMutableArray new];
+            for (NSUInteger i = 0, max = _decoder.frameCount; i < max; i++) {
+                UIImage *img = [self animatedImageFrameAtIndex:i];
+                if (img) {
+                    [frames addObject:img];
+                } else {
+                    [frames addObject:[NSNull null]];
+                }
+            }
+            dispatch_semaphore_wait(_preloadedLock, DISPATCH_TIME_FOREVER);
+            _preloadedFrames = frames;
+            dispatch_semaphore_signal(_preloadedLock);
+        } else {
+            dispatch_semaphore_wait(_preloadedLock, DISPATCH_TIME_FOREVER);
+            _preloadedFrames = nil;
+            dispatch_semaphore_signal(_preloadedLock);
+        }
+    }
+}
+
+#pragma mark - protocol NSCoding
+
+- (instancetype)initWithCoder:(NSCoder *)aDecoder {
+    NSNumber *scale = [aDecoder decodeObjectForKey:@"YYImageScale"];
+    NSData *data = [aDecoder decodeObjectForKey:@"YYImageData"];
+    if (data.length) {
+        self = [self initWithData:data scale:scale.doubleValue];
+    } else {
+        self = [super initWithCoder:aDecoder];
+    }
+    return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+    if (_decoder.data.length) {
+        [aCoder encodeObject:@(self.scale) forKey:@"YYImageScale"];
+        [aCoder encodeObject:_decoder.data forKey:@"YYImageData"];
+    } else {
+        [super encodeWithCoder:aCoder]; // Apple use UIImagePNGRepresentation() to encode UIImage.
+    }
+}
+
+#pragma mark - protocol YYAnimatedImage
+
+- (NSUInteger)animatedImageFrameCount {
+    return _decoder.frameCount;
+}
+
+- (NSUInteger)animatedImageLoopCount {
+    return _decoder.loopCount;
+}
+
+- (NSUInteger)animatedImageBytesPerFrame {
+    return _bytesPerFrame;
+}
+
+- (UIImage *)animatedImageFrameAtIndex:(NSUInteger)index {
+    if (index >= _decoder.frameCount) return nil;
+    dispatch_semaphore_wait(_preloadedLock, DISPATCH_TIME_FOREVER);
+    UIImage *image = _preloadedFrames[index];
+    dispatch_semaphore_signal(_preloadedLock);
+    if (image) return image == (id)[NSNull null] ? nil : image;
+    return [_decoder frameAtIndex:index decodeForDisplay:YES].image;
+}
+
+- (NSTimeInterval)animatedImageDurationAtIndex:(NSUInteger)index {
+    NSTimeInterval duration = [_decoder frameDurationAtIndex:index];
+    
+    /*
+     http://opensource.apple.com/source/WebCore/WebCore-7600.1.25/platform/graphics/cg/ImageSourceCG.cpp
+     Many annoying ads specify a 0 duration to make an image flash as quickly as
+     possible. We follow Safari and Firefox's behavior and use a duration of 100 ms
+     for any frames that specify a duration of <= 10 ms.
+     See <rdar://problem/7689300> and <http://webkit.org/b/36082> for more information.
+     
+     See also: http://nullsleep.tumblr.com/post/16524517190/animated-gif-minimum-frame-delay-browser.
+     */
+    if (duration < 0.011f) return 0.100f;
+    return duration;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/Protocol/YBIBCellProtocol.h

@@ -0,0 +1,43 @@
+//
+//  YBIBCellProtocol.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/5.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBGetBaseInfoProtocol.h"
+#import "YBIBOrientationReceiveProtocol.h"
+#import "YBIBOperateBrowserProtocol.h"
+
+@protocol YBIBDataProtocol;
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol YBIBCellProtocol <YBIBGetBaseInfoProtocol, YBIBOperateBrowserProtocol, YBIBOrientationReceiveProtocol>
+
+@required
+
+/// Cell 对应的 Data
+@property (nonatomic, strong) id<YBIBDataProtocol> yb_cellData;
+
+@optional
+
+/**
+ 获取前景视图，出入场时需要用这个返回值做动效
+
+ @return 前景视图
+ */
+- (__kindof UIView *)yb_foregroundView;
+
+/**
+ 页码变化了
+ */
+- (void)yb_pageChanged;
+
+/// 当前 Cell 的页码
+@property (nonatomic, copy) NSInteger(^yb_selfPage)(void);
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Protocol/YBIBDataProtocol.h

@@ -0,0 +1,64 @@
+//
+//  YBIBDataProtocol.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/5.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBGetBaseInfoProtocol.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol YBIBDataProtocol <YBIBGetBaseInfoProtocol>
+
+@required
+
+/**
+ 当前 Data 对应 Cell 的类类型
+
+ @return Class 类型
+ */
+- (Class)yb_classOfCell;
+
+@optional
+
+/**
+ 获取投影视图，当前数据模型对应外界业务的 UIView (通常为 UIImageView)，做转场动效用
+ 
+ 这个方法会在做出入场动效时调用，若未实现时将无法进行平滑的入场
+
+ @return 投影视图
+ */
+- (__kindof UIView *)yb_projectiveView;
+
+/**
+ 通过一系列数据，计算并返回图片视图在容器中的 frame
+ 
+ 这个方法会在做入场动效时调用，若未实现时将无法进行平滑的入场
+
+ @param containerSize 容器大小
+ @param imageSize 图片大小 (逻辑像素)
+ @param orientation 图片浏览器的方向
+ @return 计算好的 frame
+ */
+- (CGRect)yb_imageViewFrameWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation;
+
+/**
+ 预加载数据，有效的预加载能提高性能，请注意管理内存
+ */
+- (void)yb_preload;
+
+/**
+ 保存到相册
+ */
+- (void)yb_saveToPhotoAlbum;
+
+/**
+ 是否允许保存到相册
+ */
+- (BOOL)yb_allowSaveToPhotoAlbum;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Protocol/YBIBGetBaseInfoProtocol.h

@@ -0,0 +1,61 @@
+//
+//  YBIBGetBaseInfoProtocol.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/23.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "YBIBAuxiliaryViewHandler.h"
+#import "YBIBWebImageMediator.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol YBIBGetBaseInfoProtocol <NSObject>
+
+@optional
+
+/// 当前的方向
+@property (nonatomic, copy) UIDeviceOrientation(^yb_currentOrientation)(void);
+
+/// 根据方向获取容器大小
+@property (nonatomic, copy) CGSize(^yb_containerSize)(UIDeviceOrientation orientation);
+
+/// 容器视图 (可在上面添加子视图)
+@property (nonatomic, weak) UIView *yb_containerView;
+
+/// 辅助视图处理器
+@property (nonatomic, copy) id<YBIBAuxiliaryViewHandler>(^yb_auxiliaryViewHandler)(void);
+
+/// 图片下载缓存相关中介者
+@property (nonatomic, copy) id<YBIBWebImageMediator>(^yb_webImageMediator)(void);
+
+/// 当前页码
+@property (nonatomic, copy) NSInteger(^yb_currentPage)(void);
+
+/// 总页码数量
+@property (nonatomic, copy) NSInteger(^yb_totalPage)(void);
+
+/// 判断当前展示的 cell 是否恰好在屏幕中间
+@property (nonatomic, copy) BOOL(^yb_cellIsInCenter)(void);
+
+/// 是否正在转场
+@property (nonatomic, copy) BOOL(^yb_isTransitioning)(void);
+/// 是否正在展示过程转场
+@property (nonatomic, copy) BOOL(^yb_isShowTransitioning)(void);
+/// 是否正在隐藏过程转场
+@property (nonatomic, copy) BOOL(^yb_isHideTransitioning)(void);
+
+/// 是否正在旋转
+@property (nonatomic, copy) BOOL(^yb_isRotating)(void);
+
+/// 背景视图 (也就是 YBImageBrower 对象，不可在上面添加子视图。作用：一是可以更改透明度和颜色，入场和出场动效有用；二是可以用来比较内存指针，在做不同实例差异化功能时可能有用，虽然不提倡这么做)
+@property (nonatomic, weak) __kindof UIView *yb_backView;
+
+/// 集合视图
+@property (nonatomic, copy) __kindof UICollectionView *(^yb_collectionView)(void);
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Protocol/YBIBOperateBrowserProtocol.h

@@ -0,0 +1,28 @@
+//
+//  YBIBOperateBrowserProtocol.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/8.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol YBIBOperateBrowserProtocol <NSObject>
+
+@optional
+
+/// 隐藏图片浏览器
+@property (nonatomic, copy) void(^yb_hideBrowser)(void);
+
+/// 是否隐藏状态栏
+@property (nonatomic, copy) void(^yb_hideStatusBar)(BOOL);
+
+/// 是否隐藏工具视图
+@property (nonatomic, copy) void(^yb_hideToolViews)(BOOL);
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Protocol/YBIBOrientationReceiveProtocol.h

@@ -0,0 +1,40 @@
+//
+//  YBIBOrientationReceiveProtocol.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/8.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol YBIBOrientationReceiveProtocol <NSObject>
+
+@optional
+
+/**
+ 图片浏览器的方向将要变化
+
+ @param orientation 期望的方向
+ */
+- (void)yb_orientationWillChangeWithExpectOrientation:(UIDeviceOrientation)orientation;
+
+/**
+ 图片浏览器的方向变化动效调用，实现的变化会自动转换为动画
+
+ @param orientation 期望的方向
+ */
+- (void)yb_orientationChangeAnimationWithExpectOrientation:(UIDeviceOrientation)orientation;
+
+/**
+ 图片浏览器的方向已经变化
+
+ @param orientation 当前的方向
+ */
+- (void)yb_orientationDidChangedWithOrientation:(UIDeviceOrientation)orientation;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Protocol/YBImageBrowserDataSource.h

@@ -0,0 +1,38 @@
+//
+//  YBImageBrowserDataSource.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2018/8/25.
+//  Copyright © 2018年 波儿菜. All rights reserved.
+//
+
+#import "YBIBDataProtocol.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class YBImageBrowser;
+
+@protocol YBImageBrowserDataSource <NSObject>
+
+@required
+
+/**
+ 返回数据源数量
+
+ @param imageBrowser 图片浏览器
+ @return 数量
+ */
+- (NSInteger)yb_numberOfCellsInImageBrowser:(YBImageBrowser *)imageBrowser;
+
+/**
+ 返回当前下标对应的数据
+
+ @param imageBrowser 图片浏览器
+ @param index 当前下标
+ @return 数据
+ */
+- (id<YBIBDataProtocol>)yb_imageBrowser:(YBImageBrowser *)imageBrowser dataForCellAtIndex:(NSInteger)index;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/Protocol/YBImageBrowserDelegate.h

@@ -0,0 +1,54 @@
+//
+//  YBImageBrowserDelegate.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/9.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBDataProtocol.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class YBImageBrowser;
+
+@protocol YBImageBrowserDelegate <NSObject>
+
+@optional
+
+/**
+ 页码变化
+
+ @param imageBrowser 图片浏览器
+ @param page 当前页码
+ @param data 数据
+ */
+- (void)yb_imageBrowser:(YBImageBrowser *)imageBrowser pageChanged:(NSInteger)page data:(id<YBIBDataProtocol>)data;
+
+/**
+ 响应长按手势（若实现该方法将阻止其它地方捕获到长按事件）
+
+ @param imageBrowser 图片浏览器
+ @param data 数据
+ */
+- (void)yb_imageBrowser:(YBImageBrowser *)imageBrowser respondsToLongPressWithData:(id<YBIBDataProtocol>)data;
+
+/**
+ 开始转场
+
+ @param imageBrowser 图片浏览器
+ @param isShow YES 表示入场，NO 表示出场
+ */
+- (void)yb_imageBrowser:(YBImageBrowser *)imageBrowser beginTransitioningWithIsShow:(BOOL)isShow;
+
+/**
+ 结束转场
+
+ @param imageBrowser 图片浏览器
+ @param isShow YES 表示入场，NO 表示出场
+ */
+- (void)yb_imageBrowser:(YBImageBrowser *)imageBrowser endTransitioningWithIsShow:(BOOL)isShow;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/ToolView/YBIBSheetView.h

@@ -0,0 +1,73 @@
+//
+//  YBIBSheetView.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/6.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol YBIBDataProtocol;
+
+typedef void(^YBIBSheetActionBlock)(id<YBIBDataProtocol> data);
+
+@interface YBIBSheetAction : NSObject
+
+/// 显示的名字
+@property (nonatomic, copy) NSString *name;
+
+/// 点击回调闭包
+@property (nonatomic, copy, nullable) YBIBSheetActionBlock action;
+
++ (instancetype)actionWithName:(NSString *)name action:(_Nullable YBIBSheetActionBlock)action;
+
+@end
+
+
+@interface YBIBSheetView : UIView
+
+/// 数据源 (可自定义添加)
+@property (nonatomic, strong) NSMutableArray<YBIBSheetAction *> *actions;
+
+/// 列表 Cell 的高度
+@property (nonatomic, assign) CGFloat cellHeight;
+
+/// 列表最大高度与容器高度的比例
+@property (nonatomic, assign) CGFloat maxHeightScale;
+
+/// 取消的文本
+@property (nonatomic, copy) NSString *cancelText;
+
+/// 显示动画持续时间
+@property (nonatomic, assign) NSTimeInterval showDuration;
+
+/// 隐藏动画持续时间
+@property (nonatomic, assign) NSTimeInterval hideDuration;
+
+/// 背景透明度
+@property (nonatomic, assign) CGFloat backAlpha;
+
+/**
+ 展示
+
+ @param view 指定父视图
+ @param orientation 当前方向
+ */
+- (void)showToView:(UIView *)view orientation:(UIDeviceOrientation)orientation;
+
+/**
+ 隐藏
+
+ @param animation 是否带动画
+ */
+- (void)hideWithAnimation:(BOOL)animation;
+
+/// 获取当前数据的闭包
+@property (nonatomic, copy) id<YBIBDataProtocol>(^currentdata)(void);
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/ToolView/YBIBSheetView.m

@@ -0,0 +1,209 @@
+//
+//  YBIBSheetView.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/6.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBSheetView.h"
+#import "YBIBUtilities.h"
+#import "YBIBCopywriter.h"
+
+
+@implementation YBIBSheetAction
++ (instancetype)actionWithName:(NSString *)name action:(YBIBSheetActionBlock)action {
+    YBIBSheetAction *sheetAction = [YBIBSheetAction new];
+    sheetAction.name = name;
+    sheetAction.action = action;
+    return sheetAction;
+}
+@end
+
+
+@interface YBIBSheetCell : UITableViewCell
+@property (nonatomic, strong) UILabel *titleLabel;
+@property (nonatomic, strong) CALayer *line;
+@end
+@implementation YBIBSheetCell
+- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
+    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
+        self.selectionStyle = UITableViewCellSelectionStyleNone;
+        _titleLabel = [UILabel new];
+        _titleLabel.textColor = UIColor.darkTextColor;
+        _titleLabel.font = [UIFont fontWithName:@"Avenir-Medium" size:16];
+        _titleLabel.textAlignment = NSTextAlignmentCenter;
+        _line = [CALayer new];
+        _line.backgroundColor = UIColor.groupTableViewBackgroundColor.CGColor;
+        [self.contentView addSubview:_titleLabel];
+        [self.contentView.layer addSublayer:_line];
+    }
+    return self;
+}
+- (void)layoutSubviews {
+    [super layoutSubviews];
+    CGFloat width = self.contentView.bounds.size.width, height = self.contentView.bounds.size.height;
+    CGFloat lineHeight = 0.5;
+    _line.frame = CGRectMake(0, height - lineHeight, width, lineHeight);
+    CGFloat offset = 15;
+    _titleLabel.frame = CGRectMake(offset, 0, width - offset * 2, height);
+}
+@end
+
+
+static CGFloat kOffsetSpace = 5;
+
+@interface YBIBSheetView () <UITableViewDelegate, UITableViewDataSource>
+@property (nonatomic, strong) UITableView *tableView;
+@end
+
+@implementation YBIBSheetView {
+    CGRect _tableShowFrame;
+    CGRect _tableHideFrame;
+}
+
+#pragma mark - life cycle
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        _cancelText = [YBIBCopywriter sharedCopywriter].cancel;
+        _maxHeightScale = 0.7;
+        _showDuration = 0.2;
+        _hideDuration = 0.1;
+        _cellHeight = 50;
+        _backAlpha = 0.3;
+        _actions = [NSMutableArray array];
+        
+        [self addSubview:self.tableView];
+    }
+    return self;
+}
+
+#pragma mark - public
+
+- (void)showToView:(UIView *)view orientation:(UIDeviceOrientation)orientation {
+    if (self.actions.count == 0) return;
+    
+    [view addSubview:self];
+    self.frame = view.bounds;
+    
+    UIEdgeInsets padding = YBIBPaddingByBrowserOrientation(orientation);
+    
+    CGFloat footerHeight = padding.bottom;
+    CGFloat tableHeight = self.cellHeight * (self.actions.count + 1) + kOffsetSpace + footerHeight;
+    
+    _tableShowFrame = self.frame;
+    _tableShowFrame.size.height = MIN(self.maxHeightScale * self.bounds.size.height, tableHeight);
+    _tableShowFrame.origin.y = self.bounds.size.height - _tableShowFrame.size.height;
+    
+    _tableHideFrame = _tableShowFrame;
+    _tableHideFrame.origin.y = self.bounds.size.height;
+    
+    self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0];
+    self.tableView.frame = _tableHideFrame;
+    self.tableView.tableFooterView.bounds = CGRectMake(0, 0, self.tableView.frame.size.width, footerHeight);
+    [UIView animateWithDuration:self.showDuration animations:^{
+        self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:self->_backAlpha];
+        self.tableView.frame = self->_tableShowFrame;
+    }];
+}
+
+- (void)hideWithAnimation:(BOOL)animation {
+    if (!self.superview) return;
+    
+    void(^animationsBlock)(void) = ^{
+        self.tableView.frame = self->_tableHideFrame;
+        self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0];
+    };
+    void(^completionBlock)(BOOL n) = ^(BOOL n){
+        [self removeFromSuperview];
+    };
+    if (animation) {
+        [UIView animateWithDuration:self.hideDuration animations:animationsBlock completion:completionBlock];
+    } else {
+        animationsBlock();
+        completionBlock(NO);
+    }
+}
+
+#pragma mark - touch
+
+- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
+    CGPoint point = [touches.anyObject locationInView:self];
+    if (!CGRectContainsPoint(self.tableView.frame, point)) {
+        [self hideWithAnimation:YES];
+    }
+}
+
+#pragma mark - <UITableViewDataSource>
+
+- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
+    return 2;
+}
+
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
+    return section == 0 ? self.actions.count : 1;
+}
+
+- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
+    return self.cellHeight;
+}
+
+- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
+    return section == 0 ? CGFLOAT_MIN : kOffsetSpace;
+}
+
+- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {
+    return CGFLOAT_MIN;
+}
+
+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
+    YBIBSheetCell *cell = [tableView dequeueReusableCellWithIdentifier:NSStringFromClass(YBIBSheetCell.self)];
+    if (indexPath.section == 0) {
+        cell.line.hidden = NO;
+        YBIBSheetAction *action = self.actions[indexPath.row];
+        cell.titleLabel.text = action.name;
+    } else {
+        cell.line.hidden = YES;
+        cell.titleLabel.text = self.cancelText;
+    }
+    return cell;
+}
+
+#pragma mark - <UITableViewDelegate>
+
+- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
+    if (indexPath.section == 0) {
+        YBIBSheetAction *action = self.actions[indexPath.row];
+        if (action.action) action.action(self.currentdata());
+    } else {
+        [self hideWithAnimation:YES];
+    }
+}
+
+#pragma mark - getters
+
+- (UITableView *)tableView {
+    if (!_tableView) {
+        _tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStyleGrouped];
+        _tableView.delegate = self;
+        _tableView.dataSource = self;
+        _tableView.estimatedRowHeight = 44;
+        _tableView.estimatedSectionFooterHeight = 0;
+        _tableView.estimatedSectionHeaderHeight = 0;
+        _tableView.backgroundColor = [UIColor clearColor];
+        _tableView.alwaysBounceVertical = NO;
+        _tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
+        if (@available(iOS 11.0, *)) {
+            _tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
+        }
+        UIView *footer = [UIView new];
+        footer.backgroundColor = UIColor.whiteColor;
+        _tableView.tableFooterView = footer;
+        [_tableView registerClass:YBIBSheetCell.self forCellReuseIdentifier:NSStringFromClass(YBIBSheetCell.self)];
+    }
+    return _tableView;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/ToolView/YBIBToolViewHandler.h

@@ -0,0 +1,67 @@
+//
+//  YBIBToolViewHandler.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/7.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBSheetView.h"
+#import "YBIBTopView.h"
+#import "YBIBDataProtocol.h"
+#import "YBIBOrientationReceiveProtocol.h"
+#import "YBIBOperateBrowserProtocol.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol YBIBToolViewHandler <YBIBGetBaseInfoProtocol, YBIBOperateBrowserProtocol, YBIBOrientationReceiveProtocol>
+
+@required
+
+/**
+ 容器视图准备好了，可进行子视图的添加和布局
+ */
+- (void)yb_containerViewIsReadied;
+
+/**
+ 隐藏视图
+ 
+ @param hide 是否隐藏
+ */
+- (void)yb_hide:(BOOL)hide;
+
+@optional
+
+/// 当前数据
+@property (nonatomic, copy) id<YBIBDataProtocol>(^yb_currentData)(void);
+
+/**
+ 页码变化了
+ */
+- (void)yb_pageChanged;
+
+/**
+ 偏移量变化了
+
+ @param offsetX 当前偏移量
+ */
+- (void)yb_offsetXChanged:(CGFloat)offsetX;
+
+/**
+ 响应长按手势
+ */
+- (void)yb_respondsToLongPress;
+
+@end
+
+@interface YBIBToolViewHandler : NSObject <YBIBToolViewHandler>
+
+/// 弹出表单视图
+@property (nonatomic, strong, readonly) YBIBSheetView *sheetView;
+
+/// 顶部显示页码视图
+@property (nonatomic, strong, readonly) YBIBTopView *topView;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/ToolView/YBIBToolViewHandler.m

@@ -0,0 +1,144 @@
+//
+//  YBIBToolViewHandler.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/7.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBToolViewHandler.h"
+#import "YBIBCopywriter.h"
+#import "YBIBUtilities.h"
+
+@interface YBIBToolViewHandler ()
+@property (nonatomic, strong) YBIBSheetView *sheetView;
+@property (nonatomic, strong) YBIBSheetAction *saveAction;
+@property (nonatomic, strong) YBIBTopView *topView;
+@end
+
+@implementation YBIBToolViewHandler
+
+#pragma mark - <YBIBToolViewHandler>
+
+@synthesize yb_containerView = _yb_containerView;
+@synthesize yb_containerSize = _yb_containerSize;
+@synthesize yb_currentPage = _yb_currentPage;
+@synthesize yb_totalPage = _yb_totalPage;
+@synthesize yb_currentOrientation = _yb_currentOrientation;
+@synthesize yb_currentData = _yb_currentData;
+
+- (void)yb_containerViewIsReadied {
+    [self.yb_containerView addSubview:self.topView];
+    [self layoutWithExpectOrientation:self.yb_currentOrientation()];
+}
+
+- (void)yb_pageChanged {
+    if (self.topView.operationType == YBIBTopViewOperationTypeSave) {
+        self.topView.operationButton.hidden = [self currentDataShouldHideSaveButton];
+    }
+    [self.topView setPage:self.yb_currentPage() totalPage:self.yb_totalPage()];
+}
+
+- (void)yb_respondsToLongPress {
+    [self showSheetView];
+}
+
+- (void)yb_hide:(BOOL)hide {
+    self.topView.hidden = hide;
+    [self.sheetView hideWithAnimation:NO];
+}
+
+- (void)yb_orientationWillChangeWithExpectOrientation:(UIDeviceOrientation)orientation {
+    [self.sheetView hideWithAnimation:NO];
+}
+
+- (void)yb_orientationChangeAnimationWithExpectOrientation:(UIDeviceOrientation)orientation {
+    [self layoutWithExpectOrientation:orientation];
+}
+
+#pragma mark - private
+
+- (BOOL)currentDataShouldHideSaveButton {
+    id<YBIBDataProtocol> data = self.yb_currentData();
+    BOOL allow = [data respondsToSelector:@selector(yb_allowSaveToPhotoAlbum)] && [data yb_allowSaveToPhotoAlbum];
+    BOOL can = [data respondsToSelector:@selector(yb_saveToPhotoAlbum)];
+    return !(allow && can);
+}
+
+- (void)layoutWithExpectOrientation:(UIDeviceOrientation)orientation {
+    CGSize containerSize = self.yb_containerSize(orientation);
+    UIEdgeInsets padding = YBIBPaddingByBrowserOrientation(orientation);
+    
+    self.topView.frame = CGRectMake(padding.left, padding.top, containerSize.width - padding.left - padding.right, [YBIBTopView defaultHeight]);
+}
+
+- (void)showSheetView {
+    if ([self currentDataShouldHideSaveButton]) {
+        [self.sheetView.actions removeObject:self.saveAction];
+    } else {
+        if (![self.sheetView.actions containsObject:self.saveAction]) {
+            [self.sheetView.actions addObject:self.saveAction];
+        }
+    }
+    [self.sheetView showToView:self.yb_containerView orientation:self.yb_currentOrientation()];
+}
+
+#pragma mark - getters
+
+- (YBIBSheetView *)sheetView {
+    if (!_sheetView) {
+        _sheetView = [YBIBSheetView new];
+        __weak typeof(self) wSelf = self;
+        [_sheetView setCurrentdata:^id<YBIBDataProtocol>{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return nil;
+            return self.yb_currentData();
+        }];
+    }
+    return _sheetView;
+}
+
+- (YBIBSheetAction *)saveAction {
+    if (!_saveAction) {
+        __weak typeof(self) wSelf = self;
+        _saveAction = [YBIBSheetAction actionWithName:[YBIBCopywriter sharedCopywriter].saveToPhotoAlbum action:^(id<YBIBDataProtocol> data) {
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            if ([data respondsToSelector:@selector(yb_saveToPhotoAlbum)]) {
+                [data yb_saveToPhotoAlbum];
+            }
+            [self.sheetView hideWithAnimation:YES];
+        }];
+    }
+    return _saveAction;
+}
+
+- (YBIBTopView *)topView {
+    if (!_topView) {
+        _topView = [YBIBTopView new];
+        _topView.operationType = YBIBTopViewOperationTypeMore;
+        __weak typeof(self) wSelf = self;
+        [_topView setClickOperation:^(YBIBTopViewOperationType type) {
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            switch (type) {
+                case YBIBTopViewOperationTypeSave: {
+                    id<YBIBDataProtocol> data = self.yb_currentData();
+                    if ([data respondsToSelector:@selector(yb_saveToPhotoAlbum)]) {
+                        [data yb_saveToPhotoAlbum];
+                    }
+                }
+                    break;
+                case YBIBTopViewOperationTypeMore: {
+                    [self showSheetView];
+                }
+                    break;
+                default:
+                    break;
+            }
+        }];
+    }
+    return _topView;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/ToolView/YBIBTopView.h

@@ -0,0 +1,44 @@
+//
+//  YBIBTopView.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/6.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef NS_ENUM(NSInteger, YBIBTopViewOperationType) {
+    YBIBTopViewOperationTypeSave,   //保存
+    YBIBTopViewOperationTypeMore    //更多
+};
+
+@interface YBIBTopView : UIView
+
+/// 页码标签
+@property (nonatomic, strong, readonly) UILabel *pageLabel;
+
+/// 操作按钮（自定义：直接修改图片或文字，然后添加点击事件）
+@property (nonatomic, strong, readonly) UIButton *operationButton;
+
+/// 按钮类型
+@property (nonatomic, assign) YBIBTopViewOperationType operationType;
+
+/**
+ 设置页码
+
+ @param page 当前页码
+ @param totalPage 总页码数
+ */
+- (void)setPage:(NSInteger)page totalPage:(NSInteger)totalPage;
+
+/// 点击操作按钮的回调
+@property (nonatomic, copy) void(^clickOperation)(YBIBTopViewOperationType type);
+
++ (CGFloat)defaultHeight;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/ToolView/YBIBTopView.m

@@ -0,0 +1,113 @@
+//
+//  YBIBTopView.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/7/6.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBTopView.h"
+#import "YBIBIconManager.h"
+#import "YBIBUtilities.h"
+
+@interface YBIBTopView ()
+@property (nonatomic, strong) UILabel *pageLabel;
+@property (nonatomic, strong) UIButton *operationButton;
+@end
+
+@implementation YBIBTopView
+
+#pragma mark - life cycle
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        [self addSubview:self.pageLabel];
+        [self addSubview:self.operationButton];
+        
+        [self setOperationType:YBIBTopViewOperationTypeMore];
+    }
+    return self;
+}
+
+- (void)layoutSubviews {
+    [super layoutSubviews];
+    CGFloat height = self.bounds.size.height, width = self.bounds.size.width;
+    self.pageLabel.frame = CGRectMake(16, 0, width / 3, height);
+    CGFloat buttonWidth = 54;
+    self.operationButton.frame = CGRectMake(width - buttonWidth, 0, buttonWidth, height);
+}
+
+#pragma mark - public
+
++ (CGFloat)defaultHeight {
+    return 50;
+}
+
+- (void)setPage:(NSInteger)page totalPage:(NSInteger)totalPage {
+    if (totalPage <= 1) {
+        self.pageLabel.hidden = YES;
+    } else {
+        self.pageLabel.hidden  = NO;
+        
+        NSString *text = [NSString stringWithFormat:@"%ld/%ld", page + (NSInteger)1, totalPage];
+        NSShadow *shadow = [NSShadow new];
+        shadow.shadowBlurRadius = 4;
+        shadow.shadowOffset = CGSizeMake(0, 1);
+        shadow.shadowColor = UIColor.darkGrayColor;
+        NSMutableAttributedString *attr = [[NSMutableAttributedString alloc] initWithString:text attributes:@{NSShadowAttributeName:shadow}];
+        self.pageLabel.attributedText = attr;
+    }
+}
+
+#pragma mark - event
+
+- (void)clickOperationButton:(UIButton *)button {
+    if (self.clickOperation) self.clickOperation(self.operationType);
+}
+
+#pragma mark - getters & setters
+
+- (void)setOperationType:(YBIBTopViewOperationType)operationType {
+    _operationType = operationType;
+    
+    UIImage *image = nil;
+    switch (operationType) {
+        case YBIBTopViewOperationTypeSave:
+            image = [YBIBIconManager sharedManager].toolSaveImage();
+            break;
+        case YBIBTopViewOperationTypeMore:
+            image = [YBIBIconManager sharedManager].toolMoreImage();
+            break;
+    }
+    
+    [self.operationButton setImage:image forState:UIControlStateNormal];
+}
+
+- (UILabel *)pageLabel {
+    if (!_pageLabel) {
+        _pageLabel = [UILabel new];
+        _pageLabel.textColor = [UIColor whiteColor];
+        _pageLabel.font = [UIFont boldSystemFontOfSize:16];
+        _pageLabel.textAlignment = NSTextAlignmentLeft;
+        _pageLabel.adjustsFontSizeToFitWidth = YES;
+    }
+    return _pageLabel;
+}
+
+- (UIButton *)operationButton {
+    if (!_operationButton) {
+        _operationButton = [UIButton buttonWithType:UIButtonTypeCustom];
+        _operationButton.titleLabel.font = [UIFont boldSystemFontOfSize:16];
+        _operationButton.titleLabel.adjustsFontSizeToFitWidth = YES;
+        [_operationButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
+        [_operationButton addTarget:self action:@selector(clickOperationButton:) forControlEvents:UIControlEventTouchUpInside];
+        _operationButton.layer.shadowColor = UIColor.darkGrayColor.CGColor;
+        _operationButton.layer.shadowOffset = CGSizeMake(0, 1);
+        _operationButton.layer.shadowOpacity = 1;
+        _operationButton.layer.shadowRadius = 4;
+    }
+    return _operationButton;
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/WebImageMediator/YBIBDefaultWebImageMediator.h

@@ -0,0 +1,17 @@
+//
+//  YBIBDefaultWebImageMediator.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/8/27.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBWebImageMediator.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBIBDefaultWebImageMediator : NSObject <YBIBWebImageMediator>
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/WebImageMediator/YBIBDefaultWebImageMediator.m

@@ -0,0 +1,74 @@
+//
+//  YBIBDefaultWebImageMediator.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/8/27.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import "YBIBDefaultWebImageMediator.h"
+#import "YBIBUtilities.h"
+#if __has_include(<SDWebImage/SDWebImage.h>)
+#import <SDWebImage/SDWebImage.h>
+#else
+#import "SDWebImage.h"
+#endif
+
+@implementation YBIBDefaultWebImageMediator
+
+#pragma mark - <YBIBWebImageMediator>
+
+- (id)yb_downloadImageWithURL:(NSURL *)URL requestModifier:(nullable YBIBWebImageRequestModifierBlock)requestModifier progress:(nonnull YBIBWebImageProgressBlock)progress success:(nonnull YBIBWebImageSuccessBlock)success failed:(nonnull YBIBWebImageFailedBlock)failed {
+    if (!URL) return nil;
+    
+    SDWebImageContext *context = nil;
+    if (requestModifier) {
+        SDWebImageDownloaderRequestModifier *modifier = [SDWebImageDownloaderRequestModifier requestModifierWithBlock:requestModifier];
+        context = @{SDWebImageContextDownloadRequestModifier:modifier};
+    }
+    
+    SDWebImageDownloaderOptions options = SDWebImageDownloaderLowPriority | SDWebImageDownloaderAvoidDecodeImage;
+    
+    SDWebImageDownloadToken *token = [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:URL options:options context:context progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
+        if (progress) progress(receivedSize, expectedSize);
+    } completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
+        if (error) {
+            if (failed) failed(error, finished);
+        } else {
+            if (success) success(data, finished);
+        }
+    }];
+    return token;
+}
+
+- (void)yb_cancelTaskWithDownloadToken:(id)token {
+    if (token && [token isKindOfClass:SDWebImageDownloadToken.class]) {
+        [((SDWebImageDownloadToken *)token) cancel];
+    }
+}
+
+- (void)yb_storeToDiskWithImageData:(NSData *)data forKey:(NSURL *)key {
+    if (!key) return;
+    NSString *cacheKey = [SDWebImageManager.sharedManager cacheKeyForURL:key];
+    if (!cacheKey) return;
+    
+    YBIB_DISPATCH_ASYNC(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
+        [[SDImageCache sharedImageCache] storeImageDataToDisk:data forKey:cacheKey];
+    })
+}
+
+- (void)yb_queryCacheOperationForKey:(NSURL *)key completed:(YBIBWebImageCacheQueryCompletedBlock)completed {
+#define QUERY_CACHE_FAILED if (completed) {completed(nil, nil); return;}
+    if (!key) QUERY_CACHE_FAILED
+        NSString *cacheKey = [SDWebImageManager.sharedManager cacheKeyForURL:key];
+    if (!cacheKey) QUERY_CACHE_FAILED
+#undef QUERY_CACHE_FAILED
+        
+        // 'NSData' of image must be read to ensure decoding correctly.
+        SDImageCacheOptions options = SDImageCacheQueryMemoryData | SDImageCacheAvoidDecodeImage;
+    [[SDImageCache sharedImageCache] queryCacheOperationForKey:cacheKey options:options done:^(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType) {
+        if (completed) completed(image, data);
+    }];
+}
+
+@end

Pods/YBImageBrowser/YBImageBrowser/WebImageMediator/YBIBWebImageMediator.h

@@ -0,0 +1,62 @@
+//
+//  YBIBWebImageMediator.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/8/27.
+//  Copyright © 2019 杨波. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef NSURLRequest * _Nullable (^YBIBWebImageRequestModifierBlock)(NSURLRequest *request);
+typedef void(^YBIBWebImageProgressBlock)(NSInteger receivedSize, NSInteger expectedSize);
+typedef void(^YBIBWebImageSuccessBlock)(NSData * _Nullable imageData, BOOL finished);
+typedef void(^YBIBWebImageFailedBlock)(NSError * _Nullable error, BOOL finished);
+typedef void(^YBIBWebImageCacheQueryCompletedBlock)(UIImage * _Nullable image, NSData * _Nullable imageData);
+
+@protocol YBIBWebImageMediator <NSObject>
+
+@required
+
+/**
+ 下载图片
+
+ @param URL 图片地址
+ @param requestModifier 修改默认 NSURLRequest 的闭包
+ @param progress 进度回调
+ @param success 成功回调
+ @param failed 失败回调
+ @return 下载 token (可为空)
+ */
+- (id)yb_downloadImageWithURL:(NSURL *)URL requestModifier:(nullable YBIBWebImageRequestModifierBlock)requestModifier progress:(YBIBWebImageProgressBlock)progress success:(YBIBWebImageSuccessBlock)success failed:(YBIBWebImageFailedBlock)failed;
+
+/**
+ 缓存图片数据到磁盘
+
+ @param data 图片数据
+ @param key 缓存标识
+ */
+- (void)yb_storeToDiskWithImageData:(nullable NSData *)data forKey:(NSURL *)key;
+
+/**
+ 读取图片数据
+
+ @param key 缓存标识
+ @param completed 读取回调
+ */
+- (void)yb_queryCacheOperationForKey:(NSURL *)key completed:(YBIBWebImageCacheQueryCompletedBlock)completed;
+
+@optional
+
+/**
+ 取消下载
+ 
+ @param token 下载 token
+ */
+- (void)yb_cancelTaskWithDownloadToken:(id)token;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/YBImageBrowser.h

@@ -0,0 +1,111 @@
+//
+//  YBImageBrowser.h
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/5.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBIBCollectionView.h"
+#import "YBImageBrowserDataSource.h"
+#import "YBImageBrowserDelegate.h"
+#import "YBIBDataProtocol.h"
+#import "YBIBCellProtocol.h"
+#import "YBIBAnimatedTransition.h"
+#import "YBIBAuxiliaryViewHandler.h"
+#import "YBIBToolViewHandler.h"
+#import "YBIBWebImageMediator.h"
+#import "YBIBImageData.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface YBImageBrowser : UIView
+
+/// 数据源数组
+@property (nonatomic, copy) NSArray<id<YBIBDataProtocol>> *dataSourceArray;
+
+/// 数据源代理
+@property (nonatomic, weak) id<YBImageBrowserDataSource> dataSource;
+
+/// 状态回调代理
+@property (nonatomic, weak) id<YBImageBrowserDelegate> delegate;
+
+/**
+ 展示图片浏览器
+
+ @param view 指定父视图（view 的大小不能为 CGSizeZero，但允许变化）
+ @param containerSize 容器大小（当 view 的大小允许变化时，必须指定确切的 containerSize）
+ */
+- (void)showToView:(UIView *)view containerSize:(CGSize)containerSize;
+- (void)showToView:(UIView *)view;
+- (void)show;
+
+/**
+ 隐藏图片浏览器（不建议外部持有图片浏览器重复使用）
+ */
+- (void)hide;
+
+/// 当前页码
+@property (nonatomic, assign) NSInteger currentPage;
+
+/// 分页间距
+@property (nonatomic, assign) CGFloat distanceBetweenPages;
+
+/// 当前图片浏览器的方向
+@property (nonatomic, assign, readonly) UIDeviceOrientation currentOrientation;
+
+/// 图片浏览器支持的方向 (仅当前控制器不支持旋转时有效，否则将跟随控制器旋转)
+@property (nonatomic, assign) UIInterfaceOrientationMask supportedOrientations;
+
+/// 是否自动隐藏 id<YBIBImageData> 设置的映射视图，默认为 YES
+@property (nonatomic, assign) BOOL autoHideProjectiveView;
+
+/// 是否正在转场
+@property (nonatomic, assign, readonly, getter=isTransitioning) BOOL transitioning;
+/// 是否正在进行展示过程转场
+@property (nonatomic, assign, readonly, getter=isShowTransitioning) BOOL showTransitioning;
+/// 是否正在进行隐藏过程转场
+@property (nonatomic, assign, readonly, getter=isHideTransitioning) BOOL hideTransitioning;
+
+/// 预加载数量 (默认为 2，低内存设备默认为 0)
+@property (nonatomic, assign) NSUInteger preloadCount;
+
+/**
+ 重载数据，请保证数据源被正确修改
+ */
+- (void)reloadData;
+
+/**
+ 获取当前展示的数据对象
+
+ @return 数据对象
+ */
+- (id<YBIBDataProtocol>)currentData;
+
+/// 是否隐藏状态栏，默认为 YES（该值为 YES 时需要在 info.plist 中添加 View controller-based status bar appearance : NO 才能生效）
+@property (nonatomic, assign) BOOL shouldHideStatusBar;
+
+/// 工具视图处理器
+/// 赋值可自定义，实现者可以直接用 UIView，或者创建一个中介者管理一系列的 UIView。
+/// 内部消息是按照数组下标顺序调度的，所以如果有多个处理器注意添加 UIView 的视图层级。
+@property (nonatomic, copy) NSArray<id<YBIBToolViewHandler>> *toolViewHandlers;
+/// 默认工具视图处理器
+@property (nonatomic, weak, readonly) YBIBToolViewHandler *defaultToolViewHandler;
+
+/// Toast/Loading 处理器 (赋值可自定义)
+@property (nonatomic, strong) id<YBIBAuxiliaryViewHandler> auxiliaryViewHandler;
+
+/// 转场实现类 (赋值可自定义)
+@property (nonatomic, strong) id<YBIBAnimatedTransition> animatedTransition;
+/// 默认转场实现类 (可配置其属性)
+@property (nonatomic, weak, readonly) YBIBAnimatedTransition *defaultAnimatedTransition;
+
+/// 图片下载缓存相关的中介者（赋值可自定义）
+@property (nonatomic, strong) id<YBIBWebImageMediator> webImageMediator;
+
+/// 核心集合视图
+@property (nonatomic, strong, readonly) YBIBCollectionView *collectionView;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/YBImageBrowser/YBImageBrowser/YBImageBrowser.m

@@ -0,0 +1,538 @@
+//
+//  YBImageBrowser.m
+//  YBImageBrowserDemo
+//
+//  Created by 波儿菜 on 2019/6/5.
+//  Copyright © 2019 波儿菜. All rights reserved.
+//
+
+#import "YBImageBrowser.h"
+#import "YBIBUtilities.h"
+#import "YBIBCellProtocol.h"
+#import "YBIBDataMediator.h"
+#import "YBIBScreenRotationHandler.h"
+#import "NSObject+YBImageBrowser.h"
+#import "YBImageBrowser+Internal.h"
+#if __has_include("YBIBDefaultWebImageMediator.h")
+#import "YBIBDefaultWebImageMediator.h"
+#endif
+
+@interface YBImageBrowser () <UICollectionViewDelegate, UICollectionViewDataSource>
+@property (nonatomic, strong) YBIBCollectionView *collectionView;
+@property (nonatomic, strong) YBIBDataMediator *dataMediator;
+@property (nonatomic, strong) YBIBScreenRotationHandler *rotationHandler;
+@end
+
+@implementation YBImageBrowser {
+    BOOL _originStatusBarHidden;
+}
+
+#pragma mark - life cycle
+
+- (void)dealloc {
+    self.hiddenProjectiveView = nil;
+    [self showStatusBar];
+}
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    self = [super initWithFrame:frame];
+    if (self) {
+        self.backgroundColor = UIColor.blackColor;
+        UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(respondsToLongPress:)];
+        [self addGestureRecognizer:longPress];
+        [self initValue];
+    }
+    return self;
+}
+
+- (void)initValue {
+    _transitioning = _showTransitioning = _hideTransitioning = NO;
+    _defaultAnimatedTransition = _animatedTransition = [YBIBAnimatedTransition new];
+    _toolViewHandlers = @[[YBIBToolViewHandler new]];
+    _defaultToolViewHandler = _toolViewHandlers[0];
+    _auxiliaryViewHandler = [YBIBAuxiliaryViewHandler new];
+    _shouldHideStatusBar = YES;
+    _autoHideProjectiveView = YES;
+#if __has_include("YBIBDefaultWebImageMediator.h")
+    _webImageMediator = [YBIBDefaultWebImageMediator new];
+#endif
+}
+
+#pragma mark - private
+
+- (void)build {
+    [self addSubview:self.collectionView];
+    self.collectionView.frame = self.bounds;
+    self.collectionView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+    
+    [self addSubview:self.containerView];
+    self.containerView.frame = self.bounds;
+    self.containerView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+    
+    [self buildToolView];
+    
+    [self layoutIfNeeded];
+    
+    [self collectionViewScrollToPage:self.currentPage];
+    [self.rotationHandler startObserveDeviceOrientation];
+}
+
+- (void)buildToolView {
+    for (id<YBIBToolViewHandler> handler in self.toolViewHandlers) {
+        [self implementGetBaseInfoProtocol:handler];
+        [self implementOperateBrowserProtocol:handler];
+        __weak typeof(self) wSelf = self;
+        if ([handler respondsToSelector:@selector(setYb_currentData:)]) {
+            [handler setYb_currentData:^id<YBIBDataProtocol>{
+                __strong typeof(wSelf) self = wSelf;
+                if (!self) return nil;
+                return self.currentData;
+            }];
+        }
+        [handler yb_containerViewIsReadied];
+        [handler yb_hide:NO];
+    }
+}
+
+- (void)rebuild {
+    self.hiddenProjectiveView = nil;
+    [self showStatusBar];
+    [self.containerView removeFromSuperview];
+    _containerView = nil;
+    [self.collectionView removeFromSuperview];
+    _collectionView = nil;
+    [self.dataMediator clear];
+    [self.rotationHandler clear];
+}
+
+- (void)collectionViewScrollToPage:(NSInteger)page {
+    [self.collectionView scrollToPage:page];
+    [self pageNumberChanged];
+}
+
+- (void)pageNumberChanged {
+    id<YBIBDataProtocol> data = self.currentData;
+    UIView *projectiveView = nil;
+    if ([data respondsToSelector:@selector(yb_projectiveView)]) {
+        projectiveView = [data yb_projectiveView];
+    }
+    self.hiddenProjectiveView = projectiveView;
+    
+    if (self.delegate && [self.delegate respondsToSelector:@selector(yb_imageBrowser:pageChanged:data:)]) {
+        [self.delegate yb_imageBrowser:self pageChanged:self.currentPage data:data];
+    }
+    for (id<YBIBToolViewHandler> handler in self.toolViewHandlers) {
+        if ([handler respondsToSelector:@selector(yb_pageChanged)]) {
+            [handler yb_pageChanged];
+        }
+    }
+    NSArray *visibleCells = self.collectionView.visibleCells;
+    for (UICollectionViewCell<YBIBCellProtocol> *cell in visibleCells) {
+        if ([cell respondsToSelector:@selector(yb_pageChanged)]) {
+            [cell yb_pageChanged];
+        }
+    }
+}
+
+- (void)showStatusBar {
+    if (self.shouldHideStatusBar) {
+        [UIApplication sharedApplication].statusBarHidden = _originStatusBarHidden;
+    }
+}
+
+- (void)hideStatusBar {
+    if (self.shouldHideStatusBar) {
+        [UIApplication sharedApplication].statusBarHidden = YES;
+    }
+}
+
+#pragma mark - public
+
+- (void)show {
+    [self showToView:[UIApplication sharedApplication].keyWindow];
+}
+
+- (void)showToView:(UIView *)view {
+    [self showToView:view containerSize:view.bounds.size];
+}
+
+- (void)showToView:(UIView *)view containerSize:(CGSize)containerSize {
+    [self.rotationHandler startObserveStatusBarOrientation];
+    
+    [view addSubview:self];
+    self.frame = view.bounds;
+    self.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+    
+    _originStatusBarHidden = [UIApplication sharedApplication].isStatusBarHidden;
+    
+    [self.rotationHandler configContainerSize:containerSize];
+    
+    [self.dataMediator preloadWithPage:self.currentPage];
+    
+    __kindof UIView *startView;
+    UIImage *startImage;
+    CGRect endFrame = CGRectZero;
+    id<YBIBDataProtocol> data = [self.dataMediator dataForCellAtIndex:self.currentPage];
+    if ([data respondsToSelector:@selector(yb_projectiveView)]) {
+        startView = data.yb_projectiveView;
+        self.hiddenProjectiveView = startView;
+        if ([startView isKindOfClass:UIImageView.class]) {
+            startImage = ((UIImageView *)startView).image;
+        } else {
+            startImage = YBIBSnapshotView(startView);
+        }
+    }
+    if ([data respondsToSelector:@selector(yb_imageViewFrameWithContainerSize:imageSize:orientation:)]) {
+        endFrame = [data yb_imageViewFrameWithContainerSize:self.bounds.size imageSize:startImage.size orientation:self.rotationHandler.currentOrientation];
+    }
+    
+    [self setTransitioning:YES isShow:YES];
+    [self.animatedTransition yb_showTransitioningWithContainer:self startView:startView startImage:startImage endFrame:endFrame orientation:self.rotationHandler.currentOrientation completion:^{
+        [self hideStatusBar];
+        [self build];
+        [self setTransitioning:NO isShow:YES];
+    }];
+}
+
+- (void)hide {
+    __kindof UIView *startView;
+    __kindof UIView *endView;
+    UICollectionViewCell<YBIBCellProtocol> *cell = (UICollectionViewCell<YBIBCellProtocol> *)self.collectionView.centerCell;
+    if ([cell respondsToSelector:@selector(yb_foregroundView)]) {
+        startView = cell.yb_foregroundView;
+    }
+    if ([cell.yb_cellData respondsToSelector:@selector(yb_projectiveView)]) {
+        endView = cell.yb_cellData.yb_projectiveView;
+    }
+    
+    for (id<YBIBToolViewHandler> handler in self.toolViewHandlers) {
+        [handler yb_hide:YES];
+    }
+    [self showStatusBar];
+    
+    [self setTransitioning:YES isShow:NO];
+    [self.animatedTransition yb_hideTransitioningWithContainer:self startView:startView endView:endView orientation:self.rotationHandler.currentOrientation completion:^{
+        [self rebuild];
+        [self removeFromSuperview];
+        [self setTransitioning:NO isShow:NO];
+    }];
+}
+
+- (void)reloadData {
+    [self.dataMediator clear];
+    NSInteger page = self.currentPage;
+    [self.collectionView reloadData];
+    self.currentPage = page;
+}
+
+- (id<YBIBDataProtocol>)currentData {
+    return [self.dataMediator dataForCellAtIndex:self.currentPage];
+}
+
+#pragma mark - internal
+
+- (void)setHiddenProjectiveView:(NSObject *)hiddenProjectiveView {
+    if (_hiddenProjectiveView && [_hiddenProjectiveView respondsToSelector:@selector(setAlpha:)]) {
+        CGFloat originAlpha = _hiddenProjectiveView.ybib_originAlpha;
+        if (originAlpha != 1) {
+            [_hiddenProjectiveView setValue:@(1) forKey:@"alpha"];
+            [UIView animateWithDuration:0.2 animations:^{
+                [self->_hiddenProjectiveView setValue:@(originAlpha) forKey:@"alpha"];
+            }];
+        } else {
+            [_hiddenProjectiveView setValue:@(originAlpha) forKey:@"alpha"];
+        }
+    }
+    _hiddenProjectiveView = hiddenProjectiveView;
+    
+    if (!self.autoHideProjectiveView) return;
+    
+    if (hiddenProjectiveView && [hiddenProjectiveView respondsToSelector:@selector(setAlpha:)]) {
+        hiddenProjectiveView.ybib_originAlpha = ((NSNumber *)[hiddenProjectiveView valueForKey:@"alpha"]).floatValue;
+        [hiddenProjectiveView setValue:@(0) forKey:@"alpha"];
+    }
+}
+
+- (void)implementOperateBrowserProtocol:(id<YBIBOperateBrowserProtocol>)obj {
+    __weak typeof(self) wSelf = self;
+    if ([obj respondsToSelector:@selector(setYb_hideBrowser:)]) {
+        [obj setYb_hideBrowser:^{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            [self hide];
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_hideStatusBar:)]) {
+        [obj setYb_hideStatusBar:^(BOOL hide) {
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            hide ? [self hideStatusBar] : [self showStatusBar];
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_hideToolViews:)]) {
+        [obj setYb_hideToolViews:^(BOOL hide) {
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return;
+            for (id<YBIBToolViewHandler> handler in self.toolViewHandlers) {
+                [handler yb_hide:hide];
+            }
+        }];
+    }
+}
+
+- (void)implementGetBaseInfoProtocol:(id<YBIBGetBaseInfoProtocol>)obj {
+    __weak typeof(self) wSelf = self;
+    if ([obj respondsToSelector:@selector(setYb_currentOrientation:)]) {
+        [obj setYb_currentOrientation:^UIDeviceOrientation{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return UIDeviceOrientationPortrait;
+            return self.rotationHandler.currentOrientation;
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_containerSize:)]) {
+        [obj setYb_containerSize:^CGSize(UIDeviceOrientation orientation) {
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return CGSizeZero;
+            return [self.rotationHandler containerSizeWithOrientation:orientation];
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_auxiliaryViewHandler:)]) {
+        [obj setYb_auxiliaryViewHandler:^id<YBIBAuxiliaryViewHandler>{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return nil;
+            return self.auxiliaryViewHandler;
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_webImageMediator:)]) {
+        [obj setYb_webImageMediator:^id<YBIBWebImageMediator> {
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return nil;
+            NSAssert(self.webImageMediator, @"'webImageMediator' should not be nil.");
+            return self.webImageMediator;
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_currentPage:)]) {
+        [obj setYb_currentPage:^NSInteger{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return 0;
+            return self.currentPage;
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_totalPage:)]) {
+        [obj setYb_totalPage:^NSInteger{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return 0;
+            return [self.dataMediator numberOfCells];
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_backView:)]) {
+        obj.yb_backView = self;
+    }
+    if ([obj respondsToSelector:@selector(setYb_containerView:)]) {
+        obj.yb_containerView = self.containerView;
+    }
+    if ([obj respondsToSelector:@selector(setYb_collectionView:)]) {
+        [obj setYb_collectionView:^__kindof UICollectionView *{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return nil;
+            return self.collectionView;
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_cellIsInCenter:)]) {
+        [obj setYb_cellIsInCenter:^BOOL{
+            __strong typeof(wSelf) self = wSelf;
+            CGFloat pageF = self.collectionView.contentOffset.x / self.collectionView.bounds.size.width;
+            // '0.001' is admissible error.
+            return ABS(pageF - (NSInteger)pageF) <= 0.001;
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_isTransitioning:)]) {
+        [obj setYb_isTransitioning:^BOOL{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return NO;
+            return self.isTransitioning;
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_isShowTransitioning:)]) {
+        [obj setYb_isShowTransitioning:^BOOL{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return NO;
+            return self.isShowTransitioning;
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_isHideTransitioning:)]) {
+        [obj setYb_isHideTransitioning:^BOOL{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return NO;
+            return self.isHideTransitioning;
+        }];
+    }
+    if ([obj respondsToSelector:@selector(setYb_isRotating:)]) {
+        [obj setYb_isRotating:^BOOL{
+            __strong typeof(wSelf) self = wSelf;
+            if (!self) return NO;
+            return self.rotationHandler.isRotating;
+        }];
+    }
+}
+
+#pragma mark - <UICollectionViewDataSource>
+
+- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
+    return [self.dataMediator numberOfCells];
+}
+
+- (UICollectionViewCell *)collectionView:(YBIBCollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
+    id<YBIBDataProtocol> data = [self.dataMediator dataForCellAtIndex:indexPath.row];
+    
+    UICollectionViewCell<YBIBCellProtocol> *cell = [collectionView dequeueReusableCellWithReuseIdentifier:[collectionView reuseIdentifierForCellClass:data.yb_classOfCell] forIndexPath:indexPath];
+    
+    [self implementGetBaseInfoProtocol:cell];
+    [self implementOperateBrowserProtocol:cell];
+    
+    if ([cell respondsToSelector:@selector(setYb_selfPage:)]) {
+        [cell setYb_selfPage:^NSInteger{
+            return indexPath.row;
+        }];
+    }
+    
+    cell.yb_cellData = data;
+    
+    if ([cell respondsToSelector:@selector(yb_pageChanged)]) {
+        [cell yb_pageChanged];
+    }
+    
+    [self.dataMediator preloadWithPage:indexPath.row];
+    
+    return cell;
+}
+
+#pragma mark - <UICollectionViewDelegate>
+
+- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
+    CGFloat pageF = scrollView.contentOffset.x / scrollView.bounds.size.width;
+    NSInteger page = (NSInteger)(pageF + 0.5);
+    
+    for (id<YBIBToolViewHandler> handler in self.toolViewHandlers) {
+        if ([handler respondsToSelector:@selector(yb_offsetXChanged:)]) {
+            [handler yb_offsetXChanged:pageF];
+        }
+    }
+    
+    if (!scrollView.isDecelerating && !scrollView.isDragging) {
+        // Return if not scrolled by finger.
+        return;
+    }
+    if (page < 0 || page > [self.dataMediator numberOfCells] - 1) return;
+    if (self.rotationHandler.isRotating) return;
+    
+    if (page != _currentPage) {
+        _currentPage = page;
+        [self pageNumberChanged];
+    }
+}
+
+#pragma mark - event
+
+- (void)respondsToLongPress:(UILongPressGestureRecognizer *)sender {
+    if (sender.state == UIGestureRecognizerStateBegan) {
+        if ([self.delegate respondsToSelector:@selector(yb_imageBrowser:respondsToLongPressWithData:)]) {
+            [self.delegate yb_imageBrowser:self respondsToLongPressWithData:[self currentData]];
+        } else {
+            for (id<YBIBToolViewHandler> handler in self.toolViewHandlers) {
+                if ([handler respondsToSelector:@selector(yb_respondsToLongPress)]) {
+                    [handler yb_respondsToLongPress];
+                }
+            }
+        }
+    }
+}
+
+#pragma mark - getters & setters
+
+- (YBIBContainerView *)containerView {
+    if (!_containerView) {
+        _containerView = [YBIBContainerView new];
+        _containerView.backgroundColor = UIColor.clearColor;
+        _containerView.layer.masksToBounds = YES;
+    }
+    return _containerView;
+}
+
+- (YBIBCollectionView *)collectionView {
+    if (!_collectionView) {
+        _collectionView = [YBIBCollectionView new];
+        _collectionView.delegate = self;
+        _collectionView.dataSource = self;
+    }
+    return _collectionView;
+}
+- (void)setCurrentPage:(NSInteger)currentPage {
+    NSInteger maxPage = self.dataMediator.numberOfCells - 1;
+    if (currentPage > maxPage) {
+        currentPage = maxPage;
+    }
+    _currentPage = currentPage;
+    if (self.collectionView.superview) {
+        [self collectionViewScrollToPage:currentPage];
+    }
+}
+- (void)setDistanceBetweenPages:(CGFloat)distanceBetweenPages {
+    self.collectionView.layout.distanceBetweenPages = distanceBetweenPages;
+}
+- (CGFloat)distanceBetweenPages {
+    return self.collectionView.layout.distanceBetweenPages;
+}
+
+- (void)setTransitioning:(BOOL)transitioning isShow:(BOOL)isShow {
+    _transitioning = transitioning;
+    _showTransitioning = transitioning && isShow;
+    _hideTransitioning = transitioning && !isShow;
+    
+    // Make 'self.userInteractionEnabled' always 'YES' to block external interaction.
+    self.containerView.userInteractionEnabled = !transitioning;
+    self.collectionView.userInteractionEnabled = !transitioning;
+    
+    if (transitioning) {
+        if ([self.delegate respondsToSelector:@selector(yb_imageBrowser:beginTransitioningWithIsShow:)]) {
+            [self.delegate yb_imageBrowser:self beginTransitioningWithIsShow:isShow];
+        }
+    } else {
+        if ([self.delegate respondsToSelector:@selector(yb_imageBrowser:endTransitioningWithIsShow:)]) {
+            [self.delegate yb_imageBrowser:self endTransitioningWithIsShow:isShow];
+        }
+    }
+}
+
+- (YBIBDataMediator *)dataMediator {
+    if (!_dataMediator) {
+        _dataMediator = [[YBIBDataMediator alloc] initWithBrowser:self];
+        _dataMediator.dataCacheCountLimit = YBIBLowMemory() ? 9 : 27;
+        _dataMediator.preloadCount = YBIBLowMemory() ? 0 : 2;
+    }
+    return _dataMediator;
+}
+- (void)setPreloadCount:(NSUInteger)preloadCount {
+    self.dataMediator.preloadCount = preloadCount;
+}
+- (NSUInteger)preloadCount {
+    return self.dataMediator.preloadCount;
+}
+
+- (YBIBScreenRotationHandler *)rotationHandler {
+    if (!_rotationHandler) {
+        _rotationHandler = [[YBIBScreenRotationHandler alloc] initWithBrowser:self];
+    }
+    return _rotationHandler;
+}
+- (void)setSupportedOrientations:(UIInterfaceOrientationMask)supportedOrientations {
+    self.rotationHandler.supportedOrientations = supportedOrientations;
+}
+- (UIInterfaceOrientationMask)supportedOrientations {
+    return self.rotationHandler.supportedOrientations;
+}
+- (UIDeviceOrientation)currentOrientation {
+    return self.rotationHandler.currentOrientation;
+}
+
+@end