86 lines
3.1 KiB
Objective-C
Executable File
86 lines
3.1 KiB
Objective-C
Executable File
//
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// ZJImageMagnification.m
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//
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// Created by degulade on 2017/4/21.
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// Copyright © 2017年 degulade. All rights reserved.
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/*图片放大*/
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#import "ZJImageMagnification.h"
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@implementation ZJImageMagnification
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//原始尺寸
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static CGRect oldframe;
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/**
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* 浏览大图
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*
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* @param currentImageview 当前图片
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* @param alpha 背景透明度
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*/
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+(void)scanBigImageWithImageView:(UIImageView *)currentImageview alpha:(CGFloat)alpha {
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// 当前imageview的图片
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UIImage *image = currentImageview.image;
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// 当前视图
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UIWindow *window = [UIApplication sharedApplication].keyWindow;
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// 背景
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UIView *backgroundView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
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// 当前imageview的原始尺寸->将像素currentImageview.bounds由currentImageview.bounds所在视图转换到目标视图window中，返回在目标视图window中的像素值
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oldframe = [currentImageview convertRect:currentImageview.bounds toView:window];
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[backgroundView setBackgroundColor:[UIColor blackColor]];
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// 此时视图不会显示
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[backgroundView setAlpha:0];
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// 将所展示的imageView重新绘制在Window中
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UIImageView *imageView = [[UIImageView alloc] initWithFrame:oldframe];
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[imageView setImage:image];
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imageView.contentMode =UIViewContentModeScaleAspectFit;
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[imageView setTag:1024];
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[backgroundView addSubview:imageView];
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// 将原始视图添加到背景视图中
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[window addSubview:backgroundView];
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// 添加点击事件同样是类方法 -> 作用是再次点击回到初始大小
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UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideImageView:)];
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[backgroundView addGestureRecognizer:tapGestureRecognizer];
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// 动画放大所展示的ImageView
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[UIView animateWithDuration:0.4 animations:^{
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CGFloat y,width,height;
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y = ([UIScreen mainScreen].bounds.size.height - image.size.height * [UIScreen mainScreen].bounds.size.width / image.size.width) * 0.5;
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//宽度为屏幕宽度
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width = [UIScreen mainScreen].bounds.size.width;
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//高度 根据图片宽高比设置
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height = image.size.height * [UIScreen mainScreen].bounds.size.width / image.size.width;
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[imageView setFrame:CGRectMake(0, y, width, height)];
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//重要！ 将视图显示出来
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[backgroundView setAlpha:1];
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} completion:^(BOOL finished) {
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}];
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}
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/**
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* 恢复imageView原始尺寸
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*
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* @param tap 点击事件
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*/
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+(void)hideImageView:(UITapGestureRecognizer *)tap{
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UIView *backgroundView = tap.view;
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// 原始imageview
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UIImageView *imageView = [tap.view viewWithTag:1024];
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// 恢复
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[UIView animateWithDuration:0.4 animations:^{
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[imageView setFrame:oldframe];
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[backgroundView setAlpha:0];
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} completion:^(BOOL finished) {
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//完成后操作->将背景视图删掉
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[backgroundView removeFromSuperview];
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}];
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}
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@end
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