mier_ios/SweetParty/Expand/Category/UIImage+Additions.m

//
//  UIImage+Additions.m
//  GoldCow
//
//  Created by haiwei on 15/6/1.
//  Copyright (c) 2015年 ddsfsdfsd. All rights reserved.
//

#import "UIImage+Additions.h"

#import <ImageIO/ImageIO.h>

@implementation UIImage (Additions)

+ (UIImage *)imageWithColor:(UIColor *)color withSize:(CGSize)size {
    
    CGRect rect = CGRectMake(0.0f, 0.0f, size.width, size.height);
    UIGraphicsBeginImageContext(size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    
    UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return image;
}

+ (UIImage *)imageWithColor:(UIColor *)color {
    return [UIImage imageWithColor:color withSize:CGSizeMake(1, 1)];
}


- (UIImage *)imageByCropToRect:(CGRect)rect {
    rect.origin.x *= self.scale;
    rect.origin.y *= self.scale;
    rect.size.width *= self.scale;
    rect.size.height *= self.scale;
    if (rect.size.width <= 0 || rect.size.height <= 0) return nil;
    CGImageRef imageRef = CGImageCreateWithImageInRect(self.CGImage, rect);
    UIImage *image = [UIImage imageWithCGImage:imageRef scale:self.scale orientation:self.imageOrientation];
    CGImageRelease(imageRef);
    return image;
}

+ (UIImage *)sd_animatedGIFNamed:(NSString *)name {
    CGFloat scale = [UIScreen mainScreen].scale;
    
    if (scale > 1.0f) {
        NSString *retinaPath = [[NSBundle mainBundle] pathForResource:[name stringByAppendingString:@"@2x"] ofType:@"gif"];
        
        NSData *data = [NSData dataWithContentsOfFile:retinaPath];
        
        if (data) {
            return [UIImage animatedGIFWithData:data];
        }
        
        NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:@"gif"];
        
        data = [NSData dataWithContentsOfFile:path];
        
        if (data) {
            return [UIImage animatedGIFWithData:data];
        }
        
        return [UIImage imageNamed:name];
    }
    else {
        NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:@"gif"];
        
        NSData *data = [NSData dataWithContentsOfFile:path];
        
        if (data) {
            return [UIImage animatedGIFWithData:data];
        }
        
        return [UIImage imageNamed:name];
    }
}

+ (UIImage *)animatedGIFWithData:(NSData *)data {
    if (!data) {
        return nil;
    }
    
    //获取数据源
    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
    
    // 获取图片数量(如果传入的是gif图的二进制，那么获取的是图片帧数)
    size_t count = CGImageSourceGetCount(source);
    
    UIImage *animatedImage;
    
    if (count <= 1) {
        animatedImage = [[UIImage alloc] initWithData:data];
    }
    else {
        NSMutableArray *images = [NSMutableArray array];
        
        NSTimeInterval duration = 0.0f;
        
        for (size_t i = 0; i < count; i++) {
            CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL);
            
            duration += [UIImage frameDurationAtIndex:i source:source];
            
            [images addObject:[UIImage imageWithCGImage:image scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp]];
            
            CGImageRelease(image);
        }
        // 如果上面的计算播放时间方法没有成功，就按照下面方法计算
        // 计算一次播放的总时间：每张图播放1/10秒 * 图片总数
        if (!duration) {
            duration = (1.0f / 10.0f) * count;
        }
        
        animatedImage = [UIImage animatedImageWithImages:images duration:duration];
    }
    
    CFRelease(source);
    
    return animatedImage;
}

+ (float)frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source {
    float frameDuration = 0.1f;
    // 获取这一帧的属性字典
    CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil);
    NSDictionary *frameProperties = (__bridge NSDictionary *)cfFrameProperties;
    NSDictionary *gifProperties = frameProperties[(NSString *)kCGImagePropertyGIFDictionary];
    
    // 从字典中获取这一帧持续的时间
    NSNumber *delayTimeUnclampedProp = gifProperties[(NSString *)kCGImagePropertyGIFUnclampedDelayTime];
    if (delayTimeUnclampedProp) {
        frameDuration = [delayTimeUnclampedProp floatValue];
    }
    else {
        
        NSNumber *delayTimeProp = gifProperties[(NSString *)kCGImagePropertyGIFDelayTime];
        if (delayTimeProp) {
            frameDuration = [delayTimeProp floatValue];
        }
    }
    
    // Many annoying ads specify a 0 duration to make an image flash as quickly as possible.
    // We follow 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.
    
    if (frameDuration < 0.011f) {
        frameDuration = 0.100f;
    }
    
    CFRelease(cfFrameProperties);
    return frameDuration;
}

+ (UIImage *)xy_getVideoThumbnail:(NSString *)filePath
{
    NSURL *sourceURL = [NSURL fileURLWithPath:filePath];
    AVAsset *asset = [AVAsset assetWithURL:sourceURL];
    AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
    imageGenerator.appliesPreferredTrackTransform = YES;
    CMTime time = CMTimeMake(0, 1);
    NSError *error;
    CGImageRef imageRef = [imageGenerator copyCGImageAtTime:time actualTime:NULL error:&error];
    UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);  // CGImageRef won't be released by ARC
    return thumbnail;
}
@end