/** Gif的步骤

 1. 拿到Gifd的数据

 2. 将Gif分解为一帧帧

 3. 将单帧数据转为UIImage

 4. 单帧图片保存

 */

#import <ImageIO/ImageIO.h>     // 图像的输入输出文件

#import <MobileCoreServices/MobileCoreServices.h>

- (void)didCompositionGif {

    //1. 拿到gif数据

    NSString * gifPathSource = [[NSBundle mainBundle] pathForResource:@"kobe" ofType:@"gif"];

    NSData * data = [NSData dataWithContentsOfFile:gifPathSource];

#warning 桥接的意义 (__bridge CFDataRef)

    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);

    //2. 将gif分解为一帧帧

    size_t count = CGImageSourceGetCount(source);

    NSLog(@"%zu",count);

    NSMutableArray * tmpArray = [NSMutableArray arrayWithCapacity:];

    for (int i = ; i < count; i ++) {

        CGImageRef imageRef = CGImageSourceCreateImageAtIndex(source, i, NULL);

        //3. 将单帧数据转为UIImage

        UIImage * image = [UIImage imageWithCGImage:imageRef scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp];

        [tmpArray addObject:image];

#warning CG类型的对象 不能用ARC自动释放内存.需要手动释放

        CGImageRelease(imageRef);

    }

    CFRelease(source);

    // 单帧图片保存

    int i = ;

    for (UIImage * image  in tmpArray) {

        i ++;

        NSData * data = UIImagePNGRepresentation(image);

        NSArray * path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

        NSString * gifPath = path[];

        NSLog(@"gifPath: %@",gifPath);

        NSString * pathNum = [gifPath stringByAppendingString:[NSString stringWithFormat:@"%d.png",i]];

        [data writeToFile:pathNum atomically:NO];

    }

}