//獲取gif圖片的總時長和循環(huán)次數(shù)
- (NSTimeInterval)durationForGifData:(NSData *)data{ 
    //將GIF圖片轉(zhuǎn)換成對應(yīng)的圖片源
    CGImageSourceRef gifSource = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
    //獲取其中圖片源個數(shù)厅缺，即由多少幀圖片組成
    size_t frameCout = CGImageSourceGetCount(gifSource);
    //定義數(shù)組存儲拆分出來的圖片
    NSMutableArray* frames = [[NSMutableArray alloc] init];
    NSTimeInterval totalDuration = 0;
    for (size_t i=0; i<frameCout; i++) {
        //從GIF圖片中取出源圖片
        CGImageRef imageRef = CGImageSourceCreateImageAtIndex(gifSource, i, NULL);
        //將圖片源轉(zhuǎn)換成UIimageView能使用的圖片源
        UIImage* imageName = [UIImage imageWithCGImage:imageRef];
        //將圖片加入數(shù)組中
        [frames addObject:imageName];
        NSTimeInterval duration = [self gifImageDeleyTime:gifSource index:i];
        totalDuration += duration;
        CGImageRelease(imageRef);
    }

   //獲取循環(huán)次數(shù)   
    NSInteger loopCount;//循環(huán)次數(shù)
    CFDictionaryRef properties = CGImageSourceCopyProperties(gifSource, NULL);
    if (properties) {
        CFDictionaryRef gif = CFDictionaryGetValue(properties, kCGImagePropertyGIFDictionary);
        if (gif) {
            CFTypeRef loop = CFDictionaryGetValue(gif, kCGImagePropertyGIFLoopCount);
            if (loop) {
         //如果loop == NULL渴频，表示不循環(huán)播放翅娶，當loopCount  == 0時，表示無限循環(huán)；
           CFNumberGetValue(loop, kCFNumberNSIntegerType, &loopCount)
      };
        }
    }

    CFRelease(gifSource);
    return totalDuration;
}

循環(huán)次數(shù)的鍵：kCGImagePropertyGIFLoopCount

無限循環(huán)播放.png

不循環(huán)播放.png

時間間隔的鍵：kCGImagePropertyGIFUnclampedDelayTime

每一幀時間間隔.png

 //獲取GIF圖片每幀的時長
- (NSTimeInterval)gifImageDeleyTime:(CGImageSourceRef)imageSource index:(NSInteger)index {
    NSTimeInterval duration = 0;
    CFDictionaryRef imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, index, NULL);
    if (imageProperties) {
        CFDictionaryRef gifProperties;
        BOOL result = CFDictionaryGetValueIfPresent(imageProperties, kCGImagePropertyGIFDictionary, (const void **)&gifProperties);
        if (result) {
            const void *durationValue;
            if (CFDictionaryGetValueIfPresent(gifProperties, kCGImagePropertyGIFUnclampedDelayTime, &durationValue)) {
                duration = [(__bridge NSNumber *)durationValue doubleValue];
                if (duration < 0) {
                    if (CFDictionaryGetValueIfPresent(gifProperties, kCGImagePropertyGIFDelayTime, &durationValue)) {
                        duration = [(__bridge NSNumber *)durationValue doubleValue];
                    }
                }
            }
        }
    }
    
    return duration;
}