NSString *path = [[NSBundle mainBundle] pathForResource:@"a" ofType:@"gif"];
    //        NSURL *url = [NSURL URLWithString:path];
    NSLog(@"======%@",path);
    
    NSURL *fileUrl = [NSURL fileURLWithPath:path];
    
    CGImageSourceRef gifSource = CGImageSourceCreateWithURL((CFURLRef)fileUrl, NULL);
    
    size_t frameCout = CGImageSourceGetCount(gifSource);
    
    NSMutableArray *sizeArray = [NSMutableArray arrayWithCapacity:0];
    
    for (size_t i=0; i<frameCout; i++) {
        
        CGImageRef imageRef = CGImageSourceCreateImageAtIndex(gifSource, i, NULL); //從GIF圖片中取出源圖片
        
        UIImage *imageName = [UIImage imageWithCGImage:imageRef];
        
        [sizeArray addObject:imageName];
        
        CGImageRelease(imageRef);
    }