将Gif转换为动画UIImage时，每个帧的延迟是从属性kCGImagePropertyGIFDelayTime或kCGImagePropertyGIFUnclampedDelayTime中提取的像这样:NSString*frameKeyPath=[NSStringstringWithFormat:@"%@.%@",(NSString*)kCGImagePropertyGIFDictionary,kCGImagePropertyGIFUnclampedDelayTime];CFDictionaryRefcfFrameProperties=CGImageSourceCopyPropert