iOS 判断gif图

CGImageSourceRef source0 = CGImageSourceCreateWithURL((CFURLRef)[NSURL URLWithString:_item.permalink], NULL);
        
CFDataRef dataRef = CGDataProviderCopyData(CGImageGetDataProvider(aImage.CGImage));
CGImageSourceRef source = CGImageSourceCreateWithData(dataRef, NULL);
NSLog(@"source = %@ + %@",source,source0);

NSDictionary* properties = (NSDictionary*)CGImageSourceCopyProperties(source, NULL);
NSDictionary* gifProperties = [properties objectForKey:(NSString*)kCGImagePropertyGIFDictionary];
NSLog(@"properties: %@,gifProperties: %@, source = %@",properties,gifProperties,CGImageSourceGetType(source));
if (gifProperties != nil && [@"com.compuserve.gif" isEqualToString:[NSString stringWithFormat:@"%@",CGImageSourceGetType(source)]]) {
    
    _imgGIF = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"GIF.png"]];
    [_imgGIF setFrame:CGRectMake(photoIV.frame.size.width - 5.0f - _imgGIF.width, photoIV.frame.size.height - 5.0f - _imgGIF.height, _imgGIF.width, _imgGIF.height)];
    [photoIV addSubview:_imgGIF];
} else {
    _imgGIF = nil;
}