Check image get from URL is valid or corrupted or URL return another type of data (JSON, garbage data ...)

image-data-validation.m

- (void)isImageDataValid:(NSURL *)imageURL
{
    dispatch_async(dispatch_queue_create("CheckImage", NULL), ^{
       
        NSData *data   = [NSData dataWithContentsOfURL:imageURL];
        UIImage *image = [UIImage imageWithData:data];
        if (image == nil) {
            // imageURL is not valid
            TLog(@"imageURL NOT valid: %@", imageURL);
        }
        else {
            // imageURL is valid
            TLog(@"imageURL VALID: %@", imageURL);
            dispatch_async(dispatch_get_main_queue(), ^{
                UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
                //show your image
            });
        }
    });
}