Image comparison

  UIImage *image1 = [UIImage imageNamed:@"EmptyLike"];

    UIImage *image2 = [button_image imageForState:UIControlStateNormal];

    

    NSData *data1 = UIImagePNGRepresentation(image1);

    NSData *data2 = UIImagePNGRepresentation(image2);

    if ([data1 isEqualToData:data2]) {

}