道理差不多，简单写写，就是给UIImage所在的UIImageView添加个单击的手势，让用户点击图片时有响应的响应。 有人用个透明的UIButton，感觉有时候不方便。

- (void)viewDidLoad
{
   UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];
    imageView.userInteractionEnabled = YES;
    UITapGestureRecognizer *singleTap = 
      [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(whenClickImage)];
    [imageView addGestureRecognizer:singleTap];
    [imageView setImage:[UIImage imageNamed:@"1.png"]];
    [singleTap release];
    [self.view addSubview: imageView];

}

-(void)whenClickImage
{
    NSLog(@"you click image");
}

不仅UIImageView可以添加，UIScrollView上也可以。还可以添加其他双击旋转等手势。 比较简单实用。