UIImageView添加响应事件无响应

通常给UIImageView添加响应按如下方法：

UIImageView *newView = [[UIImageView alloc]initWithFrame:CGRectMake(x, y, IMG_WIDTH, IMG_HEIGHT)];
        newView.userInteractionEnabled = YES;
        newView.tag = i;
        
        UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self
                                                                                    action:@selector(TakePhotoFor:)];  
        [newView addGestureRecognizer:singleTap];
        [singleTap release];
        
        //加载已经拍摄的图片
        [newView setImage:[UIImage imageNamed:@"MPV.png"]];        
        
        [self.view addSubview:newView];
        [newView release];

但是今天我在一个循环里创建N个UIImageView，然后在循环外创建的UITapGestureRecognizer，结果点击后就没响应。后来查资料发现Gesture recognizers can be associated to a single view only。也就是要在循环内为每个UIImageView创建并添加UITapGestureRecognizer。

like this:

  for (i = 0; i<18; i++) {
        x = StartX + (i%6)*OFFSET_X;
        y = StartY + (i/6)*OFFSET_Y;
        
        UIImageView *newView = [[UIImageView alloc]initWithFrame:CGRectMake(x, y, IMG_WIDTH, IMG_HEIGHT)];
        newView.userInteractionEnabled = YES;
        newView.tag = i;
        
        UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self
                                                                                    action:@selector(TakePhotoFor:)];  
        [newView addGestureRecognizer:singleTap];
        [singleTap release];
        
        //加载已经拍摄的图片
        [newView setImage:[UIImage imageNamed:@"MPV.png"]];        
        
        [self.view addSubview:newView];
        [newView release];
    }

问题解决。