ios-UIPinchGestureRecognizer和UIImageView的問題

UIPinchGestureRecognizer和UIImageView的問題

我想要通過UIPinchGestureRecognizer來對圖片操作，但是代碼運行之後不是很理想，而且不能縮放

代碼如下：

-(void) pinching: (UIPinchGestureRecognizer *) sender {

    CGAffineTransform myTransformation =
    CGAffineTransformMakeScale(sender.scale, sender.scale);
    sender.view.transform = myTransformation;
}


- (void)viewDidLoad
{
  UIPinchGestureRecognizer *pinch =
    [[UIPinchGestureRecognizer alloc]
     initWithTarget:self
     action:@selector(pinching:)];

    pinch.delegate = self;

    [imageBG addGestureRecognizer:pinch];

    [imageBG setUserInteractionEnabled:YES];
    [imageBG setMultipleTouchEnabled:YES];
}

最佳回答：

把UIImageView放到一個UIScrollView裡,並實現UIScrollVIew的代理方法viewForZoomingInScrollView返回UIImageVIew
UIScrollView還需要設置一下maximumZoomScale.