我在 UIScrollView(0,0,500,500) 中有一个 UIView(0,0,1000,1000) 作为 UIScrollView 的内容，这是我的代码：
//ScrollView setting
ScrollView.minimumZoomScale = 0.5;
ScrollView.maximumZoomScale = 1.0;
ScrollView.contentSize = View.frame.size
ScrollView.delegate = self;
//Get the tapped point & Place a mark on it
//already add an UITapGestureRecognizer on View
CGPoint tapped = [tapRecognizer locationInView:View];
UIView mark = [[UIView alloc] initWithFrame:CGRectMake(tapped.x-25,tapped.y-25,50,50)];
[View addSubview:mark];
//Centering the tapped point (1.0x)
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGPoint screenCenter = CGPointMake(screenRect.size.width/2,screenRect.size.height/2);
[ScrollView setContentOffset:(tapped-screenCenter.x, tapped-screenCenter.y) animated:YES];
当 UIScrollView 缩放比例为 1.0x 时，这工作正常，但是当我将其缩放到 0.5x 并修改如下代码时：
//Get zoom scale
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{
CGfloat zoomScale = scale;
}
//Centering the tapped point (0.5x)
[ScrollView setContentOffSet:(tapped-screenCenter.x/zoomScale, tapped-screenCenter.y/zoomScale) animated:YES];
它没有按我的预期工作，请帮我解决。