视图超出视图边界

Question

我有一个背景视图(UIImageView)，因为我正在添加一个视图(UIView)。本contentView(UIView)包含UIPanGestureRecognizer。

我通过下面的代码将UIPanGestureRecognizer赋给contentView：

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(movePhoto:)];
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setDelegate:self];
[contentView addGestureRecognizer:panRecognizer];
[panRecognizer release];

然后我通过下面的代码将这个contentView添加到背景视图(UIImageView)中：

[imgBG addSubview:contentView]; // here imgBG is Background view.

但是当我移动这个contentView时，它会从imgBG中移出。

bellow是移动contentView的方法

    [[[(UITapGestureRecognizer*)sender view] layer] removeAllAnimations];

[self.view bringSubviewToFront:[(UIPanGestureRecognizer*)sender view]];
CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:self.view];

if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) 
{
    firstX = [[sender view] center].x;
    firstY = [[sender view] center].y;
}
translatedPoint = CGPointMake(firstX+translatedPoint.x, firstY+translatedPoint.y);
[[sender view] setCenter:translatedPoint];

CGFloat finalX = [sender view].center.x;
CGFloat finalY = [sender view].center.y;
[[sender view] setCenter:CGPointMake(finalX, finalY)];

我认为，这里的contentView应该保留在imgBG中，因为它是imgBG的子视图。

请让我知道我的代码中是否有问题，或者是由于UIPanGestureRecognizer。

提前谢谢。

Answer 1

我只是不得不这么做：

[imgBG setClipsToBounds:YES];