每当两个UIImageView重叠时，我如何检测？ [英] How do I detect whenever two UIImageView overlap?

问题描述

我有两个UIImageViews，其中一个是从左向右移动，另一个是触摸可拖动。我希望NSLog在控制台上显示一条消息，只要imagetwo重叠imageone。我该怎么做？

I have two UIImageViews, one of them is moving from left to right, the other one is touch draggable. iI want NSLog to show up a message on console whenever imagetwo overlaps imageone. How Do I do this?

推荐答案

你可以使用 CGRectIntersectsRect 函数如果UIImageViews共享相同的superview（更准确地说，具有相同的坐标空间），可以轻松测试矩形交集。

You can use the CGRectIntersectsRect function to easily test rectangle intersection, provided the UIImageViews share the same superview (more exactly, have the same coordinate space).

可能需要添加如下代码：

Likely you will need to add code like the following:

  -(void) touchesEnded:(NSSet *) touches {
    if(CGRectIntersectsRect([imageViewA frame], [imageViewB frame])) {
      NSLog(@"Do something.");
    }
  }

到托管两个图像视图的UIView，或者拖动完成时调用的类似方法。

to the UIView that hosts both image views, or a similar method that is called whenever the drag is completed.

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