如何检测子视图中的点击手势 [英] How to detect a tap gesture in subviews

问题描述

快速问题:我如何检测点击手势识别器是否在它添加到的视图的子视图中?例如.如果我点击一个对象，例如一个作为子视图添加到背景中的对象，该背景已经添加了点击手势识别器，我如何检测它已被点击?

Quick question: how do i detect if a tap gesture recognizer is within a subview of the view it is added to? Eg. if i click on an object such as a square that has been added as a subview to a background which a tap gesture recognizer has been added to, how do I detect that it has been tapped?

推荐答案

当您使用 -locationInView 为您希望的任何视图调用处理程序方法时，您可以抓住手势识别器的点击点:.然后，在 UIView 上使用以下方法: - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event 获取对被点击的实际子视图的引用，记住点您传入的坐标空间与视图相同.

You can grab the point of the tap off the gesture recognizer when your handler method is called respective to any view you wish using -locationInView:. Then, use the following method on UIView: - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event to get a reference to the actual sub view that was tapped remembering that the point you pass in is in the same coordinate space as the view.

一些帮助您入门的代码:

Some code to get you started:

CGPoint point = [tapGestureRecognizer locationInView:parentView];
UIView *tappedView = [parentView hitTest:point withEvent:nil];

为了使命中测试工作，视图需要将 userInteractionEnabled 属性设置为 YES.许多视图，例如 UILabels 默认设置为 NO.所以在上述之前:

For hit testing to work the view needs to have the userInteractionEnabled property set to YES. Many views, such as UILabels have this set to NO by default. So prior to the above:

self.subviewOfInterest.userInteractionEnabled = YES;

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