iOS判断当前点击的位置是否在某个视图上

记录几种判断触摸点是否在某个view上面的方法

• 第一种方式：isDescendantOfView:

  通过touch.view调用 isDescendantOfView: 方法，返回 YES, 则触摸点在我们需要判断的视图上；反之则不在。

  - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
  
      UITouch *touch = [touches.allObjects lastObject];
      BOOL result = [touch.view isDescendantOfView:self.blueView];
      NSLog(@"%@点击在蓝色视图上", result ? @"是" : @"不是");
  }
  
  

• 第二种方式：locationInView: 和 containsPoint 结合使用

  - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
  
      UITouch *touch = [touches.allObjects lastObject];
      CGPoint point = [touch locationInView:self.blueView];
      BOOL result = [self.blueView.layer containsPoint:point];
      NSLog(@"%@点击在蓝色视图上", result ? @"是" : @"不是");
  }
  

• 第三种方式：locationInView: 和 CGRectContainsPoint 结合使用

  locationView 如果传入的是需要判断视图(self.blueView)的父视图，CGRectContainsPoint则需要传入需要判断视图(self.blueView)的frame，否则传入 bounds.

  - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {   
  
      UITouch *touch = [touches.allObjects lastObject];
      CGPoint point = [touch locationInView:self.blueView];
      BOOL result = CGRectContainsPoint(self.blueView.bounds, point);
      NSLog(@"这次%@点击在蓝色视图上", result ? @"是" : @"不是");
  }
  

• 第四种方式：坐标转换convertPoint:fromLayer: 再判断是否是在该视图范围内 containsPoint:

  - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {   
  
      CGPoint point = [[touches anyObject] locationInView:self.view];
      point = [self.blueView.layer convertPoint:point fromLayer:self.view.layer];
      BOOL result = [self.blueView.layer containsPoint:point];
      NSLog(@"%@点击在蓝色视图上", result ? @"是" : @"不是");
  }