给View添加手势,防止点击View上其他视图触发点击效果

• 在开发过程中,我们可能会遇到这个问题. 当我们给一个view添加了手势,但是我们又不想点击view上面的视图也触发手势.如下图:
  我们在红色view上添加了手势,但是又不想点击黄色view也触发.其实这里用到UITapGestureRecognizer的一个代理方法

• 上代码,先创建两个view,并且给bigView添加手势

    self.bigView = [[UIView alloc]initWithFrame:CGRectMake(50, 50, 100, 100)];
    self.bigView.backgroundColor = [UIColor redColor];
    UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(bigMap:)];
    
    // 手势代理
    recognizer.delegate = self;
    [self.bigView addGestureRecognizer:recognizer];
    [self.view addSubview:self.bigView];
  
    self.smallView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 50, 50)];
    self.smallView.backgroundColor = [UIColor yellowColor];
    [self.bigView addSubview:self.smallView];
  

• 接着,在手势代理方法UIGestureRecognizerDelegate中

    // 拦截点击事件,只让添加了手势的view响应事件
    - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
  
    	if ([touch.view isDescendantOfView:self.smallView]) {
    		return NO;
    	}
    	return YES;
    }
  

• OK,处理完成.