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.