案例說明：點擊下圖子控件，會觸發(fā)父控件的點擊事件

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解決方法1：

給子控件添加空事件、或者子控件實例為UIButton,添加空事件

解決方法2：事件攔截

 tap.delegate = self;

#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
    // self.contentView為子控件
    if ([touch.view isDescendantOfView:self.contentView]) {
        return NO;
    }
    return YES;
}

解決方法3：控制點擊區(qū)域 使用RAC手勢為例

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]init];
    tap.delegate = self;
    [self addGestureRecognizer:tap];
    @weakify(self);
    [[tap rac_gestureSignal] subscribeNext:^(UITapGestureRecognizer *tap) {
        @strongify(self);
        if(CGRectContainsPoint(self.frame, [tap locationInView:self.contentView])) {
            // 相當于點擊了子控件
        } else{
            // 相當于點擊了父控件
        };
    }];