iOS事件传递

假如想让一个控件能有点击效果，那么该控件的所有父控件，及父控件以上的父控件，还有该控件本身，userInteractionEnabled 肯定要为YES；而该控件的子控件userInteractionEnabled 不论是YES还是NO都不影响。

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代码如下

/// 事件点击层级- (void)testOne{    self.redView = [[UIView alloc]init];    [self.view addSubview:self.redView];    [self.redView mas_makeConstraints:^(MASConstraintMaker *make) {        make.left.right.equalTo(self.view);        make.height.mas_equalTo(300);        make.top.equalTo(self.view.mas_top).offset(84);    }];    self.redView.backgroundColor = [UIColor redColor];    self.redView.userInteractionEnabled = YES;//此处必需为YES        self.yellowView = [[UIView alloc]init];    [self.redView addSubview:self.yellowView];    [self.yellowView mas_makeConstraints:^(MASConstraintMaker *make) {        make.center.equalTo(self.redView);        make.width.height.mas_equalTo(200);    }];    self.yellowView.backgroundColor = [UIColor yellowColor];    self.yellowView.userInteractionEnabled = YES;//此处必需为YES            self.cyanView = [[UIView alloc]init];    [self.yellowView addSubview:self.cyanView];    [self.cyanView mas_makeConstraints:^(MASConstraintMaker *make) {        make.center.equalTo(self.yellowView);        make.height.mas_equalTo(100);        make.width.mas_equalTo(100);    }];    self.cyanView.backgroundColor = [UIColor cyanColor];    self.cyanView.userInteractionEnabled = YES;//此处也可以为NO或者者YES            [self addEventMethod];}- (void)addEventMethod{    [self.yellowView bk_whenTapped:^{        NSLog(@"点击了黄色模块了");    }];}