事件传递之hitTest方法

当点击黄色UIVIew覆盖的UIButton时触发UIButton事件否则触发UIView触摸事件用点是否在控件上做判断

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {    NSLog(@"%s", __func__);}- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {    //坐标转换    CGPoint btnP = [self convertPoint:point toView:self.btn];    //坐标在不在按钮上在的话返回按钮否则返回自己    if ([self.btn pointInside:btnP withEvent:event]) {        return self.btn;    } else {        return self;    }    }