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;
}

}