ios点击事件透传

例如：在控制器view上添加一个橙色view，再添加一个透明度为0.9的蓝色view覆盖住橙色view
实现点击蓝色view时，如果触摸的点在橙色view范围内，则响应橙色view的点击事件
效果图如下：

image.png

布局为:

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = UIColor.whiteColor;
    OrangeView *sec = [OrangeView new];
    sec.backgroundColor = UIColor.orangeColor;
    sec.frame = CGRectMake(150, 150, 100, 100);
    [self.view addSubview:sec];
    UITapGestureRecognizer *tap2 = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(secTap)];
    [sec addGestureRecognizer:tap2];
    BlueView *fir = [BlueView new];
    fir.backgroundColor = [UIColor hexColor:@"3275FD" alpha:0.9];
    fir.frame = CGRectMake(100, 100, 200, 200);
    [self.view addSubview:fir];
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(firTap)];
    [fir addGestureRecognizer:tap];
}
- (void)firTap{
    NSLog(@"点击了蓝色");
}
- (void)secTap{
    NSLog(@"点击了橙色");
}

蓝色view重写hitTest方法判断点是否在橙色view的rect范围

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
    UIView *hitView = [super hitTest:point withEvent:event];
    //判断点是否在rect范围
    //获取相对上层控件的rect
    CGRect rect = CGRectMake(150-100, 150-100, 100, 100);
    BOOL isRect = CGRectContainsPoint(rect, point);
    if (isRect) {
        return nil;
    }else{
        return hitView;
    }
}

扩展：
判断rect1是否在rect2范围内
CGRectContainsRect(rect2, rect1);