iOS:拦截从顶 View 到底 View 的点击手势事件

Question

在我的 View Controller 中，我将 UITapGestureRecognizer 添加到 self.view。我在 self.view 之上添加了一个小 View 。当我点击小 View 时，我不想触发 self.view 中的 UITapGestureRecognizer 事件。这是我的代码，它不起作用。

    - (void)viewDidLoad {
    [super viewDidLoad];

    UITapGestureRecognizer *_tapOnVideoRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(toggleControlsVisible)];

    [self.view addGestureRecognizer:_tapOnVideoRecognizer];

    UIView *smallView=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
    smallView.backgroundColor=[UIColor redColor];
    smallView.exclusiveTouch=YES;
    smallView.userInteractionEnabled=YES;

    [self.view addSubview:smallView];
    }

    - (void)toggleControlsVisible
    {
        NSLog(@"tapped");
    }

当我点击小 View 时，它仍然会触发 self.view 中的点击事件。 Xcode 记录“点击”。如何拦截smallView到self.view的手势事件？

Answer 1

像这样实现 UIGestureRecognizer 委托(delegate)方法 shouldReceiveTouch。如果触摸位置在 topView 内部，则不接收触摸。

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    CGPoint location = [touch locationInView:self.view];

    if (CGRectContainsPoint(self.topView.frame, location)) {
        return NO;
    }
   return YES;
}