识别不在某个子视图中的手势

发布于 2024-11-16 02:56:45 字数 1253 浏览 4 评论 0原文

我想使用 UIGestureRecognizers 来区分两种手势：发生在迷你 UIView 中的手势和发生在视图中其他任何位置的手势。

我认为我可以使用 requireGestureRecognizerToFail 通过两个 GestureRecognizer 来完成此任务。但是，父视图的 GestureRecognizer 永远不会触发。这是为什么呢？

下面是一个演示性测试用例：

-(void)viewDidLoad {

    UIView *miniView = [[[UIView alloc] initWithFrame:CGRectMake(100,100,20,20)] autorelease];
    miniView.backgroundColor = [UIColor redColor];
    [self.view addSubview:miniView];

    // triggered when you tap the miniView
    UITapGestureRecognizer *miniTap = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(miniTap:)] autorelease];
    [miniView addGestureRecognizer:miniTap];

    // expected: triggered when you tap anywhere outside the mini-view
    // actual: never triggered!
    UITapGestureRecognizer *nonMiniTap = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(nonMiniTap:)] autorelease];
    [nonMiniTap requireGestureRecognizerToFail:miniTap];
    [self.view addGestureRecognizer:nonMiniTap];


    [super viewDidLoad];
}


-(void)miniTap:(id)sender { NSLog(@"miniTap"); }

-(void)nonMiniTap:(id)sender { NSLog(@"nonMiniTap"); }

Why does requireGestureRecognizerToFail: Prevent nonMiniTap from being触发？我可以让它按照预期的方式运行吗？

原文

I would like to use UIGestureRecognizers to distinguish between two kinds of gestures: those occurring in a mini-UIView and those occurring anywhere else in the view.

I thought I could accomplish this with two GestureRecognizers using requireGestureRecognizerToFail. However, the parent view's GestureRecognizer never fires. Why is this?

Here is a demonstrative test case:

-(void)viewDidLoad {

    UIView *miniView = [[[UIView alloc] initWithFrame:CGRectMake(100,100,20,20)] autorelease];
    miniView.backgroundColor = [UIColor redColor];
    [self.view addSubview:miniView];

    // triggered when you tap the miniView
    UITapGestureRecognizer *miniTap = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(miniTap:)] autorelease];
    [miniView addGestureRecognizer:miniTap];

    // expected: triggered when you tap anywhere outside the mini-view
    // actual: never triggered!
    UITapGestureRecognizer *nonMiniTap = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(nonMiniTap:)] autorelease];
    [nonMiniTap requireGestureRecognizerToFail:miniTap];
    [self.view addGestureRecognizer:nonMiniTap];


    [super viewDidLoad];
}


-(void)miniTap:(id)sender { NSLog(@"miniTap"); }

-(void)nonMiniTap:(id)sender { NSLog(@"nonMiniTap"); }

Why does requireGestureRecognizerToFail: prevent nonMiniTap from ever being triggered? Can I make it behave in the expected way?

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度的依靠╰つ 2024-11-23 02:56:45

如果您看到 requireGestureRecognizerToFail 的文档：，明确指出手势的状态不会从UIGestureRecognizerStatePossible 直到另一个手势转换为 UIGestureRecognizerStateFailed 或 UIGestureRecognizerStateRecognized。但由于 miniTap 手势不会移出其默认的 UIGestureRecognizerStatePossible 状态，因为触摸不在其视图内，因此 nonMiniTap 手势没认出来。因此，您对父视图的点击失败了。

因此不需要依赖。你可以把那条线取下来，它应该按照你想要的方式工作。