Question

我有两个UITapGestureRecognizer：singleTap和doubleTap初始化了两个不同的行为。

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
[singleTap requireGestureRecognizerToFail:doubleTap];
[doubleTap setNumberOfTapsRequired:2];
[imageView addGestureRecognizer:doubleTap];
[imageView addGestureRecognizer:singleTap];

当我在模拟器中运行我的应用程序时，单击可以正确响应但不是双击！当我双击无意义时，我认为iOS剂量识别双击，因为单击的动作没有被调用（由于[singleTap requireGestureRecognizerToFail:doubleTap];），但我不明白为什么它不做动作handleDoubleTap。

Answer 1

我认为问题是UIImageView和UILabel都会覆盖YES属性的默认值userInteractionEnabled，并将其设置为NO。

添加imageView.userInteractionEnabled = YES;然后重试。

Answer 2

以下代码适用于我：

- (void)handleTap:(UIGestureRecognizer*)gr {
    NSLog(@"----------------- tap ----------------");
}
- (void)handleDoubleTap:(UIGestureRecognizer*)gr {
    NSLog(@"================= double tap ============");
}
- (XXXView*)createXXXView {
    XXXView *view = [[[XXXView alloc] init] autorelease];
    view.xxx=...;//irrelevant

    UITapGestureRecognizer *dtr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
    dtr.numberOfTapsRequired = 2;

    UIGestureRecognizer *tr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];

    [tr requireGestureRecognizerToFail:dtr];
    [view addGestureRecognizer:tr];
    [view addGestureRecognizer:dtr];

    return view;
}

使用UITapGestureRecognizer进行双击时出现问题

2 个答案: