Question

我使用两个不同的TapGestureRecognizer来处理屏幕上的单击和双击。这是代码：

UITapGestureRecognizer *tapGR =[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTap:)];
    [tapGR setDelegate:self];
    [tapGR setNumberOfTapsRequired:1];
    [self addGestureRecognizer:tapGR];


    UITapGestureRecognizer *doubleTapGR = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleDoubleTap:)];
    [doubleTapGR setNumberOfTouchesRequired:2];
    [self addGestureRecognizer:doubleTapGR];

    [tapGR requireGestureRecognizerToFail : doubleTapGR];

    [tapGR release];
    [doubleTapGR release];

即使我指定了[tapGR requireGestureRecognizerToFail：doubleTapGR]＆＃34; handleTap＆＃34;执行选择器。错误在哪里？

Answer 1

你犯了一个错误！您使用setNumberOfTouchesRequired方法doubleTapGR而非使用setNumberOfTapsRequired。这是更正后的代码：

UITapGestureRecognizer *tapGR =[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTap:)];
[tapGR setDelegate:self];
[tapGR setNumberOfTapsRequired:1];
[self addGestureRecognizer:tapGR];


UITapGestureRecognizer *doubleTapGR = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleDoubleTap:)];
[doubleTapGR setNumberOfTapsRequired:2];
[self addGestureRecognizer:doubleTapGR];

[tapGR requireGestureRecognizerToFail : doubleTapGR];

[tapGR release];
[doubleTapGR release];

最好的问候;）

Answer 2

我想你可能已经省略了：

[doubleTapGR setDelegate:self];

Answer 3

我发现我真的很傻：）

我写道：

[doubleTapGR setNumberOfTouchesRequired:2];

而不是：

[doubleTapGR setNumberOfTapsRequired:2];

随意删除此答案。对不起StackOverflow。

requireGestureRecognizerToFail不起作用

3 个答案: