iphone - requireGestureRecognizerToFail不起作用

Question

我正在使用两种不同的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]，也会执行“handleTap”选择器。错误在哪里？

Answer 1

你犯了一个错误!您对setNumberOfTouchesRequired使用了doubleTapGR方法，而不是setNumberOfTapsRequired。这是更正的代码:

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];

最好的祝福 ;)