在Objective-C中实现单击和双击

Question

我像下面的代码一样为一个视图添加了单击和双击功能：

-(void)awakeFromNib{
    [self setUserInteractionEnabled:YES];
    //
    UITapGestureRecognizer *doubleTapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTapGesture:)];
    doubleTapGesture.numberOfTapsRequired = 2;
    [self addGestureRecognizer:doubleTapGesture];

    UITapGestureRecognizer *singleTapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTapGesture:)];
    singleTapGesture.numberOfTapsRequired = 1;
    [self addGestureRecognizer:singleTapGesture];
}

-(void)handleSingleTapGesture:(UITapGestureRecognizer *)singleTapGesture{
    [[self delegate] singleTapOnView];
}

-(void)handleDoubleTapGesture:(UITapGestureRecognizer *)doubleTapGesture{
    [[self delegate] doubleTapOnView];
}

当双击时单击事件也会触发。如何在双击时禁用单击事件？谢谢！

- Jack

Answer 1

告诉单击手势识别器在触发前需要等待双击手势识别器失败：

[singleTapGesture requireGestureRecognizerToFail:doubleTapGesture];

（这实际上是UIGestureRecognizer文档中此方法的典型示例。）

- Tim