Question

我正在尝试检测视图上的双击，但是当双击时，第一次点按会触发TouchesBegan上的操作，因此，在检测到双击之前，始终会首先检测到单击。

如何才能检测到双击？

我无法使用OS 3.x手势，因为我必须使其与旧操作系统版本兼容。

感谢

Answer 1

来自scrollViewSuite示例代码的tapZoom示例的一些摘录：

首先，触摸结束后启动的功能：

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [touches anyObject];

    if ([touch tapCount] == 1) {

            [self performSelector: @selector(handleSingleTap)
                       withObject: nil
                       afterDelay: 0.35]; // after 0.35s we call it a single tap

    } else if([touch tapCount] == 2) {

            [self handleDoubleTap];
    }

}

第二：如果在超时期间发生新的触摸，则拦截消息：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    [NSObject cancelPreviousPerformRequestsWithTarget: self
                                             selector: @selector(handleSingleTap)
                                               object: nil];
}

另见：http://developer.apple.com/iphone/library/documentation/WindowsViews/Conceptual/UIScrollView_pg/ZoomingByTouch/ZoomingByTouch.html#//apple_ref/doc/uid/TP40008179-CH4-SW1

和这里：（scrollView套件） http://developer.apple.com/iphone/library/samplecode/ScrollViewSuite/Introduction/Intro.html

Answer 2

编辑：我错过了你说你不能使用3.x手势的观点，所以这是对你的问题的无效答案，但我离开它以防万一可以使用3.x手势的人可以从中受益

您可以创建两个手势识别器，一个用于单击，一个用于双击：

UITapGestureRecognizer *singleTapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTouchesOne:)];
singleTapGesture.cancelsTouchesInView = NO; 
singleTapGesture.delaysTouchesEnded = NO;
singleTapGesture.numberOfTouchesRequired = 1; // One finger single tap
singleTapGesture.numberOfTapsRequired = 1;
[self.view addGestureRecognizer:singleTapGesture];
[singleTapGesture release];

UITapGestureRecognizer *doubleTapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTouchesTwo:)];
doubleTapGesture.cancelsTouchesInView = NO; 
doubleTapGesture.delaysTouchesEnded = NO;
doubleTapGesture.numberOfTouchesRequired = 1; // One finger double tap
doubleTapGesture.numberOfTapsRequired = 2;
[self.view addGestureRecognizer:doubleTapGesture];
[doubleTapGesture release];

然后，来了一拳：

[singleTapGesture requireGestureRecognizerToFail : doubleTapGesture];

最后一行，只有在双击失败时，您的单击处理程序才能工作。因此，您可以在应用程序中同时进行单击和双击。

Answer 3

你在看tapCount吗？例如：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
         UITouch *touch = [[event allTouches] anyObject];
         if (touch.tapCount == 2) {
                  //double-tap action here
         }
}

iphone - 双击故障安全方式

3 个答案: