iphone - 双击故障安全方式 [英] iphone - double tap fail safe way

问题描述

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。

I am trying to detect double taps on a view, but when the double tap comes, the first tap triggers an action on TouchesBegan, so, before detecting a double tap a single tap is always detected first.

如何才能检测到双击？

我不能使用OS 3.x手势，因为我必须使它与旧操作系统版本兼容。

I cannot use OS 3.x gestures, because I have to make it compatible with old OS versions.

谢谢

推荐答案

scrollViewSuite示例代码的tapZoom示例中的一些摘录：

Some excerpts from the tapZoom example of the scrollViewSuite sample code:

首先，触摸结束后启动的功能：

First, the function to kick off things once the touch ended:

- (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：拦截消息超时期间发生新触摸：

Second: intercept the message if a new touch occurs during timeout:

- (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

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

and here: (scrollView suite) http://developer.apple.com/iphone/library/samplecode/ScrollViewSuite/Introduction/Intro.html

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