UITapGestureRecognizer停止触摸已结束 [英] UITapGestureRecognizer Stops touchesEnded

问题描述

我正在尝试制作一个由触摸控制的iPhone应用程序。我还希望在用户双击时激活开机。这是我到目前为止的内容：

I'm trying to make an iPhone app that is controlled by touch. I also want a powerup to be activated when the user double-taps. Here's what I have so far:

UITapGestureRecognizer *powerRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(usePower)];
powerRecognizer.delaysTouchesEnded = NO;
powerRecognizer.numberOfTapsRequired = 2;
powerRecognizer.numberOfTouchesRequired = 1;
[self.view addGestureRecognizer:powerRecognizer];
[powerRecognizer release];

但是问题是，当我双击时，我的 touchesEnded：withEvent ：方法仅触发一次，但是我的 touchesBegan：withEvent：方法仅触发两次。由于 touchesBegan：设置了一个计时器，并且 touchesEnded：使它无效，所以当 touchesEnded：仅触发一次，计时器仍在运行。我该如何解决？

But the problem is, when I double-tap, my touchesEnded:withEvent: method only fires once, but my touchesBegan:withEvent: method fires twice. Since touchesBegan: sets a timer and touchesEnded: invalidates it, then when touchesEnded: only fires once, the timer is still running. How can I fix this?

推荐答案

这是我检测双抽头的解决方案：

Here is my solution for detecting double-taps:

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

UITouch *touch = [touches anyObject];

if([touch tapCount] == 2) {
// do sth   
}

}

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