touchesEnded:withEvent:如何解决延迟，然后再触发 [英] touchesEnded:withEvent: How to work around the delay before it fires

问题描述

在iPhone OS上，除非有阻力，否则-touchesEnded:withEvent:在您离开手指时会快速触发.如果-touchesMoved:withEvent:已触发，那么在您获得touchesEnded:withEvent:之前大约有0.6秒的延迟.

On iPhone OS, -touchesEnded:withEvent: fires quickly when you left a finger, unless there was a drag. If -touchesMoved:withEvent: has fired, then there is about a 0.6 second delay before you get touchesEnded:withEvent:.

我在一个新项目中对此进行了验证，没有scrollView，没有多点触摸.

I verified this in a new project, no scrollView, no multi-touch.

我希望用户拖动一个对象，然后只要抬起手指就可以触发方法. 0.6秒的延迟是不可接受的.

I want the user to drag an object around, and then have a method fire as soon as he lifts a finger. The 0.6 second delay is unacceptable.

有什么想法要解决吗?

我在测试项目中编写的唯一代码是:

The only code I have written in the test project is this:

   @implementation MyView

// startTime is an ivar
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    startTime = [NSDate timeIntervalSinceReferenceDate];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"%f", [NSDate timeIntervalSinceReferenceDate] - startTime);
}

推荐答案

发现了问题:Magic Trackpad.当您运行模拟器时，Magic Trackpad会在确定您结束触摸之前添加一个延迟.

Found the problem: Magic Trackpad. When you run the Simulator, Magic Trackpad adds a delay before it decides that you have ended a touch.

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