如何检测 Swift 2 中的所有触摸 [英] How to detect all touches in Swift 2

问题描述

我正在尝试为我正在使用 Swift 2 开发的应用程序创建超时函数，但在 Swift 2 中，您可以将此代码放在应用程序委托中，它可以工作，但它不会检测到任何键盘按下、按钮按下、文本框按下等:

I'm trying to create a timeout function for an app I'm develop using Swift 2 but in swift 2, you can put this code in the app delegate and it works but it does not detect any keyboard presses, button presses, textfield presses, and etc:

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    super.touchesBegan(touches, withEvent: event);
    let allTouches = event!.allTouches();

    if(allTouches?.count > 0) {
        let phase = (allTouches!.first as UITouch!).phase;
        if(phase == UITouchPhase.Began || phase == UITouchPhase.Ended) {
            //Stuff
            timeoutModel.actionPerformed();
        }
    }
}

在 swift 2 之前，我能够拥有 AppDelegate 子类 UIApplication 并覆盖 sendEvent:像这样:

Before swift 2, I was able to have the AppDelegate subclass UIApplication and override sendEvent: like this:

-(void)sendEvent:(UIEvent *)event
{
    [super sendEvent:event];

    // Only want to reset the timer on a Began touch or an Ended touch, to reduce the number of timer resets.
    NSSet *allTouches = [event allTouches];
    if ([allTouches count] > 0) {
        // allTouches count only ever seems to be 1, so anyObject works here.
        UITouchPhase phase = ((UITouch *)[allTouches anyObject]).phase;
        if (phase == UITouchPhaseBegan || phase == UITouchPhaseEnded)
            [[InactivityModel instance] actionPerformed];
    }
}

上面的代码适用于每次触摸，但 swift 等价物仅在 UIWindow 的层次结构之上不存在视图时才有效?

The code above works for every touch but the swift equivalent only works when a view does not exist above that UIWindow's hierarchy?

有人知道检测应用程序中每一次触摸的方法吗?

Does anyone know a way to detect every touch in the application?

推荐答案

由于我的应用程序中有类似的东西，我只是试图修复它:

As I have something similar in my application, I just tried to fix it:

• 覆盖 UIWindow 中的 sendEvent - 不起作用
• 在委托中覆盖 sendEvent - 不起作用

• override sendEvent in UIWindow - doesn't work
• override sendEvent in delegate - doesn't work

所以唯一的方法是提供自定义的 UIApplication 子类.到目前为止，我的代码(适用于 iOS 9)是:

So the only way is to provide custom UIApplication subclass. My code so far (works on iOS 9) is:

@objc(MyApplication) class MyApplication: UIApplication {

  override func sendEvent(event: UIEvent) {
    //
    // Ignore .Motion and .RemoteControl event
    // simply everything else then .Touches
    //
    if event.type != .Touches {
      super.sendEvent(event)
      return
    }

    //
    // .Touches only
    //
    var restartTimer = true

    if let touches = event.allTouches() {
      //
      // At least one touch in progress?
      // Do not restart auto lock timer, just invalidate it
      //
      for touch in touches.enumerate() {
        if touch.element.phase != .Cancelled && touch.element.phase != .Ended {
          restartTimer = false
          break
        }
      }
    }

    if restartTimer {
      // Touches ended || cancelled, restart auto lock timer
      print("Restart auto lock timer")
    } else {
      // Touch in progress - !ended, !cancelled, just invalidate it
      print("Invalidate auto lock timer")
    }

    super.sendEvent(event)
  }

}

为什么有 @objc(MyApplication).那是因为 Swift 以与 Objective-C 不同的方式处理名称，它只是说 - 我在 Objective-C 中的类名是 MyApplication.

Why there's @objc(MyApplication). That's because Swift mangles names in a different way then Objective-C and it just says - my class name in Objective-C is MyApplication.

要使其正常工作，请打开您的 info.plist 并添加带有 Principal class 键和 MyApplication 值的行(MyApplication 是 MyApplicationcode>@objc(...)，而不是您的 Swift 类名).原始密钥是 NSPrincipalClass.

To make it working, open your info.plist and add row with Principal class key and MyApplication value (MyApplication is what's inside @objc(...), not your Swift class name). Raw key is NSPrincipalClass.

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