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I have a specific UIViewController for which I want to block the idleTimer processing done by iOS. I know that I can set: UIApplication.shared.isIdleTimerDisabled = true However, I want to be able to set a timer to re-enable the normal system idle timer processing after a fixed amount of time, thus I can keep the screen on for a minimum amount of time. The nature of the app is such that you would have a view open and use it for reference/reading for a longish time.

The KEY POINT is that I want the timer to restart every time the user touches the screen or interacts with the device. So I need to be able to detect if the user does anything so I can rest the time.

I tried to override the touchesEnded method in the controller, however testing showed that the method is never called. Any ideas would be welcomed (in swift 3:)

zkon
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  • Do you need to detect touch of the particular `UIView` or `detect `touch` of the screen when app using `Background App Referesh` ? – Rajamohan S Jul 02 '17 at 13:36
  • I need to detect touch for screen only, not background refresh. I also need it done in code. I want to detect for the whole controller's view (and by extension the sub-views), not just a specific view. – zkon Jul 02 '17 at 22:11

2 Answers2

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Swift 3.0 :-

Need to detect touch of the particular view without IBOutlet, then select that particular UIView then goto Attributes Inspector -> View -> tag and set Integer as tag whatever need.

enter image description here

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

    let touch = touches.first

    let tag = touch?.view?.tag
    if tag == 1{
        //Do More....
    }else{
    //......
    }

}

If you need to check with IBOutlet, then do like as below.

Here, @IBOutlet var diamondView: UIView!

if touch?.view == self.diamondView{

    //Do More....
}else{
//......
}

Update : Scroll View

If you need to detect touch of the scroll view then use UITapGestureRecognizer. By story board drag and drop to to of the UIViewController and set delegate and gestureRecognizers for scroll view to UITapGestureRecognizer. After that just create action for UITapGestureRecognizer like as below screenshot. enter image description here

Adding UITapGesture Programmatically :-

Also below code works fine without do like above screenshot.

@IBOutlet var scrollView: UIScrollView!

override func viewDidLoad() {
    super.viewDidLoad()

    let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.actionTapOnScrollView(sender:)))
    self.scrollView.addGestureRecognizer(tapGesture)


}

@objc private func actionTapOnScrollView(sender:UITapGestureRecognizer){
    print("user Touched")
}
Rajamohan S
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  • I've tried to override `touchesBegan` and `touchesEnded` but they are not being called for he controller. The main view inside the controllers view is a `UIScrollView` that dominates most of the window. – zkon Jul 02 '17 at 22:17
  • Thanks for your answer @RAJAMOHAN-S. I was hoping for something more lower level (that didn't involve sub-classing). My answer to this questions tells you how I did end up doing it. – zkon Jul 03 '17 at 07:23
  • @zkon , Thanks, if you don't hesitate send me the code snippet through skype on my profile. I will send back with proper solution. – Rajamohan S Jul 03 '17 at 07:33
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In the end I solved this by doing a composite solution to what @RAJAMOHAN-S suggested.

  1. I added a UIGestureRecognizer to the controllers view. Using this I could pick up if there was a tap anywhere in the view and thus reset my timer.

    view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(viewTappedHandler)))

    The viewTappedHandler method set the timer I needed.

  2. I made my UIController a delegate for the UIScrollView by adding the UIScrollViewDelegate protocol to the controller's class declaration.

    Then I implemented: scrollViewWillBeginDragging(_ scrollView: UIScrollView) and again set the time. This picks up movements in the scroll view that the tap gesture doesn't pick up.

  3. Finally, because my scroll view contained other views that can open the keyboard, I also needed to register for keyboard notifications and again set the timer for each occurrence.

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardDidShow), name: .UIKeyboardDidShow, object: nil) NotificationCenter.default.addObserver(self, selector: #selector(keyboardDidHide), name: .UIKeyboardDidHide, object: nil) NotificationCenter.default.addObserver(self, selector: #selector(keyboardDidChange), name: .UIKeyboardDidChangeFrame, object: nil)

I'm not completely happy with this as tapping on the keyboard keys is not detected, but I'm not expecting this to be a real issue for this app.

PS I also removed the observers on the keyboard and clear the timer on deinit.

zkon
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