title: How to remove focus from UIButton after Timer has expired (tvOS)
body: <p>I'm setting up a simple tvOS application with a menu dock (Stack view containing buttons) at the bottom. After 5 seconds of inactivity I want the dock to hide (move down, out of view) and remove the focus from the currently focused button. The dock should reappear and re-focus on remote  control activity. With the following code the dock hides, but just once, after the app has launched. Any help would be much appreciated!</p>
  
  <pre><code>@IBOutlet weak var menuDock: UIStackView!
  
  var timer = Timer()
  
  func resetTimer() {
      timer = Timer.scheduledTimer(timeInterval: 5.0, target: self, selector: #selector(ViewController.hideDock), userInfo: nil, repeats: true)
      let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(ViewController.showDock))
      self.view.addGestureRecognizer(tapRecognizer)
  }
  
  @objc func hideDock() {
      UIView.animate(withDuration: 0.5, animations: {
          self.menuDock.frame.origin.y += 240
      }, completion: nil)
      timer.invalidate()
  }
  
  @objc func showDock() {
      UIView.animate(withDuration: 0.5, animations: {
          self.menuDock.frame.origin.y -= 240
      }, completion: nil)
      timer = Timer.scheduledTimer(timeInterval: 5, target: self, selector: #selector(ViewController.hideDock), userInfo: nil, repeats: true)
      timer.invalidate()
  }
  </code></pre>