timerFubar.swift

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(InformationController.counter), userInfo: nil, repeats: true)
    
    questionArea.textColor = .white
    
    let infoLayer = self.view.layer
    infoLayer.cornerRadius = 20.0
    infoLayer.borderWidth = 10.0
    infoLayer.borderColor = UIColor.white.cgColor

    let card = randomize(deck: selectedDeck)
    
    questionArea.text = card.name
    
    
    motionManager.gyroUpdateInterval = 0.1
    motionManager.startGyroUpdates(to: OperationQueue.current!) { (data, error) in
      if let myData = data {
        let coordinates = myData.rotationRate.y
        switch coordinates {
        case let y where y < -5:
          print("up")
          print(coordinates)
          self.motionManager.stopGyroUpdates()
//          self.timer.invalidate()
          self.performSegue(withIdentifier: "Orange", sender: nil)
          self.selectedCards.append(Card(name: card.name, outcome: .wrong, alpha: 0))
        case let y where y > 5:
          print("down")
          print(coordinates)
          self.motionManager.stopGyroUpdates()
          self.performSegue(withIdentifier: "Green", sender: nil)
//          self.timer.invalidate()
          self.selectedCards.append(Card(name: card.name, outcome: .right, alpha: 0))
        default:
          print(coordinates)
        }
      }
    }
   
  }
  
  
  func counter() {
    seconds -= 1
    timerCountdown.text = String(seconds)
    
    if (seconds == 0) {
      timer.invalidate()
      self.motionManager.stopGyroUpdates()
      self.performSegue(withIdentifier: "tempoFinal", sender: nil)
    }
  }