title: Problems updating countdown timer in UIAlertController
body: <p>I'm trying to update a countdown timer in the message part of a UIAlertController. I've tried lots of answers suggested on here but with no joy.
  I have a simple ViewController to try out what I'm trying to achieve.</p>
  
  <pre><code>class ViewController: UIViewController {
  
  var counter:Int = 5
  var timer: NSTimer?
  var label = ""
  var message = "in "
  
  override func viewDidLoad() {
      super.viewDidLoad()
  }
  
  override func viewDidAppear(animated: Bool) {
      showAlert()
  }
  
  func showAlert(){
      let alertController = UIAlertController(title: "Try again ", message: countDownString(), preferredStyle: .Alert)
  
      presentViewController(alertController, animated: true){
          self.timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: #selector(self.decrease), userInfo: nil, repeats: true)
      }
  }
  
  func decrease()
  {
      var minutes: Int
      var seconds: Int
      if(counter &gt; 0) {
          self.counter -= 1
          print(counter)  // Correct value in console
          minutes = (counter % 3600) / 60
          seconds = (counter % 3600) % 60
          label = String(format: "%02d:%02d", minutes, seconds)
          print(label)  // Correct value in console
      }
      else{
          dismissViewControllerAnimated(true, completion: nil)
          timer!.invalidate()
      }
  }
  
  func alertMessage() -&gt; String {
      print(message+"\(self.label)")
      return(message+"\(self.label)")
  }
  
  func countDownString() -&gt; String {
      print("\(counter) seconds")
      return "\(counter) seconds"
  }
  </code></pre>
  
  <p>}</p>
  
  <p>Counter and Label both show the correct values in the console but I'm unable to get them to display the values in the UIAlertController.
  screenshots show the output i'm getting in the view controller.</p>
  
  <p>Where am I going wrong?</p>
  
  <p><a href="https://i.stack.imgur.com/JHb0b.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JHb0b.png" alt="alertMessage screenshot"></a>
  <a href="https://i.stack.imgur.com/nvSPv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nvSPv.png" alt="countDownString screenshot"></a></p>
  
  <p>I'm using Xcode 7.3 and Swift 2.2</p>