title: UIAlertController addAction not working
body: <p>So the UIAlertController is displaying the alert on the screen correctly, but in the xCode simulator pressing ok does nothing and it doesn't leave the alert. <a href="http://i.stack.imgur.com/5I0DL.png" rel="nofollow">alert view image</a></p>
  
  <pre><code>    func displayAlertMessage(userMessage:String) {
  
      let myAlert = UIAlertController(title: "Alert", message: userMessage, preferredStyle: UIAlertControllerStyle.Alert);
  
      let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil);
  
      myAlert.addAction(okAction);
  
      self.presentViewController(myAlert, animated: true, completion: nil);
  
  }
  </code></pre>