title: move up UIAlertController style Alert with UITextView when keyboard is present
body: <p>i have an AlertController with UITextView.</p>
  
  <p>when UITexView become first responder the alter doesn't move up with the keyboard.</p>
  
  <p>this is my code:</p>
  
  <pre><code>@IBAction func showAlert(sender: AnyObject) {
  
      let alertController = UIAlertController(title: "Hello, I'm alert! \n\n\n\n\n\n\n", message: "", preferredStyle: .alert)
  
      let rect        =   CGRect(x: 15, y: 15, width: 240, height: 150)//CGRectMake(15, 50, 240, 150.0)
      let textView    = UITextView(frame: rect)
  
      textView.font               = UIFont(name: "Helvetica", size: 15)
      textView.textColor          = UIColor.lightGray
      textView.backgroundColor    = UIColor.white
      textView.layer.borderColor  = UIColor.lightGray.cgColor
      textView.layer.borderWidth  = 1.0
      textView.text               = "Enter message here"
      textView.delegate           = self
  
      alertController.view.addSubview(textView)
  
      let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
      let action = UIAlertAction(title: "Ok", style: .default, handler: { action in
  
          let msg = (textView.textColor == UIColor.lightGray) ? "" : textView.text
  
          print(msg!)
  
      })
      alertController.addAction(cancel)
      alertController.addAction(action)
  
  
      self.present(alertController, animated: true, completion: {
  
          textView.becomeFirstResponder()
      })
  }
  </code></pre>
  
  <p>and this is my result:</p>
  
  <p><a href="https://i.stack.imgur.com/kCUcZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kCUcZ.png" alt="enter image description here"></a>
  there is a solution?</p>
  
  <p>thanks in advance</p>