title: How to change UIAlertController height?
body: <p>I created an UIAlertController</p>
  
  <pre><code>let alertC = UIAlertController(title: "Title", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
  alertC.addTextFieldWithConfigurationHandler(addTextField)
  alertC.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Default, handler: nil))
  alertC.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: okButton))
  presentViewController(alertC, animated: true, completion: nil)
  </code></pre>
  
  <p>But after that I would like to change the UIAlertController height? How can I do this?</p>