title: How to get keyboard height WITHOUT relying on notifications
body: <p>I know how to set up an NSNotification observer to detect when the keyboard shows/hides. From this I can get the height of the keyboard.  But what happens if the device is rotated while the keyboard is still showing? </p>
  
  <p>Is there a way to get the height of the keyboard in this new state? Since the keyboard is still showing a new notification will not be triggered.</p>