title: How to get notified when the iPad keyboard disappears?
body: <p>On the iPad, the user can press a "keyboard away" button that lets it go away. This button won't trigger the didEndOnExit event we're used to for resigning the first responder status of the responsible text input view.</p>
  
  <p>How can I hook up to this even when the user presses the keyboard away button? It's an universal binary, btw.</p>