title: Problem with rotating custom inputView for UITextView
body: <p>I've written a custom input view that is meant to be used to replace the standard keyboard for a <code>UITextView</code>.  If I assign my custom <code>UIView</code> as my <code>UITextView</code>'s <code>inputView</code>, it works as expected in both portrait and landscape mode.</p>
  
  <p>The problem occurs when I rotate the device - whenever I do this, my custom <code>UIView</code> expands to fill the entire screen, instead of just covering up the keyboard.  I don't have any custom resizing code anywhere for this - I'm literally just assigning the UIView as the UITextView's inputView property and then rotating the device.</p>
  
  <p>How do I get my custom keyboard view to only occupy the space taken up by the normal keyboard when I rotate the device?</p>