title: UIWindow convertRect: fromView:
body: <p>Can someone tell me how this works on iPad?  Is it different from how it works on iPhone?</p>
  
  <pre><code>CGRect textFieldRect = [self.view.window convertRect:textField.bounds fromView:textField];
  </code></pre>
  
  <p>It get weird heights from textFieldRect.size.height.  All seems normal until about the middle of the view.  The size.height shrinks to a very low number, and bounces back and forth as my cursor goes down the view.</p>