title: iPhone keyboard, Done button and resignFirstResponder
body: <p>This is probably a dumb question, but I can't find the answer in the docs. Did the "Done" button on the pop-up keyboard always cause the keyboard to disappear? I see a lot of code around the web like this:</p>
  
  <pre><code>- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
      [theTextField resignFirstResponder];
      return YES;
  }
  </code></pre>
  
  <p>When I press the "Done" button, the keyboard pops down and the <code>UITextField</code> resigns first responder.</p>
  
  <p>I'm presuming that pressing the "Done" button didn't used to cause a <code>UITextField</code> to <code>resignFirstResponder</code>, but that behavior changed at some time.</p>
  
  <p>I'm debugging on OS 3.0 - 3.1.3</p>