title: iAd does not rotate
body: <p>I have a Universal app with 1 iAd. Now I need to support both orientations..</p>
  
  <p>I use the following code;</p>
  
  <pre><code>- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
  
      if ( &amp;ADBannerContentSizeIdentifierPortrait != NULL) {
          // NEWER
          if (UIInterfaceOrientationIsLandscape(toInterfaceOrientation))
              adView_.currentContentSizeIdentifier = ADBannerContentSizeIdentifierLandscape;
          else
              adView_.currentContentSizeIdentifier = ADBannerContentSizeIdentifierPortrait;
      } else {
          // OLDER
          if (UIInterfaceOrientationIsLandscape(toInterfaceOrientation))
              adView_.currentContentSizeIdentifier = ADBannerContentSizeIdentifier480x32;
          else
              adView_.currentContentSizeIdentifier = ADBannerContentSizeIdentifier320x50;
      }
  }
  </code></pre>
  
  <p>But as soon as I rotate to portrait, my app crashes with following error;</p>
  
  <blockquote>
    <p>Terminating app due to uncaught exception
    'NSInternalInconsistencyException', reason: 'currentContentSize must
    be one of the requiredContentSizes; 'ADBannerContentSizeLandscape' is
    not in {(
        ADBannerContentSizePortrait )}'</p>
  </blockquote>
  
  <p>I am testing on IOS4.3 simulator.</p>
  
  <p>Please help me. Thank you.</p>