title: iAd ADBannerView detect unloading
body: <p>If you add an ADBannerView you can detect when it loads an AD from its delegate function:</p>
  
  <pre><code>- (void)bannerViewDidLoadAd:(ADBannerView *)banner {
  </code></pre>
  
  <p>This can be helpful if you have views below the banner that you need to move or resize when the banner loads. </p>
  
  <p>I coudn't find any way to detect when the banner is disappearing  to move back again all the views in place.</p>
  
  <p>The delegate has only these functions:</p>
  
  <p>Detecting When Advertisements Are Loaded</p>
  
  <pre><code>– bannerViewWillLoadAd:
  – bannerViewDidLoadAd:
  </code></pre>
  
  <p>Detecting When a User Interacts With an Advertisement</p>
  
  <pre><code>– bannerViewActionShouldBegin:willLeaveApplication:
  – bannerViewActionDidFinish:
  </code></pre>
  
  <p>Detecting Errors</p>
  
  <pre><code>– bannerView:didFailToReceiveAdWithError:
  </code></pre>
  
  <p>Nothings seems to get triggered when the banner unloads.</p>
  
  <p>Any way to detect the banner unload or any workarounds?
  Thanks!</p>