title: idleTimerDisabled doesn't work (Keep iPad screen from going to sleep)
body: <p>I have to download a very large file on the iPad. (iOS5, iOS6)</p>
  
  <p>To keep the iPad screen from going in to sleep I use:</p>
  
  <pre><code>[UIApplication sharedApplication].idleTimerDisabled = YES;
  </code></pre>
  
  <p>But it doesn't work.</p>
  
  <p>Can someone help me?</p>