title: UILocalNotification - Need to vibrate for a longer duration during the alert / notification
body: <p><strong>Overview</strong></p>
  
  <ul>
  <li>In my iOS project, I am using UILocalNotification, </li>
  <li>when a notification is fired, a custom sound is played. </li>
  <li>the custom sound plays for about 20 seconds, </li>
  <li>the phone vibrates only once at the start</li>
  </ul>
  
  <p><strong>What I want to do:</strong></p>
  
  <ul>
  <li>Presently the phone vibrates only once at the start. I want it to vibrate repeatedly for 20 seconds just like in Apple's alarm / Timer app before the user pressed on the action button ?</li>
  </ul>
  
  <p><strong>Question</strong></p>
  
  <ul>
  <li>During the alert is it possible to make the phone to vibrate for the 20 seconds before the user can attends to the notification or clicks on the action button ?</li>
  </ul>
  
  <p><strong>Problem</strong></p>
  
  <ul>
  <li>Since my app doesn't have any control till the user presses on the action button I am not sure how I can make it vibrate </li>
  <li>The app might be closed when the notification is pops </li>
  </ul>
  
  <p>Is there a way to do this ?</p>