title: when i add a sound file into xcode and played it using uilocalization, it won't work.
body: <p>I dragged a "alarm.caf" file into my project,and used </p>
  
  <pre><code>notification.soundName = @"alarm.caf";
  </code></pre>
  
  <p>to make it play.</p>
  
  <p>However, it won't make any sounds in the simulator. At the same time, I tried another app (which has the same function), and all goes well. I don't understand at all. I also tried .m4a but it can't figure the problem.
  anyone knows about it?</p>
  
  <p>By the way, i want to know that whether <strong><em>uilocalnotification</em></strong> can be showed in a pop-up style?</p>