iOS 如何使用iTunes里面的音乐作为本地推送的声音 在线等 急！！！

RT 求大神的解答
步骤应该先从iTunes里面导出音乐到APP里面
然后使用的是本地推送
网易云音乐里面的音乐闹钟就实现了这个需求

我现在做到了把iTunes里面的音乐导入到APP中 现在就是不知道如何设置这个音乐为本地推送的声音

http://stackoverflow.com/questions/6894026/how-to-set-sound-local-notification-from-song-in-itunes

• (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
  {
  if (indexPath.section == 0) {
  MPMediaPickerController *picker = [[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeMusic];

  picker.delegate = self;
  picker.allowsPickingMultipleItems = NO;
  picker.prompt = NSLocalizedString (@"Select any song from the list", @"Prompt to user to choose some songs to play");
  
  //[self presentModalViewController: picker animated: YES];
  [self.navigationController pushViewController:picker animated:YES];
  
  NSLog(@"gsudifghukdsf");
  [picker release];
  

  }
  }

• (void) mediaPicker: (MPMediaPickerController *) mediaPicker didPickMediaItems: (MPMediaItemCollection *) mediaItemCollection
  {
  [self.navigationController popToRootViewControllerAnimated:YES];
  //[self dismissModalViewControllerAnimated: YES];
  NSLog(@"%@",mediaItemCollection);

  UILocalNotification *local = [[UILocalNotification alloc] init];
  //selectedSongCollection=mediaItemCollection;

}

• (void) mediaPickerDidCancel: (MPMediaPickerController *) mediaPicker {
  [self.navigationController popToRootViewControllerAnimated:YES]; //[self dismissModalViewControllerAnimated: YES]; }

求解答！！！！！！！！！！！！