【APNs】Scheduling the Delivery of Local Notifications

- (void)scheduleAlarmForDate:(NSDate*)theDate
  {
      UIApplication* app = [UIApplication sharedApplication];
      NSArray*    oldNotifications = [app scheduledLocalNotifications];
      // Clear out the old notification before scheduling a new one.
      if ([oldNotifications count] > 0)
          [app cancelAllLocalNotifications];
      // Create a new notification.
      UILocalNotification* alarm = [[UILocalNotification alloc] init];
      if (alarm)
      {
          alarm.fireDate = theDate;
          alarm.timeZone = [NSTimeZone defaultTimeZone];
          alarm.repeatInterval = 0;
          alarm.soundName = @"alarmsound.caf";
          alarm.alertBody = @"Time to wake up!";
          [app scheduleLocalNotification:alarm];
      }
}

Schedule and Post Local Notification