在后台Swift中解析数据

Question

我对swift非常陌生，我需要一些帮助。我想用每日背景提取更新AppDelegate中的Parse。奇怪的是这在模拟器上有效但在我的实际设备上不起作用。当我再次打开应用程序时，通知会触发。任何帮助，将不胜感激。

func application(application: UIApplication,
                 performFetchWithCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) {

    // Do something
    var rankCout = 1
    var query = PFQuery(className: "Person")
    query.orderByDescending("Score")
    query.findObjectsInBackgroundWithBlock{
        (objects: [AnyObject]!, error:NSError!)-> Void in
        if error == nil
        {


            for object in objects
            {

                if ((object["Name"]) as NSString ==  (NSUserDefaults.standardUserDefaults().objectForKey("USERNAME")) as NSString)
                {

                    var notification:UILocalNotification = UILocalNotification()
                    notification.alertBody = "TEST"

                    println("PUSH")
                    UIApplication.sharedApplication().scheduleLocalNotification(notification)
                }
            }

        }
    }
}