iOS：当iPad处于待机模式时（当用户快速按下电源按钮时），是否可以在应用程序的后台启动更新？

Question

我有一段代码可以让我在特定时间更新我的应用程序：

MainViewController.m：

NSDate *now = [NSDate date];
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:now];
    [components setHour:14];
    [components setMinute:5];
    [components setSecond:0];
    NSDate *nextAlarm = [calendar dateFromComponents:components];
    if ([nextAlarm timeIntervalSinceNow] < 0)
    {
        nextAlarm = [nextAlarm dateByAddingTimeInterval:60*60*24];
    }
    UILocalNotification *localNotification = [[UILocalNotification alloc] init];
    [localNotification setRepeatInterval: NSCalendarUnitDay];
    [localNotification setFireDate:nextAlarm];
    [localNotification setAlertBody:@"It's been one day"];
    [localNotification setValue:nextAlarm forKey:@"fireDate"];

    UIApplication *app = [UIApplication sharedApplication];
    [app scheduleLocalNotification:localNotification];  

AppDelegate.m

  NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSDate *synchroDate = notification.fireDate;

    NSDate *currentDate= [NSDate date];
    NSLog(@"difference : %f", [synchroDate timeIntervalSinceDate:currentDate]);

    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSInteger comps = (NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear | NSCalendarUnitHour | NSCalendarUnitMinute);

    NSDateComponents *date1Components = [calendar components:comps
                                                    fromDate: currentDate];
    NSDateComponents *date2Components = [calendar components:comps
                                                    fromDate: synchroDate];

    currentDate = [calendar dateFromComponents:date1Components];
    synchroDate = [calendar dateFromComponents:date2Components];

    BOOL result = [currentDate isEqual:synchroDate];

    if (result)
    {
        [self autoSynchro];
    }

我的问题是我希望在我的设备关闭时启动该代码。我可以看到通知在ipad主屏幕上很好地启动了，但功能没有启动...

可能我必须使用它：

UIApplicationState state = [[UIApplication sharedApplication] applicationState];
if (state == UIApplicationStateInactive)
{
   //Do checking here.
}

但如果它处于待机模式，如何启动它？ 有什么想法吗？