Question

我创建了一个应用程序，其中应用程序在一天内通知用户一次。

为此，我使用了以下代码

 func application(application: UIApplication, didRegisterUserNotificationSettings notificationSettings: UIUserNotificationSettings) {

    scheduleNoticaiftion()
}

// Schedule the Notifications with repeat
func scheduleNoticaiftion() {
    //UIApplication.sharedApplication().cancelAllLocalNotifications()

    // Schedule the notification ********************************************

        let notification = UILocalNotification()
        notification.alertBody = "Hey! Upload your latest photos"
        notification.soundName = UILocalNotificationDefaultSoundName
        notification.fireDate = NSDate()
       // notification.category = categoryID
        notification.repeatInterval = NSCalendarUnit.CalendarUnitDay

        UIApplication.sharedApplication().scheduleLocalNotification(notification)

}

上面的代码工作正常，但问题是用户是否在一天内打开并关闭（终止）应用程序6次。

用户在第二天根据应用程序开放时间获得总共6个通知，即如果我在下午3点打开应用程序并关闭它并在下午4点打开下一个应用程序。它将同时在第二天下午3点和下午4点显示通知。

问题：如何在24小时内只发送一个通知？即如果用户在下午4点安装我的应用程序，它将每天下午4点通知用户？

Answer 1

这是因为每次用户打开应用时都会创建新的本地通知。

并每天重复一次通知使用.CalendarUnitDay

尝试以下代码

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.

        if(!NSUserDefaults.standardUserDefaults() .boolForKey("isNotificationScheduled")){
            scheduleNoticaiftion()
        }
        return true
    }

    // Schedule the Notifications with repeat
    func scheduleNoticaiftion() {
        //UIApplication.sharedApplication().cancelAllLocalNotifications()

        // Schedule the notification ********************************************

        let notification = UILocalNotification()
        notification.alertBody = "Hey! Upload your latest photos"
        notification.soundName = UILocalNotificationDefaultSoundName
        notification.fireDate = NSDate()
        // notification.category = categoryID
        notification.repeatInterval = NSCalendarUnit.CalendarUnitDay

        UIApplication.sharedApplication().scheduleLocalNotification(notification)

        NSUserDefaults .standardUserDefaults() .setBool(true, forKey: "isNotificationScheduled")
        NSUserDefaults .standardUserDefaults() .synchronize()
    }

NSUserDefaults类，您可以保存与应用程序或用户数据相关的设置和属性。例如，您可以保存用户设置的配置文件图像或应用程序的默认颜色方案。对象将保存在所谓的iOS“默认系统”中。 iOS默认系统在应用程序的所有代码中都可用，保存到默认系统的任何数据都将通过应用程序会话保留。这意味着即使用户关闭您的应用程序或重新启动他们的手机，下次打开应用程序时保存的数据仍然可用

Answer 2

创建本地通知时，只需在userInfo有效内容中添加ID即可。然后，每次打开应用程序时，请检查是否有包含该ID的通知。如果您找到它然后什么都不做，否则创建一个新的计划。您不需要在用户默认值中存储任何内容。

-(void) scheduleNotification {
    UIApplication *app = [UIApplication sharedApplication];

    NSArray *notifications = [app scheduledLocalNotifications];
    for (UILocalNotification* notification in notifications)
    {
        if ([[notification.userInfo objectForKey:@"ID"] isEqualToString:@"MY_NOTIFICATION"])return;
    }

    UILocalNotification *notification = [[UILocalNotification alloc] init];
    notification.fireDate = [NSDate date];
    notification.alertBody = @"Hey! Upload your latest photos";
    notification.userInfo = @{@"ID":@"MY_NOTIFICATION"};
    notification.repeatInterval = NSCalendarUnitDay;
    notification.soundName = UILocalNotificationDefaultSoundName;

    [app scheduleLocalNotification: notification];

}

Answer 3

操作系统负责在预定时间发送本地通知。 see UILocalNotification
因此操作系统会保持scheduledLocalNotifications计数。

func scheduleNotification() {

    if UIApplication.sharedApplication().scheduledLocalNotifications.count == 0 {

        let notification = UILocalNotification()
        notification.alertBody = "Hey! Update your counter ;)"
        notification.soundName = UILocalNotificationDefaultSoundName
        notification.fireDate = NSDate()
        notification.repeatInterval = NSCalendarUnit.CalendarUnitDay

        UIApplication.sharedApplication().scheduleLocalNotification(notification)
    }
}


func application(application: UIApplication, didRegisterUserNotificationSettings notificationSettings: UIUserNotificationSettings) {
    scheduleNotification()
}

Answer 4

你必须只召唤scheduleNoticaiftion()一次，所以

试试这个

NSUserDefaults *Check = [NSUserDefaults standardUserDefaults];
if ([Check boolForKey:@"FirstTime"] == NO) {
    [Check setBool:YES forKey:@"FirstTime"];
    [Check synchronize];
    [self scheduleNoticaiftion];
}

Answer 5

很容易。使用此代码

notification.repeatInterval = NSCalendarUnit.CalendarUnitDay
or,
notification.repeatInterval = NSCalendarUnit.CalendarUnitWeekday

并且所有总代码都会像......

func application(application: UIApplication, didRegisterUserNotificationSettings notificationSettings: UIUserNotificationSettings) 
{
 if( NSUserDefaults.standardUserDefaults().valueForKey("localNotification") == nil )
 {
 scheduleNoticaiftion()
 }
}

// Schedule the Notifications with repeat
func scheduleNoticaiftion() {
//UIApplication.sharedApplication().cancelAllLocalNotifications()

// Schedule the notification********************************************

    let notification = UILocalNotification()
    notification.alertBody = "Hey! Upload your latest photos"
    notification.soundName = UILocalNotificationDefaultSoundName
    notification.fireDate = NSDate()
   // notification.category = categoryID
    notification.repeatInterval = NSCalendarUnit.CalendarUnitDay

    NSUserDefaults.standardUserDefaults().setValue("registered", forKey: "localNotification")
UIApplication.sharedApplication().scheduleLocalNotification(notification)

}

如何仅在一天内重复一次LocalNotification

5 个答案: