如何一天只重复一次 LocalNotification

Question

我创建了一个每天通知用户一次的应用程序。

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，但问题是如果用户一天打开和关闭（终止）应用程序 6 次。

根据应用程序打开时间，用户在第二天总共收到 6 条通知，即如果我在 3 p.m 打开应用程序并关闭它，下一个在 4 p.m 打开应用程序。它将在下午 3 点和次日下午 4 点同时显示通知。

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，它会在每天下午 4 点通知用户吗？

Answer 1

你只需调用 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 2

这是因为每次用户打开应用程序时您都会创建新的本地通知。

并每天重复一次通知，使用 .CalendarUnitDay

试试下面的代码

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 class，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个人资料图像或应用程序的默认配色方案。这些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在应用程序会话中持续存在。这意味着即使用户关闭您的应用程序或重新启动他们的 phone，保存的数据在他们下次打开应用程序时仍然可用

Answer 3

创建本地通知时，只需将 ID 添加到 userInfo 负载即可。然后每次打开应用程序时检查是否有带有该 ID 的通知。如果找到它，则什么也不做，否则创建一个新的时间表。您不需要在用户默认设置中存储任何内容。

-(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 4

很简单。使用此代码

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

并且所有总代码将像...

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)

}

Answer 5

操作系统负责在预定时间发送本地通知。 see UILocalNotification
因此操作系统维护 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()
}

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