ios - 通过触摸应用程序图标启动应用程序时，应用程序图标角标(Badge)编号不会更改为零

Question

我正在开发本地通知代码。我能够根据触发的通知数量显示角标(Badge)编号，并且当用户打开通知时我能够将所有图标设置为 0，但是如果用户启动应用程序，角标(Badge)未设置为 0。它仅在用户打开通知时设置为 0。我已阅读多个答案和多篇文章，但找不到解决方案。为了注册我的本地通知，我有以下代码 -

func addItem(item: TodoItem)
    {
        // persist a representation of this todo item in NSUserDefaults

        var todoDictionary = NSUserDefaults.standardUserDefaults().dictionaryForKey(ITEMS_KEY) ?? Dictionary()// if todoItems hasn't been set in user defaults, initialize todoDictionary to an empty dictionary using nil-coalescing operator (??)

        todoDictionary[item.UUID] = ["deadline" : item.deadline, "title" : item.title, "UUID" : item.UUID]// store NSData representation of todo item in dictionary with UUID as key

        NSUserDefaults.standardUserDefaults().setObject(todoDictionary, forKey: ITEMS_KEY)

        let notification  = UILocalNotification()

        notification.alertBody = "Todo Item \"\(item.title)\" Is Overdue" // text that will be displayed in the notification
        notification.alertAction = "open" // text that is displayed after "slide to..." on the lock screen - defaults to "slide to view"
        notification.fireDate = item.deadline // todo item due date (when notification will be fired)
        notification.soundName = UILocalNotificationDefaultSoundName // play default sound
        notification.userInfo = ["title": item.title, "UUID": item.UUID] // assign a unique identifier to the notification so that we can retrieve it later
       let nextbadge = (UIApplication.sharedApplication().scheduledLocalNotifications?.count)! + 1
        notification.applicationIconBadgeNumber = nextbadge//here I provide an incremental badge number to my local notification.
        UIApplication.sharedApplication().scheduleLocalNotification(notification)


    }

在我的应用程序类中

func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification)
    {
        NSNotificationCenter.defaultCenter().postNotificationName("ToDoListShouldtRefresh", object: self)

         application.applicationIconBadgeNumber = 0;


    }

现在在 objective-c 中，我通常这样做是为了在应用程序启动时清除角标(Badge) -

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.

    // Handle launching from a notification
    UILocalNotification *locationNotification = [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
    if (locationNotification) {
        // Set icon badge number to zero
        application.applicationIconBadgeNumber = 0;
    }

    return YES;
}

我试过类似的东西，但徒劳无功 -

 func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool
    {


        application.registerUserNotificationSettings(UIUserNotificationSettings (forTypes:[.Alert, .Badge, .Sound], categories: nil))
        if let notification:UILocalNotification = launchOptions?[UIApplicationLaunchOptionsLocalNotificationKey] as? UILocalNotification
        {

            application.applicationIconBadgeNumber = 0
        }
        return true





    }

那么现在如何在 SWIFT 中做到这一点？

Answer 1

UIApplicationLaunchOptionsLocalNotificationKey 仅当用户通过通知打开应用时才会设置。

因此，如果您需要在所有情况下启动后立即将 applicationIconBadgeNumber 设置为 0，则无需检查 UIApplicationLaunchOptionsLocalNotificationKey:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool
{
    application.registerUserNotificationSettings(UIUserNotificationSettings (forTypes:[.Alert, .Badge, .Sound], categories: nil))
    application.applicationIconBadgeNumber = 0
    return true

}