ios - 为什么我收到通知后无法移除角标(Badge)？

Question

我正在尝试使用 Firebase 云消息传递实现推送通知，我通过 firebase 控制台发送消息。在 Firebase 控制台中撰写消息时，我将角标(Badge)编号设置为 1，如下图所示

在那之后，我的应用程序在主屏幕上的图标总是有数字“1”的角标(Badge)，即使我尝试卸载并重新安装它，数字“1”的角标(Badge)仍然存在。

但它只发生在我的 iPhone 上，如果我在其他手机上安装它，角标(Badge)将不会显示

我在 App delegate 中使用这段代码来触发推送通知

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, MessagingDelegate, UNUserNotificationCenterDelegate {

    var window: UIWindow?
    var fcmTokenUser : String?
    var firsTimeUsingApp = true

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        FirebaseApp.configure()


        print(NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).last! as String)


        // To get FCM token that will be sent to APNS via Google FCM
        if #available(iOS 10.0, *) {
            // For iOS 10 display notification (sent via APNS)
            UNUserNotificationCenter.current().delegate = self

            let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
            UNUserNotificationCenter.current().requestAuthorization(
                options: authOptions,
                completionHandler: {_, _ in })
        } else {
            let settings: UIUserNotificationSettings =
                UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
            application.registerUserNotificationSettings(settings)
        }

        application.registerForRemoteNotifications()


        Messaging.messaging().delegate = self
        let token = Messaging.messaging().fcmToken
        fcmTokenUser = token

        checkFirstTimeUsingAppOrNot()
        moveToNextPage()



        // to make status bar in the light mode (in info.plist it also has to be set 'View controller-based status bar appearance' to NO)
        UIApplication.shared.statusBarStyle = .lightContent


        return true
    }



    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String){
         // This callback is fired at each app startup (when the user install the app for the very first time) and whenever a new token is generated due to The app is restored on a new device, The user uninstalls/reinstall the app, The user clears app data.

        // after fcm generated for the very first time,then fcm can also be retrieved in the 'didFinishLaunchingWithOptions' method above (let token = Messaging.messaging().fcmToken)


        fcmTokenUser = fcmToken



        moveToNextPage()



    }




    private func application(application: UIApplication,
                     didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
        Messaging.messaging().apnsToken = deviceToken as Data
    }





}

如何解决这个问题？

Answer 1

iOS 会始终记住您的应用程序角标(Badge)计数，即使您卸载应用程序并重新安装也是如此。要移除角标(Badge)，您必须执行以下任一操作，

1. 使用 badge = 0 向您的应用发送另一个推送通知。
2. 使用以下代码 UIApplication.shared.applicationIconBadgeNumber = 0 每当用户打开您的应用程序时，您自己删除角标(Badge)计数。在 Appdelegate 的 didBecomeActive(:) 方法中添加这行代码。

谢谢。