为什么我收到通知后无法移除徽章？

Question

我正在尝试使用 Firebase Cloud Messaging 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，我将徽章编号设置为 1，如下图所示

此后，我在主屏幕上的应用程序图标将始终带有数字“1”的徽章，即使我尝试卸载并重新安装它，数字“1”的徽章仍然存在。

但是它只发生在我的iPhone上，如果我将其安装在另一部手机上，徽章将不会显示

我在应用程序委托中使用此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 将始终记住您的应用程序徽章计数，即使您卸载应用程序并再次安装也是如此。要删除您的徽章，您必须执行以下任一操作，

1. 使用

   badge = 0

   向您的应用程序发送另一个推送通知。
2. 每当用户打开您的应用程序时，使用以下代码

   UIApplication.shared.applicationIconBadgeNumber = 0

   自行删除徽章计数。在

   Appdelegate's didBecomeActive(:)

   方法中添加这行代码。

谢谢。

Answer 2

因为我一直在寻找 SwiftUI 解决方案，所以我想分享一下我的方法...

对于 Firebase 云消息传递，您正在 SwiftUI 代码中实现 AppDelegate（如 iOS 版 Firebase 网站上提到的），然后直接跳到 @main 结构...

就我而言...

@main
struct myApp: App {
    // this is for your Firebase Cloud Messaging solution...
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    
    // to read the current phase of the app
    @Environment(\.scenePhase) private var scenePhase

var body: some Scene {
    WindowGroup {
        ContentView()
            .onChange(of: scenePhase) { phase in
                // if app returns to the foreground do this:
                if phase == .active {
                    // if your scenePhase hits the .active status (means it came from the 
                    //background to the foreground OR is started) do the following..
                    UIApplication.shared.applicationIconBadgeNumber = 0
                }
                // if more phases are needed, add .inactive or .background
            }
    }
}
}