如何快速刷新 Firebase 推送通知

Question

当用户在第一次调用以下方法时将应用程序安装到他的设备中时，我在我的应用程序中使用了 Firebase 推送通知。

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

//Firebase Configure
FirebaseApp.configure()

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)
}

Messaging.messaging().delegate = self

application.registerForRemoteNotifications()

return true
   }

    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
Messaging.messaging().appDidReceiveMessage(userInfo)

// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
    print("Message ID: \(messageID)")
}

// Print full message.
print(userInfo)
   }

   func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
             fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {


// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
    print("Message ID: \(messageID)")
}

// Print full message.
print(userInfo)

completionHandler(UIBackgroundFetchResult.newData)
 }





    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
print("Firebase registration token: \(fcmToken)")

let dataDict:[String: String] = ["token": fcmToken]
NotificationCenter.default.post(name: Notification.Name("FCMToken"), object: nil, userInfo: dataDict)
// TODO: If necessary send token to application server.

defaultValues.set(fcmToken, forKey: "FCMToken")
defaultValues.synchronize()

  }
 @available(iOS 10, *)

extension AppDelegate : UNUserNotificationCenterDelegate {

// Receive displayed notifications for iOS 10 devices.
func userNotificationCenter(_ center: UNUserNotificationCenter,
                            willPresent notification: UNNotification,
                            withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    let userInfo = notification.request.content.userInfo

    // With swizzling disabled you must let Messaging know about the message, for Analytics
    // Messaging.messaging().appDidReceiveMessage(userInfo)

    // Print message ID.
    if let messageID = userInfo[gcmMessageIDKey] {
        print("Message ID: \(messageID)")
    }

    // Print full message.
    print(userInfo)

    // Change this to your preferred presentation option
    completionHandler([.alert])
}

  }

// MARK: - Push Notification MessagingDelegate methods.


  extension AppDelegate: MessagingDelegate{

func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
    print("Firebase registration token: \(fcmToken)")

    let dataDict:[String: String] = ["token": fcmToken]
    NotificationCenter.default.post(name: Notification.Name("FCMToken"), object: nil, userInfo: dataDict)
    // TODO: If necessary send token to application server.

    defaultValues.set(fcmToken, forKey: "FCMToken")
    defaultValues.synchronize()

    //Call Sending device info to api.
}

func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {

    defaultValues.set(fcmToken, forKey: "FCMToken")
    defaultValues.synchronize()

    //Call Sending device info to api.
    Helper.shared.appDelegate.SendingDeviceInfo()
}


func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) {
    print("Message data:", remoteMessage.appData)
}

 }

当用户按下登录按钮时，我点击了 api。 但我的问题是当用户注销并再次登录相同的 api 时再次点击但使用 nil fcm 令牌。 在注销时，我清除所有默认数据。 我们如何解决这个问题任何人都对我有帮助。

这是我的退出代码

func loggout(){
        //logout and reset root controller - Delete all userdefaults data.

        SVProgressHUD.dismiss()

        //Clear All Default values
        let domain = Bundle.main.bundleIdentifier!
        defaultValues.removePersistentDomain(forName: domain)
        defaultValues.synchronize()
        setRootControllerBeforeLogin()
    }

我使用此方法将 fcm 令牌发送到服务器，我在登录按钮操作中调用此方法。

func SendingDeviceInfo(){ 
        let fcmvalue = defaultValues.string(forKey: "FCMToken") ?? "" 
        let param:[String:Any] = ["registerID":fcmvalue]

        WebService.shared.apiDataPostMethod(url: deviceInfoURL, parameters: param) { (response, error) in
            if error == nil
            {
                print(param)
            }else{
               // print(error?.localizedDescription)
            }
        }
    }

Answer 1

firebase 的didReceiveRegistrationToken 仅在您调用注册推送通知时调用。

您的问题 - 注销时会清除 UserDefaults，因此“FCMToken”的值为零

解决方案- 1.首先不需要从UserDefaults中清除“FCMToken”，因为下次启动应用时会得到相同的令牌（并非总是如此）。Firebase令牌可以随时更改，但不会那么快。还有一件事，如果你安装应用程序并第一次运行，它总是会生成新的令牌。

1. 当您注销并再次登录时，再次调用注册推送通知（Firebase）。您将再次获得令牌，但更改更多的是您将获得相同的令牌。

编辑 您可以在删除之前从 UserDefaults 中获取 token 的值，稍后再重新分配。

    let token = UserDefaults.standard.value(forKey: "FCMToken")
        if let appDomain = Bundle.main.bundleIdentifier {
            UserDefaults.standard.removePersistentDomain(forName: appDomain)
      }
     UserDefaults.standard.set(token, forKey: "FCMToken")