Question

我有一个Xamarin表单iOS应用程序，可与Firebase Cloud Messaging一起使用，以使用Xamarin.Firebase.iOS.CloudMessaging v3.1.2进行推送通知

我可以在DidReceiveRegistrationToken方法中正确获取FCM令牌，然后调用REST端点https://fcm.googleapis.com/fcm/send，通知将按预期发送。

问题是，每当有未处理的异常或当前线程被手动终止且我的应用崩溃时，FCM令牌将被注销，并且相同的API调用将导致"error": "NotRegistered"响应。

到那时，我所能做的就是卸载并重新安装该应用程序以获取新的FCM令牌，然后一切恢复正常。

这是我的AppDelegate.cs中主要的Firebase设置代码

       public void RegisterFirebaseNotifications()
        {
            UNUserNotificationCenter.Current.Delegate = this;

            var authOptions = UNAuthorizationOptions.Alert | UNAuthorizationOptions.Badge | UNAuthorizationOptions.Sound;
            UNUserNotificationCenter.Current.RequestAuthorization(authOptions, (granted, error) =>
            {
                if (error != null)
                {
                    Log.Error("Error occurred getting authorization from user app");
                    Log.Error(error.Description);
                }
            });

            UIApplication.SharedApplication.RegisterForRemoteNotifications();

            Messaging.SharedInstance.Delegate = this;

            // To connect with FCM. FCM manages the connection, closing it
            // when your app goes into the background and reopening it
            // whenever the app is foregrounded.
            Messaging.SharedInstance.ShouldEstablishDirectChannel = true;
        }

        #region IMessagingDelegate

        [Export("messaging:didReceiveRegistrationToken:")]
        public void DidReceiveRegistrationToken(Messaging messaging, string fcmToken)
        {
            Utils.Settings.FirebaseNotificationToken = fcmToken;
        }

        [Export("messaging:didReceiveMessage:")]
        public void DidReceiveMessage(Messaging messaging, RemoteMessage remoteMessage)
        {
            HandleMessage(remoteMessage.AppData);

            LogInformation(nameof(DidReceiveMessage), remoteMessage.AppData);
        }
        #endregion

Answer 1

我使用的Firebase Cloud Messaging版本存在问题。我发现this issue on Github提出了要降级到的版本，并解决了我的问题。

应用中未处理的异常后未注册FCM令牌

1 个答案: