Xamarin Firebase iOS 11未生成FCM令牌

Question

My app registers with firebase for push notifications, receives a token, and then provides that token as a querystring parameter of the url loaded by a webview.

Although the code executes and no failures are reported, the token is always null in iOS 11.

The below code works on iOS v9.x on either remote simulator or installed on a device, but does not work in either environment when iOS v11.x.

Has anyone experienced this? Anyone have helpful suggestions? Thank you in advance for your assistance, I'm pulling out what's left of my hair over here.

I am using the following packages/versions:

• Xamarin.Firebase.iOS.CloudMessaging v2.0.4.1
• Xamarin.Firebase.iOS.Core v4.0.13
• Xamarin.Firebase.iOS.InstanceId v2.0.8

From AppDelegate.cs:

    public override bool FinishedLaunching (UIApplication application, NSDictionary launchOptions)
    {
        // Override point for customization after application launch.
        // If not required for your application you can safely delete this method

        // Register your app for remote notifications.
        if (UIDevice.CurrentDevice.CheckSystemVersion(10, 0))
        {
            // iOS 10 or later
            var authOptions = UNAuthorizationOptions.Alert | UNAuthorizationOptions.Badge | UNAuthorizationOptions.Sound;
            UNUserNotificationCenter.Current.RequestAuthorization(authOptions, (granted, error) =>
            {
                System.Console.WriteLine(granted);
            });

            // For iOS 10 display notification (sent via APNS)
            UNUserNotificationCenter.Current.Delegate = this;

            // For iOS 10 data message (sent via FCM)
            Messaging.SharedInstance.Delegate = this;
        }
        else
        {
            // iOS 9 or before
            var allNotificationTypes = UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound;
            var settings = UIUserNotificationSettings.GetSettingsForTypes(allNotificationTypes, null);
            UIApplication.SharedApplication.RegisterUserNotificationSettings(settings);
        }

        UIApplication.SharedApplication.RegisterForRemoteNotifications();

        //configure firebase analytics.
        App.Configure();

        DoFCMConnect();
        return true;
    }

    private void DoFCMConnect()
    {
        Messaging.SharedInstance.ShouldEstablishDirectChannel = true;

        Console.WriteLine("Connected to FCM");

        //removed when updated to newest firebase version
        //Messaging.SharedInstance.Connect(error => {
        //    if (error != null)
        //    {
        //        System.Console.WriteLine(String.Format("Re-Connection to FCM Failed: {0}", error.ToString()));
        //    }
        //    else
        //    {
        //        System.Console.WriteLine("Re-Connected to FCM.");
        //    }
        //});
    }

From WebViewController.cs:

public override void ViewDidLoad()
    {
        string url = "https://www.mydomainname.com"; // NOTE: https secure request is required.

        string token = InstanceId.SharedInstance.Token;
        string fcm = Messaging.SharedInstance.FcmToken;

        if (token == null && fcm != null)
        {
            token = fcm;
        }

        if (String.IsNullOrEmpty(token))
        {
            url += "/login";
        }
        else
        {
            url += "/app-in/{0}"; //page accepts token and associates it to the user after login.
            url = String.Format(url, System.Web.HttpUtility.UrlEncode(token));
        }

        WebView.LoadRequest(new NSUrlRequest(new NSUrl(url)));

    }

Both string token and string fcm contain a value for iOS 9, however both are null in iOS 11.

Answer 1

It is a known issue , refer to here .

Try the steps provided by rsattar.

• downgrade FirebaseInstanceID to 2.0.0

• place UIApplication.shared.registerForRemoteNotifications() at first line in FinishedLaunching .

• uninstall/reinstall your app.