iOS：Firebase 令牌返回 null

Question

I am currently trying to implement Firebase Cloud Messaging by following the official Firebase documents.

I have settled the certificates and the provisioning profiles with Push Notifications enabled. I have also installed all the necessary frameworks(FirebaseMessaging,Firebase) using CocoaPods and they seem to work fine.

At the app delegate, I tried to initialize the Firebase cloud messaging token with the code below.

let token = FIRInstanceID.instanceID().token()!

I have also set GCM to enabled and there is a GCM sender id value in the GoogleService-Info.plist.

The error that I am getting is as follows:

2016-11-29 16:11:12.358 Firebasesample[3852:122151] Firebase automatic screen reporting is enabled. Call +[FIRAnalytics setScreenName:setScreenClass:] to set the screen name or override the default screen class name. To disable automatic screen reporting, set the flag FirebaseAutomaticScreenReportingEnabled to NO in the Info.plist

2016-11-29 16:11:12.419: Firebase messaging not setup correctly, nil senderID. fatal error: unexpectedly found nil while unwrapping an Optional value

Thank you in advance for any advice/help.

Answer 1

Was already answered in the comment without the implementation:

Make sure you follow the setup guide on https://firebase.google.com/docs/cloud-messaging/ios/client .

In your didFinishLaunchingWithOptions add the following method (after FIRApp.configure() ).

NotificationCenter.default.addObserver(self, selector: #selector(tokenRefreshNotification(_:)), name: NSNotification.Name.firInstanceIDTokenRefresh, object: nil)

When your token is refreshed, it will call:

func tokenRefreshNotification(_ notification: Notification) {

    guard let token = FIRInstanceID.instanceID().token() else {
        QL3("No firebase token, aborting registering device")
        return nil
    }

    //register your token somewhere..
    registerToken(token)
}

Answer 2

For those who still having problems on get the token, maybe is because the token has not yet been generated.

On the guide( https://firebase.google.com/docs/cloud-messaging/ios/client ) you can find this part:

When you need the current token, retrieve it. This may return null if the token has not yet been generated.

I hope it helps.

Answer 3

I was stuck with this issue, was not receiving firebase push notification on the IOS device ABOVE IOS-10 because firebase token might be longer than the data type you chose it to be stored with. Check your datatype for the token column. I Have converted from varchar to text and it works and saved our day.

Regards, Gurminder