How to unsubscribe from FCM notifications after logout from app?

Question

I have implemented Firebase cloud messaging in my app for push notifications. Everything working fine. But notifications are getting even user logged out from app.

I heard that, I need to delete the FCM token when user logged out from app.

So I did like this in logout method:

-(void)logout{
        [[FIRInstanceID instanceID] deleteIDWithHandler:^(NSError *error){
            NSLog(@"%@",error);
        }];
}

But this is not working and next time when user logged in [[FIRInstanceID instanceID]token] is coming as null.

How to do this?

Answer 1

You can delete the token, but it's better to simply cancel the subscription. How to do that, depends on how you subscribed to the updates in the first place.

If you subscribed to a topic, you'll want unsubscribe when the user signs out.