Facebook access token nil after app relaunch

Question

I'm developing an app on iOS with Firebase Auth and Facebook. I want to use Facebook graph sdk after login with Facebook. It's working fine the first time. But when I re-launch the app, the graph API don't work :

An active access token must be used to query information about the current user.

and the following code is nil :

FBSDKAccessToken.current()?.tokenString

BUT the user is logged with Firebase Auth :

// check if user is logged
FIRAuth.auth()?.addStateDidChangeListener({ (auth, user) in
    if user != nil{
        print("User logged") ...

Is there a way to get the current Facebook access token via Firebase Auth ? Or I have to persist the access token for using it later ? Or re-log user each time (not user friendly at all) ?

My solution (but don't know if best way) :

save "access token" in firebase database at fb login
when app restart, get the persisted "access token" from database
check if the "access token" is still valid
if not, re-log user and get a new "access token" and save it

Update

I noticed that i was getting this message :

Falling back to loading access token from NSUserDefaults because of simulator bug

so I checked my code in a real device, and it's working now, the access token is persisted through the app relaunch.

Xero Xero · Accepted Answer · 2017-05-26T12:10:12

I noticed that I was getting this message :

Falling back to loading access token from NSUserDefaults because of simulator bug

so I checked my code in a real device, and it's working now, the access token is persisted through the app relaunch.

Facebook access token nil after app relaunch

1 Answers