ios Facebook SDK v4.x access token null despite being logged in via FBSDKLoginButton

Question

My facebook access token is null despite the fact that the button shows that I\'m logged in. Anyone know why this would be?

From RootViewController.m

Answer 1

You could build the logic around waiting for FBSDKAccessTokenDidChangeNotification notification in your ViewController's code.

In your AppDelegate.m:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // ...

    // add observer BEFORE FBSDKApplicationDelegate's - application:didFinishLaunchingWithOptions: returns
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(fbAccessTokenDidChange:) 
                                                 name:FBSDKAccessTokenDidChangeNotification 
                                               object:nil];

    return [[FBSDKApplicationDelegate sharedInstance] application: application     didFinishLaunchingWithOptions: launchOptions];
}

- (void)fbAccessTokenDidChange:(NSNotification*)notification
{
    if ([notification.name isEqualToString:FBSDKAccessTokenDidChangeNotification]) {
        if ([FBSDKAccessToken currentAccessToken]) {
            // token is ready to be used in the app at this point
        }
    }
}