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

The FBSDKApplicationDelegate needs to be called first to resolved cached tokens. Since you are setting the root view controller immediately, that calls your viewDidLoad before the FBSDKApplicationDelegate. Instead, you can move the FBSDKApplicationDelegate up:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  // Override point for customization after application launch.
  [FBSDKLoginButton class];
  BOOL r = [[FBSDKApplicationDelegate sharedInstance] application:application didFinishLaunchingWithOptions:launchOptions];

  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

  [self.window setRootViewController:[[RootViewController alloc] init]];

  [self.window makeKeyAndVisible];

  [self.window setBackgroundColor:[UIColor purpleColor]];


  return r;
}