Facebook login - stays at white web page SWIFT

Question

In my LoginViewController, I implemented the FBSDKLoginButtonDelegate and imported the FBSDKLoginKit & FBSDKCoreKit. My code in viewDidLoad is as appears:

Answer 1

The AppDelegate was missing:

func application(application: UIApplication,
             openURL url: NSURL,
             sourceApplication: String?,
             annotation: AnyObject?) -> Bool {
  return FBSDKApplicationDelegate.sharedInstance().application(application,
                                                  openURL: url,
                                                  sourceApplication: sourceApplication,
                                                         annotation: annotation)
 }