I am developing an ios app using the Facebook SDK to login.
I have set a LogInViewController as the initial View Controller in the Storyboard, from where the user logins using the FB account.
I have another ViewController which is loaded correctly once the user logs in.
In the AppDelegate file I am checking for currentAccessToken and if it is not nil, I am loading directly the second ViewController, because the user is already logged in.
However, the currentAccessToken is always nil if I quit the app and relaunch it. It only works if I press the home button and re-open the app while it's still running in the background.
Here are the details in the code:
AppDelegate.swift
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
self.customNavigationBar()
if (!isIcloudAvailable()) {
self.displayAlertWithTitle("iCloud", message: "iCloud is not available." +
" Please sign into your iCloud account and restart this app")
return true
}
if (FBSDKAccessToken.currentAccessToken() != nil) {
self.instantiateViewController("MapViewController", storyboardIdentifier: "Main")
}
return FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
}
func application(application: UIApplication, openURL url: NSURL, sourceApplication: String?, annotation: AnyObject) -> Bool {
return FBSDKApplicationDelegate.sharedInstance().application(
application,
openURL: url,
sourceApplication: sourceApplication,
annotation: annotation)
}
func applicationWillResignActive(application: UIApplication) {
FBSDKAppEvents.activateApp()
}
func applicationDidBecomeActive(application: UIApplication) {
FBSDKAppEvents.activateApp()
}
LogInViewController.swift
override func viewDidLoad() {
super.viewDidLoad()
// Listen to the Facebook notification and when received, execute func handleFBSessionStateChangeWithNotification
NSNotificationCenter.defaultCenter().addObserver(self, selector:"handleFBSessionStateChangeWithNotification:", name: "SessionStateChangeNotification", object: nil)
}
func handleFBSessionStateChangeWithNotification(notification: NSNotification) {
// Switch to MapViewController when logged in
if ((FBSDKAccessToken.currentAccessToken()) != nil) {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let mapViewController = storyboard.instantiateViewControllerWithIdentifier("MapViewController") as! MapViewController
self.presentViewController(mapViewController, animated: false, completion: nil)
}
}
I don't know if it is related, but I am also getting a warning for the MapViewController because there is no segue put towards it from the Storyboard:
Warning: Attempt to present MapViewController whose view is not in the window hierarchy!