Swift Facebook Login

Question

I\'m trying to convert the following code lines from Objective C to the new programming language Swift. Maybe someone can help me and outline the differences. Would be awesome!<

Answer 1

Here is my answer: Few keywords like FBSessionStateCreatedTokenLoaded thrown error for me.. So This might helps

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

  // Whenever a person opens the app, check for a cached session
    if FBSession.activeSession().state == FBSessionState.CreatedTokenLoaded
    {

         // If there's one, just open the session silently, without showing the user the login UI
        FBSession.openActiveSessionWithReadPermissions(["public_profile"], allowLoginUI: false, completionHandler: {
            (session, state, error) -> Void in
             self.sessionStateChanged(session, state: state, error: error)
        })
    }

 return true
}
 func sessionStateChanged(session : FBSession, state : FBSessionState, error : NSError?)
{
    // If the session was opened successfully
    if  state == FBSessionState.Open
    {
        println("Session Opened")
    }
    // If the session closed
    if state == FBSessionState.Closed
    {
        println("Closed")
    }
}

On Button click do Facebook login

 @IBAction func FacebookLoginPressed(Sender: AnyObject)
{
   if (FBSession.activeSession().state == FBSessionState.Open || FBSession.activeSession().state == FBSessionState.OpenTokenExtended)
    {
        // Close the session and remove the access token from the cache
        // The session state handler (in the app delegate) will be called automatically
        FBSession.activeSession().closeAndClearTokenInformation()
    }
    else
    {
        // Open a session showing the user the login UI
        // You must ALWAYS ask for public_profile permissions when opening a session
        FBSession.openActiveSessionWithReadPermissions(["public_profile"], allowLoginUI: true, completionHandler: {
            (session:FBSession!, state:FBSessionState, error:NSError!) in

            let appDelegate = UIApplication.sharedApplication().delegate as AppDelegate
             // Call the app delegate's sessionStateChanged:state:error method to handle session state changes
            appDelegate.sessionStateChanged(session, state: state, error: error)
        })
    }

}