Swift: how to show a tab bar controller after a login view

Question

I have seen many posts similar to this here but they are all about Objective-C while I am developing my app in Swift. As you can see from the image I have a login screen view and I correctly implemented the login mechanism.

Now I would like that when the login has succedeed, then the tab bar controller is showed. In my login view controller I have this function for login:

var finalURL:NSString = "\(Settings.webServerLoginURL)?username=\(username)&password=\(password)"

        LoginService.requestLoginWithURL(NSURL(string: finalURL as String)!, completionHandler: { (success) -> Void in
            if (success) {
                NSLog("Login OK")

                /* Scarica dal database i tasks di LoggedUser.id */
                /* Redirect al tab HOME dell'applicazione dove si mostrano il numero di task
                di quell'utente ed in cima "BENVENUTO: name surname" */


            }

            else {
                self.alertView.title = "Autenticazione fallita!"
                self.alertView.message = "Username o passowrd."
                self.alertView.delegate = self
                self.alertView.addButtonWithTitle("OK")
                self.alertView.show()
            }

So I think that I should show tab bar controller after

NSLog("Login OK")

but I don't know how. I am a beginner of Swift/XCode...if you can explain me. Thanks to all who have read.

Answer 1

To show tab bar controller from Login page, connect the Login page and TabbarController with a Show segue and give it an identifier in attributes inspector (Say "mySegueIdentifier").

To add segue, just right click and drag from Login view controller to TabbarController.

In successful Login you can simply call "performSegueWithIdentifier" method as follows

self.performSegue(withIdentifier: "mySegueIdentifier", sender: nil)

In your case you call it after this line.

NSLog("Login OK")

If you don't want to navigate from Login page to TabbarController, you can also set it as rootViewController after successful Login. To do this, set an identifier to TabbarController (Say "myTabbarController")

let appDelegate = UIApplication.shared.delegate! as! AppDelegate
let initialViewController = self.storyboard!.instantiateViewController(withIdentifier: "myTabbarControllerID")
appDelegate.window?.rootViewController = initialViewController
appDelegate.window?.makeKeyAndVisible()

Edit:

Swift 3

 let appDelegate = UIApplication.shared.delegate! as! AppDelegate
    
 let initialViewController = self.storyboard!.instantiateViewController(withIdentifier: "myTabbarControllerID") 
 appDelegate.window?.rootViewController = initialViewController
 appDelegate.window?.makeKeyAndVisible()

Happy coding.. :)