Is there an easy way to log out when I click on the rear navigation item on the navigation controller in quick mode 4?

Question

I have a login screen that has an email address and password. I am using firebase Auth.

The login screen is integrated into the navigation controller. On the login screen, it goes to UserDetailsController. The navigation bar has a “rear” navigation element that comes with the navigation controller. I can't drag this to be the way out.

I was wondering if there is an easy way when the “reverse” is pressed and the user returns to the login page to log out. The code to exit the system is relatively simple using Firebase Auth. The problem I am running into works in LoginController if I return here from UserDetailsController.

I read about using self.presentingcontroller to determine which controller I came back from, but I keep getting zero. And I was not sure if this is the best / only option for determining which controller I came back from.

Thanks.

Answer 1

It looks pretty simple. Hope this code helps.

• In viewDidLoad add the following function:

  override func viewDidLoad() { super.viewDidLoad() setupLogOut() } 

• Then configure a function like this using the selector handler method, for example:

   fileprivate func setupLogOut() { navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Back", style: .plain, target: self, action: #selector(handleLogOut)) } @objc func handleLogOut() { do { try Auth.auth().signOut() // Present the login controller let loginController = LoginController() let navController = UINavigationController(rootViewController: loginController) self.present(navController, animated: true, completion: nil) } catch let signOutErr { print("Failed to sign out:", signOutErr) } } 

Answer 2

If you do not want to add the method button back. You can also use the method below to log out:

 override func viewWillDisappear(animated: Bool) { // Your sign out logic here.. } 

The method call is called when you return to the input controller.