Logout and reset UITabBarController - ios

Question

I'm aware that there are some questions out there that are similar to this question, however, a lot of them are in Objective C and I haven't been able to find a really applicable solution yet that works.
The main problem I am having is that when I log out of one account in my app, then log into another, the tab bar is not reset, and it displays the previously signed in users data. In other words, I need a way to "reset" the app back to the state it was in before any user had signed in.
I have tried to achieve this by writing a function inside App Delegate (setupTabBarController) and calling it when the user logs out, but no such luck yet.
This is what I have so far:
Logout code:
#objc func handleSignOutButtonTapped() {
let signOutAction = UIAlertAction(title: "Sign Out", style: .destructive) { (action) in
do {
try Auth.auth().signOut()
let welcomeControl = WelcomeController()
let welcomeNavCon = UINavigationController(rootViewController: welcomeControl)
self.present(welcomeNavCon, animated: true, completion: nil)
} catch let err {
print("Failed to sign out with error", err)
Service.showAlert(on: self, style: .alert, title: "Sign Out Error", message: err.localizedDescription)
}
}
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
Service.showAlert(on: self, style: .actionSheet, title: nil, message: nil, actions: [signOutAction, cancelAction]) {
}
let delegate = AppDelegate()
delegate.setupTabBarController()
}
Part of my App Delegate:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
FirebaseApp.configure()
FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
setupTabBarController()
return true
}
func setupTabBarController() {
window = UIWindow()
window?.makeKeyAndVisible()
let vc = MainTabBarController()
let controller = UINavigationController(rootViewController: vc)
window?.rootViewController = controller
}
Sign in code:
#objc func handleNormalLogin() {
hud.textLabel.text = "Signing In..."
hud.show(in: view, animated: true)
//TODO
guard let email = emailTextField.text else { return }
guard let password = passwordTextField.text else { return }
Auth.auth().signIn(withEmail: email, password: password) { (user, error) in
if let error = error {
print("Error signing in: \(error)")
return
}
//sucessfully signed in
self.hud.dismiss(animated: true)
self.dismiss(animated: true, completion: nil)
}
}
Any help is really appreciated, I have been stuck on this for a few hours now and I really want to understand what I'm doing wrong.
Cheers

Answer 1

Problem
When you write let delegate = AppDelegate(). It means that you create a new AppDelegate. Instead of using current AppDelegate, you use another AppDelegate. That's why setupTabBarController method doesn't affects anything.
Calling setupTabBarController at the end of handleSignOutButtonTapped isn't a good idea. Because it will replace current rootViewController with UINavigation of MainTabBarController.
Answer
Use self.tabBarController? instead of self to present welcomeNavCon.
Don't call setupTabBarController at the end of handleSignOutButtonTapped method.
Recreate and set new viewControllers for MainTabBarController.
Code
#objc func handleSignOutButtonTapped() {
let signOutAction = UIAlertAction(title: "Sign Out", style: .destructive) { (action) in
do {
try Auth.auth().signOut()
let welcomeControl = WelcomeController()
let welcomeNavCon = UINavigationController(rootViewController: welcomeControl)
self.tabBarController?.present(welcomeNavCon, animated: true) {
let appDelegate = UIApplication.shared.delegate as! AppDelegate;
appDelegate.resetTabBarController();
};
} catch let err {
print("Failed to sign out with error", err)
Service.showAlert(on: self, style: .alert, title: "Sign Out Error", message: err.localizedDescription)
}
}
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
Service.showAlert(on: self, style: .actionSheet, title: nil, message: nil, actions: [signOutAction, cancelAction]) {
}
}
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var tabBarController : UITabBarController?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
FirebaseApp.configure()
FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
setupTabBarController()
return true
}
func setupTabBarController() {
window = UIWindow()
window?.makeKeyAndVisible()
let vc = MainTabBarController()
let controller = UINavigationController(rootViewController: vc)
window?.rootViewController = controller
}
func resetTabBarController() -> Void {
let viewControllerAtIndex1 = ...
let viewControllerAtIndex2 = ...
let viewControllerAtIndex3 = ...
tabBarController?.viewControllers = [viewControllerAtIndex1, viewControllerAtIndex2, viewControllerAtIndex3];
}
}