restarting app causes NSInvalidArgumentException - ios

Question

So, I do a segue on fresh install of my app that shows a dialog that asks user to setup some variables that the app needs. Then, for admin users, I have an option to clear the app cache then restart the app so the user can redo the setup if they wanted to.
I restart my app using the code below.
func restartApplication () {
let viewController = SomeViewController()
let navCtrl = UINavigationController(rootViewController: viewController)
guard
let window = UIApplication.shared.keyWindow,
let rootViewController = window.rootViewController
else {
return
}
navCtrl.view.frame = rootViewController.view.frame
navCtrl.view.layoutIfNeeded()
UIView.transition(with: window, duration: 0.3, options: .transitionCrossDissolve, animations: {
window.rootViewController = navCtrl
})
}
It works. But when the app reaches viewDidAppear() and needs to show my dialog, the app crashes saying
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason:
'Receiver (<AppName.SomeViewController: 0x150dda00>) has no segue with identifier 'showSetup''
I think I messed up something for the restart, or I still need to do something for it to work but I don't know what is it.
I'm currently converting my android app to iOS so I want to do everything that I could convert.
This is how I do the segue.
DispatchQueue.main.async {
self.performSegue(withIdentifier: "showSetup", sender: self)
}

Answer 1

Since your "relaunched" view controller doesn't come from the storyboard, any references to segues (which relies on the storyboard) will fail.
You need something like:
func restartApplication () {
let navCtrl = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("NavController")
guard
let window = UIApplication.shared.keyWindow,
let rootViewController = window.rootViewController
else {
return
}
navCtrl.view.frame = rootViewController.view.frame
navCtrl.view.layoutIfNeeded()
UIView.transition(with: window, duration: 0.3, options: .transitionCrossDissolve, animations: {
window.rootViewController = navCtrl
})
}