Unable to navigate to other view controller after Google sign-in - swift

Question

How can I go to another view controller after successfully signing with google? I've tried "self.inputViewController?.performSegue(withIdentifier: "goToMain", sender: self)" in my App Delegate but not getting any respond. Am I supposed to add the method in App Delegate or the view controller with the sign-in button?
App Delegate
import UIKit
import Firebase
import GoogleSignIn
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate{
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
FirebaseApp.configure()
GIDSignIn.sharedInstance()?.clientID = "my_client_id"
GIDSignIn.sharedInstance()?.delegate = self
return true
}
func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
if let error = error {
print(error)
return
}
guard
let authentication = user?.authentication,
let idToken = authentication.idToken
else {
return
}
let credential = GoogleAuthProvider.credential(withIDToken: idToken,
accessToken: authentication.accessToken)
Auth.auth().signIn(with: credential) { authResult, error in
if let error = error {
let authError = error as NSError
print(authError.localizedDescription)
return
}
self.inputViewController?.performSegue(withIdentifier: "goToMain", sender: self)
}
}
func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
return GIDSignIn.sharedInstance().handle(url)
}
// MARK: UISceneSession Lifecycle
func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
// Called when a new scene session is being created.
// Use this method to select a configuration to create the new scene with.
return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
}
func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
// Called when the user discards a scene session.
// If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
// Use this method to release any resources that were specific to the discarded scenes, as they will not return.
}
}

Answer 1

Are you sure about the inputViewController is not nil? This may a reason for not working.
You can add a function to test this, or you can use the print function to check, or, you can use debug point to check inputViewController is nil or not.
I'd like to add comment but I don't have enough reputation point :).
Good luck.