Google login user profile not updated to Firebase - swift

Question

I am new to Xcode and I am working on my Google sign-in project. After successfully logging in with google, I cannot find the user profile in firebase. I think I am missing the code for uploading user credentials to firebase. I can barely understand the documentation and I don't know what to do. By the way, how can I navigate to another view controller after signing in? I tried lots of ways but none of them work. Any help is appreciated.
My AppDelegate code:
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 = "//I have it in my actual code"
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)
}
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.
}
}
The code of the log-in view controller
import UIKit
import GoogleSignIn
class WelcomeViewController: UIViewController {
#IBOutlet weak var gooleButton: GIDSignInButton!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
GIDSignIn.sharedInstance()?.presentingViewController = self
gooleButton.style = .wide
gooleButton.colorScheme = .dark
}
}

Answer 1

From what I see your code signs the user in with Google to get the credentials, but then doesn't call signIn(with: ) which is needed in order to sign in to Firebase Authentication.
Have a look at Step 3: authenticate with Firebase. While the code there looks a bit intimidating, that's mostly because it handled many different cases. At its minimum you can sign in to Firebase with your credentials by doing:
Auth.auth().signIn(with: credential) { authResult, error in
if let error = error {
let authError = error as NSError
print(error.localizedDescription)
return
}
// User is signed in
// ...
}