Ios 如何直接从Google登录web链接切换到另一个视图控制器？

我有一个带有谷歌登录按钮的登录屏幕。我可以点击按钮，然后按照链接使用我的谷歌帐户登录，但随后应用程序返回到登录屏幕，然后切换到我的应用程序的主屏幕。如何解决此问题

以下是我在AppDelegate屏幕上的代码：

class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        
        FirebaseApp.configure()
        
        GIDSignIn.sharedInstance()?.clientID = FirebaseApp.app()?.options.clientID
        GIDSignIn.sharedInstance()?.delegate = self
        
        return true
    }
    
    func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
        
        if let error = error {
            return
        }
        
        guard let googleAuth = user.authentication else { return }
        let googleCredential = GoogleAuthProvider.credential(withIDToken: googleAuth.idToken, accessToken:googleAuth.accessToken)
        
        Auth.auth().signIn(with: googleCredential) { (result, error) in
            if let error = error {
                return
            }
            
            // Code to post user data to Firebase 
        }
    }
        
    func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
        return GIDSignIn.sharedInstance().handle(url)
    }

以下是我在登录屏幕上的代码：

class LogIn_VC: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Listens for changes in user auth status
        authHandler = firebaseAuth.addStateDidChangeListener({ (auth, user) in

            DispatchQueue.main.async {
              if self.firebaseAuth.currentUser != nil {
                // Set new rootVC as MainVC (when user logs in)
                let mainVC = storyboard?.instantiateViewController(identifier: "MainVC") as? Main_VC
                view.window?.rootViewController = mainVC
                view.window?.makeKeyAndVisible()
              }
            }
        })
    }
    
    
    // Login with google button
    @IBAction func logInWithGoogle(_ sender: Any) {
        GIDSignIn.sharedInstance()?.presentingViewController = self
        
        GIDSignIn.sharedInstance()?.signIn()
    } 
}

---

事情不是这样的。 我不确定firebase和登录是否成功，但如果成功完成处理程序，您应该尝试以下操作：

let mainVC = storyboard?.instantiateViewController(identifier: "MainVC") as? Main_VC
let nav = UINavigationController(root: mainVC)
self.present(nav, animated: true, completion: nil)

检查新根目录的显示样式，您不希望用户只返回登录页面