Abmelden von Google Anmelden und Benutzer zur Anmeldeseite zurückkehren: Swift/Xcode

Question

Ich habe erfolgreich eine Google Anmeldung für meine App erstellt. Dies funktioniert, wenn der Benutzer eingeloggt ist, wird der Benutzer zu ein Tab-Controller.

Jetzt habe ich Schaltflächen auf beiden Elementen in der Registerkarte Controller, so dass der Benutzer abmelden kann. Ich möchte wissen, wie Sie es einrichten können, damit der Benutzer auf die Schaltfläche "Abmelden" klicken kann, die ihn in der App erfolgreich aus Google abmeldet, und den Benutzer anschließend zur Anmeldeseite zurückführt. Hier

ist ein Screenshot von meinem Main.storyboard:

MainStoryboard Screenshot

Hier ist der Code für meine AppDelegate Datei:

AppDelegate.swift

import UIKit 
import Firebase 
import GoogleSignIn 

@UIApplicationMain 
class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate { 

    var window: UIWindow? 


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { 

     FIRApp.configure() 

     GIDSignIn.sharedInstance().clientID = FIRApp.defaultApp()?.options.clientID 
     GIDSignIn.sharedInstance().delegate = self 

     if GIDSignIn.sharedInstance().hasAuthInKeychain() { 
      print("User has been successfully signed in with Google") 
      let sb = UIStoryboard(name: "Main", bundle: nil) 
      if let tabBarVC = sb.instantiateViewController(withIdentifier: "TabController") as? UITabBarController { 
       window!.rootViewController = tabBarVC 
      } 
     } else { 
      print("User has failed in signing in with Google") 
      let sb = UIStoryboard(name: "Main", bundle: nil) 
      if let tabBarVC = sb.instantiateViewController(withIdentifier: "LogInViewController") as? ViewController { 
       window!.rootViewController = tabBarVC 
      } 
     } 

     return true 
    } 



    func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) { 
     if let err = error { 
      print("Failed to log into Google: ", err) 
      return 
     } 

     print("Successfully logged into Google", user) 

     guard let idToken = user.authentication.idToken else { return } 
     guard let accessToken = user.authentication.accessToken else { return } 
     let credentials = FIRGoogleAuthProvider.credential(withIDToken: idToken, accessToken: accessToken) 

     FIRAuth.auth()?.signIn(with: credentials, completion: { (user, error) in 
      if let err = error { 
       print("Failed to create a Firebase User with Google account: ", err) 
       return 
      } 

      guard let uid = user?.uid else { return } 
      print("Successfully logged into Firebase with Google", uid) 
     }) 
    } 


    func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool { 



     GIDSignIn.sharedInstance().handle(url, 
              sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String!, 
              annotation: options[UIApplicationOpenURLOptionsKey.annotation]) 

     return true 
    } 

    func applicationWillResignActive(_ application: UIApplication) { 
     // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state. 
     // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game. 
    } 

    func applicationDidEnterBackground(_ application: UIApplication) { 
     // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
     // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. 
    } 

    func applicationWillEnterForeground(_ application: UIApplication) { 
     // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background. 
    } 

    func applicationDidBecomeActive(_ application: UIApplication) { 
     // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface. 
    } 

    func applicationWillTerminate(_ application: UIApplication) { 
     // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 
    } 


} 

Und ich f benötigt, ViewController.swift Datei:

import UIKit 
import Firebase 
import GoogleSignIn 

class ViewController: UIViewController, GIDSignInUIDelegate { 

    override func viewDidLoad() { 
     super.viewDidLoad() 


     setupGoogleButtons() 
    } 

    fileprivate func setupGoogleButtons() { 
     //add google sign in button 
     let googleButton = GIDSignInButton() 
     googleButton.frame = CGRect(x: 16, y: 116 + 66, width: view.frame.width - 32, height: 50) 
     view.addSubview(googleButton) 
     //custom google button 
     let customButton = UIButton(type: .system) 
     customButton.frame = CGRect(x: 16, y: 116 + 66 + 66, width: view.frame.width - 32, height: 50) 
     customButton.backgroundColor = .orange 
     customButton.setTitle("Custom Google Sign In", for: .normal) 
     customButton.addTarget(self, action: #selector(handleCustomGoogleSign), for: .touchUpInside) 
     customButton.setTitleColor(.white, for: .normal) 
     customButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 14) 
     view.addSubview(customButton) 

     GIDSignIn.sharedInstance().uiDelegate = self 
    } 

    func handleCustomGoogleSign() { 
     GIDSignIn.sharedInstance().signIn() 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 


} 

Answer 1

Es ist einfach zu tun:

Wenn Sie in der action abzumelden, müssen Sie nur die window ‚s rootvc zu logint vc

window!.rootViewController = login vc