Firebase 谷歌登录身份验证 AppDelegate- 使用未解析的标识符“isMFAEnabled”

Question

我是 iOS 开发的新手。我正在尝试将 google 登录添加到我的应用程序，但我遇到了一些问题。代码显示了一些“使用未解析的标识符‘isMFAEnabled”和“类型‘AppDelegate’的值没有成员‘showTextInputPrompt’”。请帮助我。我正在关注此文档 - https://firebase.google.com/docs/auth/ios/google-signin#swift_9 在此处输入图片说明

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 = FirebaseApp.app()?.options.clientID
        GIDSignIn.sharedInstance().delegate = self
        return true
    }

    func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
        return GIDSignIn.sharedInstance().handle(url)
    }
    func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
           if let error = error {
            print(error.localizedDescription)
             return
           }

           guard let authentication = user.authentication else { return }
           let credential = GoogleAuthProvider.credential(withIDToken: authentication.idToken,
                                                             accessToken: authentication.accessToken)
          Auth.auth().signIn(with: credential) { (authResult, error) in
            if let error = error {
              let authError = error as NSError
              if (isMFAEnabled && authError.code == AuthErrorCode.secondFactorRequired.rawValue) {
                // The user is a multi-factor user. Second factor challenge is required.
                let resolver = authError.userInfo[AuthErrorUserInfoMultiFactorResolverKey] as! MultiFactorResolver
                var displayNameString = ""
                for tmpFactorInfo in (resolver.hints) {
                  displayNameString += tmpFactorInfo.displayName ?? ""
                  displayNameString += " "
                }
                self.showTextInputPrompt(withMessage: "Select factor to sign in\n\(displayNameString)", completionBlock: { userPressedOK, displayName in
                  var selectedHint: PhoneMultiFactorInfo?
                  for tmpFactorInfo in resolver.hints {
                    if (displayName == tmpFactorInfo.displayName) {
                      selectedHint = tmpFactorInfo as? PhoneMultiFactorInfo
                    }
                  }
                  PhoneAuthProvider.provider().verifyPhoneNumber(with: selectedHint!, uiDelegate: nil, multiFactorSession: resolver.session) { verificationID, error in
                    if error != nil {
                      print("Multi factor start sign in failed. Error: \(error.debugDescription)")
                    } else {
                      self.showTextInputPrompt(withMessage: "Verification code for \(selectedHint?.displayName ?? "")", completionBlock: { userPressedOK, verificationCode in
                        let credential: PhoneAuthCredential? = PhoneAuthProvider.provider().credential(withVerificationID: verificationID!, verificationCode: verificationCode!)
                        let assertion: MultiFactorAssertion? = PhoneMultiFactorGenerator.assertion(with: credential!)
                        resolver.resolveSignIn(with: assertion!) { authResult, error in
                          if error != nil {
                            print("Multi factor finanlize sign in failed. Error: \(error.debugDescription)")
                          } else {
                            self.navigationController?.popViewController(animated: true)
                          }
                        }
                      })
                    }
                  }
                })
              } else {
                print(error.localizedDescription)
                return
              }
              // ...
              return
            }
            // User is signed in
            // ...
          }
       }
    
    func sign(_ signIn: GIDSignIn!, didDisconnectWith user: GIDGoogleUser!, withError error: Error!) {
          let firebaseAuth = Auth.auth()
        do {
          try firebaseAuth.signOut()
        } catch let signOutError as NSError {
          print ("Error signing out: %@", signOutError)
        }

Answer 1

因此，样板代码比您需要的代码多得多。这是我对您的 AppDelegate 的评论。

1. didFinishLaunchingWithOptions看起来不错。专业提示：添加此行以保持登录状态GIDSignIn.sharedInstance()?.restorePreviousSignIn()

2. 打开，选项按原样看起来不错。

3. didSignInFor user是令人纠结的地方。删除整个函数并将其替换为以下扩展（在类的括号之外）：

GIDSignInDelegate（也在类协议中删除）

    extension AppDelegate: GIDSignInDelegate {
    func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error?) {
        
        //handle sign-in errors
        if let error = error {
            if (error as NSError).code == GIDSignInErrorCode.hasNoAuthInKeychain.rawValue {
                print("The user has not signed in before or they have since signed out.")
            } else {
            print("error signing into Google \(error.localizedDescription)")
            }
        return
        }
        
        // Get credential object using Google ID token and Google access token
        guard let authentication = user.authentication else { return }
        
        let credential = GoogleAuthProvider.credential(withIDToken: authentication.idToken,
                                                        accessToken: authentication.accessToken)
        
        // Authenticate with Firebase using the credential object
        Auth.auth().signIn(with: credential) { (authResult, error) in
            if let error = error {
                print("authentication error \(error.localizedDescription)")
            }
        }
    } 
}

我今天对此进行了测试，目前正在运行（Swift 5/ios 13.6）。

Answer 2

TL;博士; 如果您不想启用多重身份验证，则可以删除该变量。

Firebase 文档提供了该变量作为您启用/禁用多重 (MF) 身份验证的方式（即当 facebook 向您发送短信供您验证时）。这更像是他们给你一个不完整的模板，除非你声明并设置这个变量（以及其他诸如实现showTextInputPrompt），否则它不会编译。

firebase 文档中提供的代码只是一个示例，因此不要指望它可以开箱即用。