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

Posted 2023-02-23

【中文标题】Firebase google 登录身份验证 AppDelegate-使用未解析的标识符“isMFAEnabled”

【英文标题】：Firebase google signin authentication AppDelegate- Use of unresolved identifier 'isMFAEnabled'

【发布时间】：2020-10-18 19:11:17

【问题描述】：

我是 ios 开发新手。我正在尝试将谷歌登录添加到我的应用程序中，但我遇到了一些问题。代码显示一些“使用未解析的标识符'isMFAEnabled”和“'AppDelegate' 类型的值没有成员'showTextInputPrompt'”。请帮助我。我正在关注这个文档-https://firebase.google.com/docs/auth/ios/google-signin#swift_9enter image description here

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)
        

【问题讨论】：

你在哪里定义isMFAEnabled？

你在那里使用它，但你根本没有声明变量。这就是该消息试图告诉您的内容。

你解决了吗，我也卡住了

所以真正的问题是我们在哪里可以找到完整的示例源代码...

【参考方案1】：

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

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

open,options 看起来不错。

didSignInFor user 是纠结的地方。删除整个函数并将其替换为以下扩展名（在类的括号外）：

（同时删除类协议中的GIDSignInDelegate）

    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，它目前正在运行 (Swift 5/ios 13.6)。

【参考方案2】：

TL;DR;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，以供您启用/禁用多因素 (MF) 身份验证（即当 facebook 向您发送短信以供您验证时）。更像是他们给了你一个不完整的模板，除非你声明和设置这个变量（以及其他东西，比如实现showTextInputPrompt），否则它不会编译。

firebase 文档中提供的代码是一个示例，所以不要指望它开箱即用。

【讨论】：

等等...为什么要删除isMFAEnabled？有什么重要性？

是的，它是 Firebase 提供的示例的一部分。它指示您是否要启用多因素身份验证。如果您希望它始终启用，您可以简单地忽略它

谢谢！更新了您的答案并进行了一些澄清。