Google SDK更新后GIDGoogleUser相关错误求助（iOS Swift）

问题背景 #

跟着旧YouTube教程开发即时通讯应用，因Google Sign-In SDK版本更新，代码出现两个明确错误：

1. Instance member 'profile' cannot be used on type 'GIDGoogleUser'
2. Value of type 'GIDGoogleUser' has no member 'authentication'

错误原因及修复方案 #

错误1修复：移除不必要的可选链调用 #

代码中user?.profile?.givenName一行存在逻辑问题：前面已经通过guard let user = result?.user将user绑定为非可选实例，无需再用user?的可选链调用，直接使用user.profile即可。

修改前后对比：

• 错误代码：

  guard let email = user.profile?.email,
        let firstName = user?.profile?.givenName,
        let lastName = user?.profile?.familyName else {
      return
  }
  

• 修复后：

  guard let email = user.profile?.email,
        let firstName = user.profile?.givenName,
        let lastName = user.profile?.familyName else {
      return
  }
  

错误2修复：适配新版SDK的认证凭证获取逻辑 #

Google Sign-In 6.x版本彻底移除了GIDGoogleUser的authentication属性，需直接从user对象获取ID Token和Access Token：

原错误代码：

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

修复后代码：

guard let idToken = user.idToken?.tokenString,
      let accessToken = user.accessToken.tokenString else {
    return
}
let credential = GoogleAuthProvider.credential(withIDToken: idToken,
                                               accessToken: accessToken)

完整修复后的googleButtonTapped方法 #

@objc func googleButtonTapped() {
    guard let clientID = FirebaseApp.app()?.options.clientID else { return }
    let config = GIDConfiguration(clientID: clientID)
    GIDSignIn.sharedInstance.configuration = config
    
    GIDSignIn.sharedInstance.signIn(withPresenting: self) { result, error in
        guard error == nil else {
            print("Fail to sign in with Google: \(error!)")
            return
        }
        
        guard let user = result?.user else {
            return
        }
        
        // 修复错误1：移除不必要的可选链调用
        guard let email = user.profile?.email,
              let firstName = user.profile?.givenName,
              let lastName = user.profile?.familyName else {
            return
        }
        
        UserDefaults.standard.set(email, forKey: "email")
        UserDefaults.standard.set("\(firstName) \(lastName)", forKey: "name")
        
        print("Did sign in with Google: \(user)")
        DatabaseManager.shared.userExists(with: email) { exists in
            if !exists {
                let chatUser = ChatAppUser(firstName: firstName,
                                           lastName: lastName,
                                           emailAddress: email)
                DatabaseManager.shared.insertUser(with: chatUser) { success in
                    if success {
                        guard let userProfile = user.profile else {
                            return
                        }
                        if userProfile.hasImage {
                            guard let url = userProfile.imageURL(withDimension: 200) else {
                                return
                            }
                            
                            URLSession.shared.dataTask(with: url) { data, _, error in
                                guard let data = data else {
                                    return
                                }
                                
                                let fileName = chatUser.profilePictureFileName
                                StorageManager.shared.uploadProfilePicture(with: data,
                                                                           fileName: fileName) { result in
                                    switch result {
                                    case .success(let downloadUrl):
                                        UserDefaults.standard.set(downloadUrl, forKey: "profile_picture_url")
                                        print(downloadUrl)
                                    case .failure(let error):
                                        print("Storage manager error: \(error)")
                                    }
                                }
                            }.resume()
                        }
                    }
                }
            }
        }
        
        // 修复错误2：新版SDK获取认证凭证方式
        guard let idToken = user.idToken?.tokenString,
              let accessToken = user.accessToken.tokenString else {
            return
        }
        let credential = GoogleAuthProvider.credential(withIDToken: idToken,
                                                       accessToken: accessToken)
        
        FirebaseAuth.Auth.auth().signIn(with: credential) { [weak self]authResult, error in
            guard let strongSelf = self else {
                return
            }
            guard authResult != nil, error == nil else {
                print("failed to log in google credential")
                return
            }
            
            print("Successfully signed in google credential.")
            NotificationCenter.default.post(name: .didLogInNotification, object: nil)
            strongSelf.navigationController?.dismiss(animated: true, completion: nil)
        }
    }
}

额外注意事项 #

• 确保你的GoogleSignIn Pod版本为6.x及以上，同时匹配Firebase Auth的最新稳定版本
• 若直接获取ID Token失败，可尝试调用user.getIDToken { token, error in ... }方法异步获取

内容的提问来源于stack exchange，提问作者Andrew