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在iOS上使用Facebook登錄進行身份驗證

通過將Facebook Login集成到您的應用中，您可以讓用戶使用其Facebook帳戶向Firebase進行身份驗證。

在你開始之前

  1. 將Firebase添加到您的iOS項目 。在Podfile包括以下Pod：
    pod 'Firebase/Auth'
  2. 如果您尚未將應用程序連接到Firebase項目，請從Firebase控制台進行 。
  3. 在Facebook for Developers網站上，獲取您的應用程序的應用程序ID和應用程序密鑰 。
  4. 啟用Facebook登錄：
    1. 在Firebase控制台中 ，打開“ 身份驗證”部分。
    2. 在“ 登錄方法”選項卡上，啟用Facebook登錄方法，並指定從Facebook獲得的App ID和App Secret 。
    3. 然後，確保您的OAuth重定向URI （例如， my-app-12345.firebaseapp.com/__/auth/handler ）在產品的Facebook for Developers網站上的Facebook應用的設置頁面中列為OAuth重定向URI之一。 設置> Facebook登錄配置。

使用Firebase進行身份驗證

  1. 按照開發人員的文檔將Facebook Login集成到您的應用程序中。初始化FBSDKLoginButton對象時，請設置一個委託以接收登錄和註銷事件。例如：

    迅速

    let loginButton = FBSDKLoginButton()
loginButton.delegate = self

    目標C 

    FBSDKLoginButton *loginButton = [[FBSDKLoginButton alloc] init];
loginButton.delegate = self;
    在您的委託中，執行didCompleteWithResult:error:

    迅速

    func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) {
  if let error = error {
    print(error.localizedDescription)
    return
  }
  // ...
}

    目標C 

    - (void)loginButton:(FBSDKLoginButton *)loginButton
    didCompleteWithResult:(FBSDKLoginManagerLoginResult *)result
                    error:(NSError *)error {
  if (error == nil) {
    // ...
  } else {
    NSLog(error.localizedDescription);
  }
}
  2. 將Firebase模塊導入UIApplicationDelegate ：

    迅速

    import Firebase

    目標C 

    @import Firebase;
  3. 配置FirebaseApp共享實例，通常在應用程序的application:didFinishLaunchingWithOptions:方法中：

    迅速

    // Use Firebase library to configure APIs
FirebaseApp.configure()

    目標C 

    // Use Firebase library to configure APIs
[FIRApp configure];
  4. 用戶成功didCompleteWithResult:error:後，在您的didCompleteWithResult:error:實現中，獲取登錄用戶的訪問令牌並將其交換為Firebase憑證：

    迅速

    let credential = FacebookAuthProvider.credential(withAccessToken: AccessToken.current!.tokenString)

    物鏡

    FIRAuthCredential *credential = [FIRFacebookAuthProvider
    credentialWithAccessToken:[FBSDKAccessToken currentAccessToken].tokenString];
  5. 最後，使用Firebase憑據向Firebase進行身份驗證：

    迅速

    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 {
      self.showMessagePrompt(error.localizedDescription)
      return
    }
    // ...
    return
  }
  // User is signed in
  // ...
}

    目標C 

    [[FIRAuth auth] signInWithCredential:credential
                          completion:^(FIRAuthDataResult * _Nullable authResult,
                                       NSError * _Nullable error) {
    if (isMFAEnabled && error && error.code == FIRAuthErrorCodeSecondFactorRequired) {
      FIRMultiFactorResolver *resolver = error.userInfo[FIRAuthErrorUserInfoMultiFactorResolverKey];
      NSMutableString *displayNameString = [NSMutableString string];
      for (FIRMultiFactorInfo *tmpFactorInfo in resolver.hints) {
        [displayNameString appendString:tmpFactorInfo.displayName];
        [displayNameString appendString:@" "];
      }
      [self showTextInputPromptWithMessage:[NSString stringWithFormat:@"Select factor to sign in\n%@", displayNameString]
                           completionBlock:^(BOOL userPressedOK, NSString *_Nullable displayName) {
       FIRPhoneMultiFactorInfo* selectedHint;
       for (FIRMultiFactorInfo *tmpFactorInfo in resolver.hints) {
         if ([displayName isEqualToString:tmpFactorInfo.displayName]) {
           selectedHint = (FIRPhoneMultiFactorInfo *)tmpFactorInfo;
         }
       }
       [FIRPhoneAuthProvider.provider
        verifyPhoneNumberWithMultiFactorInfo:selectedHint
        UIDelegate:nil
        multiFactorSession:resolver.session
        completion:^(NSString * _Nullable verificationID, NSError * _Nullable error) {
          if (error) {
            [self showMessagePrompt:error.localizedDescription];
          } else {
            [self showTextInputPromptWithMessage:[NSString stringWithFormat:@"Verification code for %@", selectedHint.displayName]
                                 completionBlock:^(BOOL userPressedOK, NSString *_Nullable verificationCode) {
             FIRPhoneAuthCredential *credential =
                 [[FIRPhoneAuthProvider provider] credentialWithVerificationID:verificationID
                                                              verificationCode:verificationCode];
             FIRMultiFactorAssertion *assertion = [FIRPhoneMultiFactorGenerator assertionWithCredential:credential];
             [resolver resolveSignInWithAssertion:assertion completion:^(FIRAuthDataResult * _Nullable authResult, NSError * _Nullable error) {
               if (error) {
                 [self showMessagePrompt:error.localizedDescription];
               } else {
                 NSLog(@"Multi factor finanlize sign in succeeded.");
               }
             }];
           }];
          }
        }];
     }];
    }
  else if (error) {
    // ...
    return;
  }
  // User successfully signed in. Get user data from the FIRUser object
  if (authResult == nil) { return; }
  FIRUser *user = authResult.user;
  // ...
}];

下一步

用戶首次登錄後，將創建一個新的用戶帳戶並將其鏈接到該用戶登錄的憑據（即用戶名和密碼，電話號碼或身份驗證提供者信息）。此新帳戶存儲為Firebase項目的一部分，可用於在項目中的每個應用程序中識別用戶，而無論用戶如何登錄。

  • 在您的應用程序中，您可以從FIRUser對象獲取用戶的基本配置文件信息。請參閱管理用戶 。

  • 在Firebase實時數據庫和雲存儲安全規則中 ，您可以從auth變量中獲取登錄用戶的唯一用戶ID，並使用它來控制用戶可以訪問哪些數據。

通過將身份驗證提供程序憑據鏈接到現有用戶帳戶，可以允許用戶使用多個身份驗證提供程序登錄您的應用程序。

要註銷用戶，請致電signOut:

迅速

第149章

物鏡

    NSError *signOutError;
BOOL status = [[FIRAuth auth] signOut:&signOutError];
if (!status) {
  NSLog(@"Error signing out: %@", signOutError);
  return;
}

您可能還想為所有身份驗證錯誤添加錯誤處理代碼。請參閱處理錯誤 。