Firebaseに「既存のメール」エラーが表示される

Question

Facebookを使用してFirebaseアカウントにログインできるようにする方法を設定しようとしています。アカウントを初めて作成するユーザーであれば、すべて正常に動作しますが、ユーザーが以前にアカウントを作成してアカウントにログインしようとすると、問題が始まる場所になります。ときにコード

FIRAuth.auth()?.signIn(with: credential, completion: {(user, error) 

ランは、私はそれは彼らがサインインしようとしているアカウントであっても、メールが既に使用中であるというエラーを取得します。

私の全体のコードはここにある：

func handleCustomFBLogin() { 
    FBSDKLoginManager().logIn(withReadPermissions: ["email"], from: self) { (result, err) in 
     if err != nil { 
      print("Error loggin in is \(err)") 
      //self.facebookanimateIn() 
     } else if (result?.isCancelled)!{ 
      print("The user cancelled loggin in ") 
     } else { 
      let credential = FIRFacebookAuthProvider.credential(withAccessToken: FBSDKAccessToken.current().tokenString) 
          let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, email"]) 
      graphRequest.start(completionHandler: { (connection, result, error) -> Void in 
       if ((error) != nil) { 
        print("Error: \(error)") 
       } else { 

        let data:[String:AnyObject] = result as! [String: AnyObject] 
        let facebookName:NSString = data["name"] as! NSString 

        let facebookEmail = data["email"] as Any 

        let userId = data["id"] as! NSString 
        let facebookProfileUrl = "http://graph.facebook.com/\(userId)/picture?type=large" 
        let facebookAge = data["age_range"] as Any 
        let password = "needToPutRandomizedPasswordInHere" as String 
        FIRAuth.auth()?.createUser(withEmail: facebookEmail as! String, password: password, completion: {result, error in 
         if error != nil{ 
          //user has account, they just need to sign in 
          FIRAuth.auth()?.signIn(with: credential, completion: {(user, error) in 
           if error != nil{ 
            print(error.debugDescription) 
            return 
           } 

           let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle:nil) 
           let vc: UINavigationController = storyboard.instantiateViewController(withIdentifier: "checker") as! UINavigationController 
           self.present(vc, animated: true, completion: nil) 
           // ref.removeObserver(withHandle: handle) 
          }) 
         } else { 
          //user does not have an account and they need to create one 
          guard let uid = result?.uid else{ 
           return 
          } 
          print("user created as \(uid)") 
          let val = "0" 
          let number = (val as NSString).integerValue 
          let ref = FIRDatabase.database().reference() 
          let usersReference = ref.child("Users").child(uid) 
          let values = [""] as [String : Any]; 
          usersReference.updateChildValues(values, withCompletionBlock: { (err,ref) in 
           if err != nil { 
            print(err.debugDescription) 
            return}}) 
          print("Save the user successfully into Firebase database") 
          let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle:nil) 
          let vc: UINavigationController = storyboard.instantiateViewController(withIdentifier: "checker") as! UINavigationController 
          self.present(vc, animated: true, completion: nil) 


         } 
        }) 
       } 
      }) 
     } 
    } 
} 

Answer 1

ユーザーを作成したら、あなたが必要とするすべてのログイン手順

FIRAuth.auth()?.signIn(withEmail: email, password: password, completion: { (user, error) in 
     if error != nil { 
      // handle errors 
     } else { 
      // continue with login process 
     } 
    })