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    ###### tags: `第13屆IT邦鐵人賽文章` # 【在 iOS 開發路上的大小事-Day20】透過 Firebase 來管理使用者 (Sign in with Facebook 篇) Part2 昨天我們已經完成了 Sign in with Facebook 的前置作業了,今天我們要來將功能實作出來 # 畫面設計 我們先在 Storyboard/Xib 上拉出一個 UIButton ![](https://i.imgur.com/j1mbG2u.png) # 程式實作 在要實作 Sign in with Facebook 功能的 Controller 引入下面兩個 ```swift= import FirebaseAuth import FBSDKLoginKit ``` 元件的 IBOutlet 如下 ```swift= @IBOutlet weak var signInWithFacebookBtn: UIButton! ``` 宣告一個 isSign 變數,型別為 Bool,用來判斷是否已經登入 然後在宣告一個 loginManager 常數,讓他等於 LoginManager(),用來進行登入/登出 ```swift= var isSign: Bool = false // 預設為尚未登入 let loginManager = LoginManager() ``` 接著在登入按鈕的 IBAction 加入下面的程式碼 ```swift= @IBAction func signInWithFacebook(sender: UIButton) { if (self.isSign) { self.facebookAccountSignOut() // 已經登入的話,按下按鈕會執行登出功能 } else { self.signInWithFacebook() // 尚未登入的話,按下按鈕會執行登入功能 } } ``` 按下按鈕登入成功後,Facebook 會回傳使用者的 accessToken 接著就可以用 FacebookAuthProivder.credential() 這個 method 來產生該使用者的憑證 後面就可以透過這個憑證來與 Firebase 串接在一起了 ```swift= extension SignInWithFacebookVC { // MARK: - Firebase Sign in with Facebook // 登入帳號 func signInWithFacebook() { loginManager.logIn(permissions: ["email"], from: self) { loginResult, error in guard error == nil else { CustomFunc.customAlert(title: "", message: "\(String(describing: error!.localizedDescription))", vc: self, actionHandler: nil) return } guard ((loginResult?.isCancelled) != nil) else { CustomFunc.customAlert(title: "Facebook 登入失敗!", message: "", vc: self, actionHandler: nil) return } guard let accessToken = AccessToken.current else { CustomFunc.customAlert(title: "無法取得 AccessToken!", message: "", vc: self, actionHandler: nil) return } let credential = FacebookAuthProvider.credential(withAccessToken: accessToken.tokenString) self.firebaseSignInWithFacebook(credential: credential) } } func firebaseSignInWithFacebook(credential: AuthCredential) { Auth.auth().signIn(with: credential) { authResult, error in guard error == nil else { CustomFunc.customAlert(title: "", message: "\(String(describing: error!.localizedDescription))", vc: self, actionHandler: nil) return } CustomFunc.customAlert(title: "登入成功!", message: "", vc: self, actionHandler: self.getFirebaseUserInfo) self.signInWithFacebookBtn.setTitle("Facebook Account Sign Out", for: .normal) self.isSignIn = true } } // 登出帳號 func facebookAccountSignOut() { do { try Auth.auth().signOut() loginManager.logOut() CustomFunc.customAlert(title: "帳號已登出!", message: "", vc: self, actionHandler: nil) self.signInWithFacebookBtn.setTitle("Connect with Facebook", for: .normal) self.isSignIn = false } catch let error as NSError { CustomFunc.customAlert(title: "", message: "\(String(describing: error.localizedDescription))", vc: self, actionHandler: nil) } } } ``` 如果要判斷目前是否已經有使用者登入了,可以在 viewWillAppear 加入判斷 ```swift= // MARK: - 加入 Firebase 帳號狀態監聽 override func viewWillAppear(_ animated: Bool) { super.viewWillAppear(animated) if let token = AccessToken.current, !token.isExpired { CustomFunc.customAlert(title: "帳號已登入過!", message: "", vc: self, actionHandler: self.getFirebaseUserInfo) self.signInWithFacebookBtn.setTitle("Sign Out", for: .normal) self.isSignIn = true } else { // 目前尚無用戶登入 print("目前尚無用戶登入!") } } ``` 要讀取目前登入使用者的資料,可以這樣來讀取 ```swift= // MARK: - Firebase 取得登入使用者的資訊 func getFirebaseUserInfo() { let currentUser = Auth.auth().currentUser guard let user = currentUser else { CustomFunc.customAlert(title: "使用者資訊", message: "無法取得使用者資料", vc: self, actionHandler: nil) return } let uid = user.uid let email = user.email let name = user.displayName CustomFunc.customAlert(title: "使用者資訊", message: "User Name:\(name!)\nUID:\(uid)\nEmail:\(email!)", vc: self, actionHandler: nil) } ``` # 成果 {%youtube DvKLIZOOQ-4 %} 本篇的範例程式碼:[Github](https://github.com/leoho0722/IT2021/blob/main/Day15~Day22%E3%80%81Day24~Day28/CocoaPodsDemo/CocoaPodsDemo/FirebaseVC/SignInWithFacebookVC/SignInWithFacebookVC.swift)

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