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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-Day15】透過 Firebase 來管理使用者 (Sign in with E-mail 篇) Part1 這篇會來教大家如何透過 Firebase 在你的 iOS App 上實作註冊以及登入功能 透過 Firebase 在你的 iOS App 上實作登出以及密碼重設功能會放在下一篇喔 # 前置作業 打開專案的 Podfile,新增 Firebase/Auth ``` pod 'Firebase/Auth' ``` ![](https://i.imgur.com/36LNSG8.png) ``` pod install ``` ![](https://i.imgur.com/NGJyXEH.png) 接著到該專案的 Firebase Console 裡點左側的「Authentication」,再點「Sign-in method」,將「電子郵件/密碼」這個選項開啟 ![](https://i.imgur.com/FPecr56.png) # 開始實作囉 打開 `專案名稱.xcworkspace`,然後在你需要用到的檔案引入 Firebase ```swift= import Firebase import FirebaseAuth ``` 首先先將帳號跟密碼的 TextField、帳號登入的 Button 的 IBOutlet 拉好 以及宣告一個變數 isSignIn,型別為 Bool,初始值為 false,用來判斷是否已經登入 ```swift= @IBOutlet weak var accountTF: UITextField! @IBOutlet weak var passwordTF: UITextField! @IBOutlet weak var signInOrSignOutBtn: UIButton! var isSignIn: Bool = false ``` 然後在註冊帳號按鈕的 IBAction 加入下面這段 我們先判斷是否任一帳號欄位為空,為空的話,就通知說「請輸入帳號!」 不為空的話,就透過 Firebase 提供的 createUser() API,來實作註冊帳號功能 ```swift= @IBAction func registerAccount(_ sender: UIButton) { if (accountTF.text == "") { CustomFunc.customAlert(title: "請輸入帳號!", message: "", vc: self, actionHandler: nil) } else { Auth.auth().createUser(withEmail:accountTF.text!, password: passwordTF.text!) { (user, error) in if (error == nil) { CustomFunc.customAlert(title: "帳號已成功建立!", message: "", vc: self, actionHandler: nil) } else { CustomFunc.customAlert(title: "", message: "\(String(describing: error!.localizedDescription))", vc: self, actionHandler: nil) } } } } ``` 註冊完之後,就可以在 Firebase Console 裡看到剛剛我們註冊的帳號了 ![](https://i.imgur.com/4dkloxE.png) 接著在帳號登入按鈕的 IBAction 加入下面這段 我們先判斷目前是否有使用者存在 假設有的話,就執行帳號登出功能,沒有的話,就執行帳號登入功能,這裡我們先實作帳號登入功能 接著我們先判斷是否任一帳號密碼欄位為空,為空的話,就通知說「請重新輸入帳號密碼!」 不為空的話,就透過 Firebase 提供的 signIn() API,來實作帳號登入功能 ```swift= @IBAction func accountSignInOrSignOut(_ sender: UIButton) { if (Auth.auth().currentUser == nil || !isSignIn) { // 無用戶登入 if (accountTF.text == "" || passwordTF.text == "") { CustomFunc.customAlert(title: "請重新輸入帳號密碼!", message: "", vc: self, actionHandler: nil) } else { Auth.auth().signIn(withEmail:accountTF.text!, password: passwordTF.text!) { (user, 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.accountTF.text = "" self.passwordTF.text = "" self.isSignIn = true self.signInOrSignOutBtn.setTitle("帳號登出", for: .normal) } } } else { // 有用戶登入 // 登出功能,下一篇才會教喔! } } ``` 帳號登出、密碼重設功能就留到明天再說囉~ 本篇的參考範例程式碼:[Github](https://github.com/leoho0722/IT2021/blob/main/Day15~Day22%E3%80%81Day24~Day28/CocoaPodsDemo/CocoaPodsDemo/FirebaseVC/EmailVC/EmailVC.swift)

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