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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-Day16】透過 Firebase 來管理使用者 (Sign in with E-mail 篇) Part2 昨天我們已經將註冊帳號、帳號登入實作完成了,今天我們要來把剩下的帳號登出以及密碼重設功能來實作完成 ### 這是我們昨天完成的帳號登入功能 ```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! } } ``` ### 這是我們今天要完成的帳號登出、密碼重設功能 今天我們要來繼續把帳號登出也就是 else 的部分完成 在 else 裡面加入下面這段,透過 Firebase 提供的 signOut() API,我們可以很輕鬆的實作帳號登出功能 ```swift= // 有用戶登入 do { try Auth.auth().signOut() CustomFunc.customAlert(title: "登出成功!", message: "", vc: self, actionHandler: nil) self.accountTF.text = "" self.passwordTF.text = "" self.isSignIn = false self.signInOrSignOutBtn.setTitle("帳號登入", for: .normal) } catch let error as NSError { CustomFunc.customAlert(title: "", message: "\(String(describing: error.localizedDescription))", vc: self, actionHandler: nil) } ``` 接著是密碼重設功能,在密碼重設按鈕的 IBAction 加入下面這段 透過 Firebase 提供的 sendPasswordReset() API,我們可以很輕鬆的實作密碼重設功能 ```swift= @IBAction func resetPassword(_ sender: UIButton) { if (accountTF.text == "") { CustomFunc.customAlert(title: "", message: "請輸入要重設密碼的 Email!", vc: self, actionHandler: nil) } else { Auth.auth().sendPasswordReset(withEmail: accountTF.text!, completion: { (error) in guard error == nil else { CustomFunc.customAlert(title: "", message: "\(String(describing: error!.localizedDescription))", vc: self, actionHandler: nil) return } CustomFunc.customAlert(title: "", message: "重設密碼的連結已寄到信箱內,請點擊信中的連結進行密碼重設!", vc: self, actionHandler: nil) }) } } ``` 密碼重設的信件如下圖 ![](https://i.imgur.com/loKxFch.png) 密碼重設的畫面如下圖 ![](https://i.imgur.com/XmwwCwI.png) 再來是我們要如何知道,目前是否有使用者登入,我們可以透過加入帳號狀態監聽的方式來達成 先宣告一個變數 handle,型別為「AuthStateDidChangeListenerHandle?」,因為在沒有使用者的狀態下會為 nil,所以在型別的後面要加個「?」來告知說,此變數有可能會有空值的狀況 ```swift= var handle: AuthStateDidChangeListenerHandle? ``` 然後在 viewWillAppear 裡面加入帳號狀態監聽的 Function,當畫面將要出現的時候,就開始監聽 ```swift= // MARK: - 加入 Firebase 帳號狀態監聽 override func viewWillAppear(_ animated: Bool) { super.viewWillAppear(animated) handle = Auth.auth().addStateDidChangeListener { auth, user in if (user != nil) { if (self.isSignIn) { print("目前已有使用者登入!") self.signInOrSignOutBtn.setTitle("帳號登出", for: .normal) self.passwordTF.isEnabled = false } else { self.signInOrSignOutBtn.setTitle("帳號登入", for: .normal) self.passwordTF.isEnabled = true } } else { // 目前尚無用戶登入 print("目前尚無用戶登入!") } } } ``` 接著在 viewWillDisappear 裡面加入帳號狀態監聽移除的 Function,當畫面將要消失的時候,就移除監聽 ```swift= // MARK: - 移除 Firebase 帳號狀態監聽 override func viewWillDisappear(_ animated: Bool) { super.viewWillDisappear(animated) Auth.auth().removeStateDidChangeListener(handle!) } ``` 後面兩篇要來教大家,如何透過 Firebase 來實作第三方帳號登入功能 # 成果 {%youtube cJRp46XHhN8 %} 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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