【Swift】Firebase Authを使って爆速でログイン機能を作るためのスニペット

firebaseでユーザー登録・ログイン機能を爆速で作るsnippetです。

ユーザー登録

●Firebaseの公式ドキュメントはこちら
https://firebase.google.com/docs/auth/web/manage-users?hl=ja

RegisterViewController.swift

import UIKit
import Firebase

class RegisterViewController: UIViewController {

    @IBOutlet weak var emailTextfield: UITextField!
    @IBOutlet weak var passwordTextfield: UITextField!
    
    @IBAction func registerPressed(_ sender: UIButton) {
        //ユーザーを生成
        if let email = emailTextfield.text, let password = passwordTextfield.text {
            Auth.auth().createUser(withEmail: email, password: password) { authResult, error in
                if let e = error {
                    //エラー分をローカルの言語で表示
                    print(e.localizedDescription)
                } else {
                    //ログイン後の画面に遷移
                    self.performSegue(withIdentifier: "segue identifier" , sender: self)
                }
            }
          
        }
        
    }
    
}

ログイン

LoginViewController.swift

import UIKit
import Firebase

class LoginViewController: UIViewController {

    @IBOutlet weak var emailTextfield: UITextField!
    @IBOutlet weak var passwordTextfield: UITextField!
    

    @IBAction func loginPressed(_ sender: UIButton) {
        //ユーザー認証
        if let email = emailTextfield.text, let password = passwordTextfield.text {
            Auth.auth().signIn(withEmail: email, password: password) { authResult, error in
                if let e = error {
                    print(e.localizedDescription)
                } else {
                    self.performSegue(withIdentifier: "segue identifier", sender: self)
                }
              // ...
            }
        }
        
    }
    
}

ログアウト

LogoutViewController.swift

import Firebase
//中略

@IBAction func logOutPressed(_ sender: UIBarButtonItem) {
        
            let firebaseAuth = Auth.auth()
        do {
          try firebaseAuth.signOut()
            //navigationControllerの先頭に遷移させる
            navigationController?.popToRootViewController(animated: true)
            
        } catch let signOutError as NSError {
          print ("Error signing out: %@", signOutError)
        }
        
    }