以编程方式管理多iOS身份验证Firebase - Swift

pod init
pod 'Firebase/Auth'

pod install

import Foundation
import Firebase

class AuthManager: NSObject {
    static let shared = AuthManager()
    private override init() {}
    
    func initializeFirebase() {
        FirebaseApp.configure()
    }
}

import UIKit
import Firebase

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        AuthManager.shared.initializeFirebase()
        return true
    }
}

import UIKit
import Firebase

class SignInViewController: UIViewController {
    @IBOutlet weak var emailTextField: UITextField!
    @IBOutlet weak var passwordTextField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func signInButtonTapped(_ sender: UIButton) {
        guard let email = emailTextField.text, !email.isEmpty,
              let password = passwordTextField.text, !password.isEmpty else { return }
        
        Auth.auth().signIn(withEmail: email, password: password) { [weak self] authResult, error in
            if let error = error {
                print("Error signing in: \(error.localizedDescription)")
                return
            }
            
            self?.performSegue(withIdentifier: "goToHome", sender: self)
        }
    }

    @IBAction func signUpButtonTapped(_ sender: UIButton) {
        guard let email = emailTextField.text, !email.isEmpty,
              let password = passwordTextField.text, !password.isEmpty else { return }
        
        Auth.auth().createUser(withEmail: email, password: password) { [weak self] authResult, error in
            if let error = error {
                print("Error signing up: \(error.localizedDescription)")
                return
            }
            
            self?.performSegue(withIdentifier: "goToHome", sender: self)
        }
    }
}

func switchUser(email: String, password: String) {
    Auth.auth().signOut { error in
        if let error = error {
            print("Error signing out: \(error.localizedDescription)")
            return
        }
        
        Auth.auth().signIn(withEmail: email, password: password) { [weak self] authResult, error in
            if let error = error {
                print("Error signing in: \(error.localizedDescription)")
                return
            }
            
            self?.performSegue(withIdentifier: "goToHome", sender: self)
        }
    }
}