swift - FirebaseAuth with Swift 不起作用（显示一个空白的 Welcome VC）

Question

我有一个奇怪的问题。当我尝试使用 FirebaseAuth / FirebaseUI 时，我无法显示任何身份验证选项并且只能获得一个空白的 ViewController

有谁知道我做错了什么？顺便提一句。电子邮件身份验证已启用。:)

Login ViewController

import UIKit
import FirebaseAuth
import FirebaseUI


typealias FIRUser = FirebaseAuth.User

class LoginViewController: UIViewController, UITextFieldDelegate {


// MARK: Properties

@IBOutlet weak var logInandSignUp: UIButton!


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


    override func viewWillAppear(_ animated: Bool) {
       }


// MARK: Actions

    @IBAction func loginButtonTapped(_ sender: UIButton) {
        print("Login Button tapped")





             // 1 access the FUIAuth default auth UI singleton
             guard let authUI = FUIAuth.defaultAuthUI()
                 else { return }

             // 2 set FUIAuth's singleton delegate
             authUI.delegate = self

             // 3 present the auth view controller
             let authViewController = authUI.authViewController()
             present(authViewController, animated: true, completion: nil)


    }

}



extension LoginViewController: FUIAuthDelegate {
    func authUI(_ authUI: FUIAuth, didSignInWith authDataResult: AuthDataResult?, error: Error?) {

        let user = User.current

        if let error = error {

            assertionFailure("Error signing in: \(error.localizedDescription)")
            return
        }

        UserService.show(forUID: user.uid) { (user) in
                if let user = user {
                    // handle existing user
                    User.setCurrent(user)

                    let initialViewController = UIStoryboard.initialViewController(for: .main)
                    self.view.window?.rootViewController = initialViewController
                    self.view.window?.makeKeyAndVisible()

                } else {
                    // handle new user
                    self.performSegue(withIdentifier: Constants.Segue.toCreateUsername, sender: self)
                }
            }
        }
    }

用户服务.swift：

import Foundation
import FirebaseAuth.FIRUser
import FirebaseDatabase
import FirebaseUI
import FirebaseAuth

struct UserService {



    static func create(_ firUser: FIRUser, username: String, completion: @escaping (User?) -> Void) {

       let userAttrs = ["username": username]

        let ref = Database.database().reference().child("Leader").child(firUser.uid)
        ref.setValue(userAttrs) { (error, ref) in
            if let error = error {
                assertionFailure(error.localizedDescription)
                return completion(nil)
            }

            ref.observeSingleEvent(of: .value, with: { (snapshot) in
                let user = User(snapshot: snapshot)
                completion(user)
            })
        }
    }
    static func show(forUID uid: String, completion: @escaping (User?) -> Void) {
           let ref = Database.database().reference().child("users").child(uid)
           ref.observeSingleEvent(of: .value, with: { (snapshot) in
               guard let user = User(snapshot: snapshot) else {
                   return completion(nil)
               }

               completion(user)
           })
       }

}

用户.swift

import Foundation
import FirebaseDatabase.FIRDataSnapshot

class User {

    // MARK: - Properties

    let uid: String
    let username: String

    // MARK: - Init

    init(uid: String, username: String) {
        self.uid = uid
        self.username = username
    }
    init?(snapshot: DataSnapshot) {
    guard let dict = snapshot.value as? [String : Any],
        let username = dict["username"] as? String
        else { return nil }

    self.uid = snapshot.key
    self.username = username
    }

    // MARK: - Singleton

    // Now that we've created a User singleton, we need to make sure to set it. Once we receive the user from the database, we set the singleton with our custom setter method. After the singleton is set, it will remain in memory for the rest of the app's lifecycle. It will be accessible from any view controller with the following code: let user = User.current


    // 1 Create a private static variable to hold our current user.
    private static var _current: User?

    // 2 Create a computed variable that only has a getter that can access the private _current variable.
    static var current: User {
        // 3 Check that _current that is of type User? isn't nil. If _current is nil --> fatalError().

        guard let currentUser = _current else {
            fatalError("Error: current user doesn't exist")
        }

        // 4 If _current isn't nil, it will be returned to the user.
        return currentUser
    }

    // MARK: - Class Methods

    // 5 Create a custom setter method to set the current user.

    static func setCurrent(_ user: User) {
        _current = user
    }

}

希望任何人都可以帮助我。真的不明白是什么问题。

标签： swiftxcodefirebasefirebase-authentication