Question

我使用Firebase来处理我的用户注册并登录我的应用。但是如果我登录，然后完全关闭我的应用程序 - 用户被迫重新登录。我想让用户保持登录状态，除非他们点击＆＃34;退出＆＃34;

我的登录代码是：

        Auth.auth().signIn(withEmail: email, password: password, completion: {(user, error) in
            if let firebaseError = error {
                print(firebaseError.localizedDescription)
                return
            }
            self.presentTabBar()
        })
    }
}

除非明确告知退出，否则如何让该用户登录？

Answer 1

这是2020年的一个完整示例：

在iOS + Firebase应用中的任何地方，您都可以简单地说：

guard let uid = Auth.auth().currentUser?.uid else {
    return print("no current user!")
}

因此，在应用程序的启动屏幕上，只需：

import UIKit
import Firebase
import FirebaseUI

class ViewController: UIViewController, FUIAuthDelegate {

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        guard let uid = Auth.auth().currentUser?.uid else {
            return print("no current user, hence AuthUI flow...")
            basicAuthUIFlow()
        }
        print("User .. \(Auth.auth().currentUser?.displayName)")
        continueWhenUserPresent()
    }

就这么简单。所以像往常一样...

    private func basicAuthUIFlow() {
        let authUI = FUIAuth.defaultAuthUI()
        authUI?.delegate = self
        let pp: [FUIAuthProvider] = [ FUIGoogleAuth() ]
        authUI?.providers = pp
        if let authVC = authUI?.authViewController() {
            present(authVC, animated: true)
        }
    }

    func authUI(_ authUI: FUIAuth,
      didSignInWith authDataResult: AuthDataResult?,url: URL?, error: Error?) {
        let u = authDataResult?.user
        print("Successful login via authUI \(String(describing: u?.displayName))")
        continueWhenUserPresent()
    }

    private func continueWhenUserPresent() {
        .. pushViewController .. your first screen
    }

Answer 2

检查用户是否已登录：

if Auth.auth().currentUser != nil {
 // User is signed in.
 // ...
} else {
  // No user is signed in.
 // ...
}

如果用户已登录，则转到主页ViewController。这样当他再次打开应用程序时，他将转到主页ViewController，除非他退出FIRAuth.auth().signOut()

有关详情，请查看：https://firebase.google.com/docs/auth/ios/manage-users

Answer 3

要保持用户登录，您需要检查currentUser Auth会话，如果它不是nil，那么您可以将用户重定向到主屏幕。

致电＆＃34; setRootViewController ＆＃34;来自 didFinishLaunchingWithOptions 的方法，就在FirebaseApp.configure（）代码

之后

Swift 4

    func setRootViewController() {
        if Auth.auth().currentUser != nil {
            // Set Your home view controller Here as root View Controller
            self.presentTabBar()
        } else {
            // Set you login view controller here as root view controller
        }
    }

Firebase登录持久性Swift

3 个答案: