ios - RealmSwift : Implementing one time login with MongoDB Realm in swift

Question

我希望用户登录一次，而不必在每次打开应用程序时重新输入登录信息，除非他们在上次 session 中注销。
当前每次打开应用程序时都会显示登录屏幕。这是我的 Root View

struct AppRootView: View {

     var body: some View {
        AnyView {
        
        // check if user has already logged in here and then route them accordingly 
        
            if auth.token != nil {
                homeMainView()
            } else {
                LoginController()
            }
        }
    }
}

目前这是我用来登录用户的

 @objc func signUp() {
        setLoading(true);
        app.usernamePasswordProviderClient().registerEmail(username!, password: password!, completion: {[weak self](error) in
            // Completion handlers are not necessarily called on the UI thread.
            // This call to DispatchQueue.main.sync ensures that any changes to the UI,
            // namely disabling the loading indicator and navigating to the next page,
            // are handled on the UI thread:
            DispatchQueue.main.sync {
                self!.setLoading(false);
                guard error == nil else {
                    print("Signup failed: \(error!)")
                    self!.errorLabel.text = "Signup failed: \(error!.localizedDescription)"
                    return
                }
                print("Signup successful!")
                
                // Registering just registers. Now we need to sign in, but we can reuse the existing username and password.
                self!.errorLabel.text = "Signup successful! Signing in..."
                self!.signIn()
            }
        })
    }

    @objc func signIn() {
        print("Log in as user: \(username!)");
        setLoading(true);
        
        app.login(withCredential: AppCredentials(username: username!, password: password!)) { [weak self](maybeUser, error) in
            
            DispatchQueue.main.sync {
                self!.setLoading(false);
                guard error == nil else {
                    // Auth error: user already exists? Try logging in as that user.
                    print("Login failed: \(error!)");
                    self!.errorLabel.text = "Login failed: \(error!.localizedDescription)"
                    return
                }
                
                guard let user = maybeUser else {
                    fatalError("Invalid user object?")
                }

                print("Login succeeded!");
                

//                
                let hostingController = UIHostingController(rootView: ContentView())
                self?.navigationController?.pushViewController(hostingController, animated: true)
            }

如何实现一次登录，以便用户每次打开应用程序时都必须登录？

Answer 1

一个正确配置和初始化的RealmApp类将在应用程序重新启动之间为您保留 session 信息，您可以使用 .currentUser() 检查现有 session 这个类的方法。所以在你的情况下是这样的:

if app.currentUser() != nil {
    homeMainView()
} else {
    LoginController()
}