如何在RxSwift中用一个按钮创建SignIn和SignOut？

import UIKit
import RxSwift
import RxCocoa

class SignInViewController: UIViewController {

    @IBOutlet weak var signInButton: UIButton!
    
    let disposeBag = DisposeBag()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建一个按钮点击事件的Observable
        let buttonTapObservable = signInButton.rx.tap.asObservable()
        
        // 创建SignIn和SignOut的Observable
        let signInObservable = buttonTapObservable.filter { [weak self] _ in
            // 这里可以根据你的逻辑来判断是否是SignIn
            return self?.isSignIn == false
        }
        
        let signOutObservable = buttonTapObservable.filter { [weak self] _ in
            // 这里可以根据你的逻辑来判断是否是SignOut
            return self?.isSignIn == true
        }
        
        // 订阅SignIn事件
        signInObservable.subscribe(onNext: { [weak self] in
            self?.signIn()
        }).disposed(by: disposeBag)
        
        // 订阅SignOut事件
        signOutObservable.subscribe(onNext: { [weak self] in
            self?.signOut()
        }).disposed(by: disposeBag)
    }
    
    var isSignIn = false
    
    func signIn() {
        print("SignIn")
        isSignIn = true
        updateButtonTitle()
    }
    
    func signOut() {
        print("SignOut")
        isSignIn = false
        updateButtonTitle()
    }
    
    func updateButtonTitle() {
        signInButton.setTitle(isSignIn ? "Sign Out" : "Sign In", for: .normal)
    }
}