如何将注销按钮添加到我的UITabBar

import UIKit

class CustomTabBarController: UITabBarController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 调用添加注销按钮的方法
        addLogoutButton()
    }
    
    func addLogoutButton() {
        // 创建注销按钮
        let logoutButton = UIButton(type: .system)
        logoutButton.setImage(UIImage(named: "logout_icon"), for: .normal)
        logoutButton.setTitle("注销", for: .normal)
        logoutButton.titleLabel?.font = UIFont.systemFont(ofSize: 12)
        logoutButton.setTitleColor(.black, for: .normal)
        
        // 设置按钮位置和大小
        logoutButton.frame = CGRect(x: tabBar.bounds.width - 70, y: 0, width: 70, height: tabBar.bounds.height)
        
        // 添加按钮点击事件监听器
        logoutButton.addTarget(self, action: #selector(logoutButtonTapped), for: .touchUpInside)
        
        // 将按钮添加到UITabBar的视图层级中
        tabBar.addSubview(logoutButton)
    }
    
    @objc func logoutButtonTapped() {
        // 执行注销操作
        // ...
    }
}