如何让自定义导航控制器为每个情节提要提供相同的自定义navBar按钮

import UIKit

class CustomNavigationController: UINavigationController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置导航栏的外观
        self.navigationBar.barTintColor = UIColor.blue
        self.navigationBar.tintColor = UIColor.white
        self.navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white]
        
        // 设置导航栏按钮
        let customButton = UIBarButtonItem(title: "Custom", style: .plain, target: self, action: #selector(customButtonTapped))
        self.navigationItem.rightBarButtonItem = customButton
    }
    
    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        super.pushViewController(viewController, animated: animated)
        
        // 设置每个情节的导航栏按钮
        let customButton = UIBarButtonItem(title: "Custom", style: .plain, target: self, action: #selector(customButtonTapped))
        viewController.navigationItem.rightBarButtonItem = customButton
    }
    
    @objc func customButtonTapped() {
        // 处理导航栏按钮的点击事件
        print("Custom button tapped")
    }
}

let customNavController = CustomNavigationController(rootViewController: initialViewController)
self.window?.rootViewController = customNavController
self.window?.makeKeyAndVisible()