如何在具有自定义选项卡UI的UITabBarController中删除“更多”选项卡(不使用选项卡栏)

class CustomTabBarController: UITabBarController, UITabBarDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 获取UITabBar实例
        if let tabBar = self.tabBar {
            tabBar.delegate = self
        }
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        // 移除“更多”选项卡对应的UIViewController
        if let moreNavigationController = self.moreNavigationController {
            if let viewControllers = moreNavigationController.viewControllers {
                moreNavigationController.viewControllers = viewControllers.filter { $0 != moreNavigationController.topViewController }
            }
        }
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        // 重新布局UITabBar的选项卡位置
        if let tabBar = self.tabBar {
            tabBar.setNeedsLayout()
        }
    }
    
    // UITabBarDelegate方法
    func tabBar(_ tabBar: UITabBar, shouldSelect item: UITabBarItem) -> Bool {
        // 如果选中的是“更多”选项卡，则返回false
        if item == moreNavigationController?.tabBarItem {
            return false
        }
        return true
    }
}