双击UITabBarController时防止自动popToRootViewController

class CustomTabBarController: UITabBarController {
    override func viewDidLoad() {
        super.viewDidLoad()
        let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleTap))
        tapGestureRecognizer.numberOfTapsRequired = 2
        view.addGestureRecognizer(tapGestureRecognizer)
    }
    
    @objc func handleTap(sender: UITapGestureRecognizer) {
        guard let selectedViewController = selectedViewController else { return }
        guard let navigationController = selectedViewController as? UINavigationController else { return }
        guard let viewControllers = navigationController.viewControllers else { return }
        
        let targetViewController = viewControllers.first(where: { $0 is YourTargetViewController })
        
        if let targetViewController = targetViewController {
            navigationController.popToViewController(targetViewController, animated: true)
        }
    }
}