如何在navigation控制器快速切换时隐藏导航栏

let viewController = YourViewController()
let navigationController = UINavigationController(rootViewController: viewController)

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    navigationController?.setNavigationBarHidden(true, animated: animated)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    navigationController?.setNavigationBarHidden(false, animated: animated)
}