1.

    override func viewDidLoad() {

        super.viewDidLoad()

        self.navigationController?.delegate = self

    }

2. 实现代理方法

// MARK: - 导航栏代理， 只在本页面隐藏 导航栏extension JYStaffListController:UINavigationControllerDelegate{    func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {                if viewController is JYStaffListController{            self.navigationController?.navigationBar.shadowImage = UIImage.init(named: "testImage")        }else{            self.navigationController?.setupNewNav()        }    }}