iOS -方向更改时导航栏不显示大标题

override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
    super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    self.navigationController?.delegate = self
}

func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
    if UIDevice.current.orientation.isLandscape {
        navigationController.navigationBar.prefersLargeTitles = false
    } else {
        navigationController.navigationBar.prefersLargeTitles = true
    }
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    setNeedsStatusBarAppearanceUpdate()
}