Ios 单击“取消”按钮时隐藏searchController搜索栏

我已经在viewController中实现了一个搜索控制器，它带有一个表视图和一个搜索控制器，搜索按钮录制时显示搜索栏，搜索按钮是UIBarButtonItem，搜索栏显示在导航控制器中，但我想在点击取消按钮时使其消失，我尝试过使用serarchBarDelegate协议，但在这里点击代码时什么也没发生

    class NewsTVController: UIViewController, UITableViewDataSource, UITableViewDelegate,UISearchResultsUpdating,UISearchBarDelegate{
let searchController = UISearchController(searchResultsController: nil)
    override func viewDidLoad() {
        super.viewDidLoad()
        searchController.searchResultsUpdater = self
        definesPresentationContext = true
        searchController.dimsBackgroundDuringPresentation = false
        searchController.hidesNavigationBarDuringPresentation = true

        self.searchController.hidesNavigationBarDuringPresentation = false

        loadNews()
    }


@IBAction func searchButtonTaped(sender:UIBarButtonItem){
        print("tap inside")
        self.navigationItem.titleView = searchController.searchBar
        //self.navigationItem.rightBarButtonItem?.action = #selector(hideSearchBar(:))
       // searchController.searchBar.touchesCancelled(UITouch, with: .touchUpInside){

        //}
        //self.navigationItem.rightBarButtonItem.
    }
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        hideSearchBar()
    }
    func hideSearchBar() {
        print("hay que escpder")
        //navigationItem.setLeftBarButtonItem(searchBarButtonItem, animated: true)
        //logoImageView.alpha = 0
        UIView.animate(withDuration: 0.3, animations: {
            self.navigationItem.titleView = nil// = self.logoImageView
            self.navigationItem.title = "Eventos"
            //self.logoImageView.alpha = 1
        }, completion: { finished in

        })
    }  
}

这里是带有搜索按钮和搜索栏的导航控制器的图片

我想要的是，当点击取消按钮时，导航栏保持第一张图片中的状态，没有搜索栏。

---

还有一些提示当搜索栏出现时，有一种方法可以隐藏“后退”按钮和“搜索”按钮。

由于我没有找到实现这一点的方法，我找到了这个解决方案

@IBAction func searchButtonTaped(sender:UIBarButtonItem){
        print("tap inside")
        self.navigationItem.titleView = searchController.searchBar
        searchController.searchBar.setShowsCancelButton(false, animated: false)
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Cancelar", style: .plain, target: self, action: #selector(hideSearchBar(sender:)))
        //self.searchIcon.is
        //self.navigationItem.rightBarButtonItem?.action = #selector(hideSearchBar(:))
       // searchController.searchBar.touchesCancelled(UITouch, with: .touchUpInside){

        //}
        //self.navigationItem.rightBarButtonItem.
    }
func hideSearchBar(sender:UIBarButtonItem) {
        print("hay que escpder")
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.search, target: self, action: #selector(searchButtonTaped(sender:)))
        //logoImageView.alpha = 0
        UIView.animate(withDuration: 0.3, animations: {
            self.navigationItem.titleView = nil// = self.logoImageView

            self.navigationItem.title = "Noticias"
            //self.logoImageView.alpha = 1
        }, completion: { finished in

        })
    }

---

boila搜索栏现在从导航控制器上消失了，搜索按钮起作用了，因为它链接到界面生成器中的SearchButton，因为我找不到实现这一点的方法，所以我找到了这个解决方案

@IBAction func searchButtonTaped(sender:UIBarButtonItem){
        print("tap inside")
        self.navigationItem.titleView = searchController.searchBar
        searchController.searchBar.setShowsCancelButton(false, animated: false)
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Cancelar", style: .plain, target: self, action: #selector(hideSearchBar(sender:)))
        //self.searchIcon.is
        //self.navigationItem.rightBarButtonItem?.action = #selector(hideSearchBar(:))
       // searchController.searchBar.touchesCancelled(UITouch, with: .touchUpInside){

        //}
        //self.navigationItem.rightBarButtonItem.
    }
func hideSearchBar(sender:UIBarButtonItem) {
        print("hay que escpder")
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.search, target: self, action: #selector(searchButtonTaped(sender:)))
        //logoImageView.alpha = 0
        UIView.animate(withDuration: 0.3, animations: {
            self.navigationItem.titleView = nil// = self.logoImageView

            self.navigationItem.title = "Noticias"
            //self.logoImageView.alpha = 1
        }, completion: { finished in

        })
    }

boila搜索栏现在从导航控制器中消失，搜索按钮可以正常工作，因为它链接到界面生成器中的搜索按钮