如何将搜索栏与 Navigaitonbar 一起使用

Question

我已经成功地让 UISearchController 在一个新项目中工作，但是当我尝试在我自己的项目中做同样的事情时，它的行为会有所不同。

这就是我为使其正常工作所做的工作。

故事板：

这是我的视图控制器代码：

class ViewController: UIViewController, UISearchControllerDelegate, UISearchResultsUpdating, UISearchBarDelegate {

    var searchController : UISearchController!

    override func viewDidLoad() {
        super.viewDidLoad()

        let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let modalVC =  mainStoryboard.instantiateViewController(withIdentifier: "SearchTableViewController_SBID")
        self.searchController = UISearchController(searchResultsController:  modalVC)

        self.searchController.searchResultsUpdater = self
        self.searchController.delegate = self
        self.searchController.searchBar.delegate = self

        self.searchController.hidesNavigationBarDuringPresentation = false
        self.searchController.dimsBackgroundDuringPresentation = true

        self.navigationItem.titleView = searchController.searchBar

        self.definesPresentationContext = true
    }

    func updateSearchResults(for searchController: UISearchController) {

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

我得到的结果是，当我点击搜索栏时，背景会变暗，而当我开始输入时，tableview 控制器会可见，会不会搜索栏在导航栏中仍然可见表格视图控制器。

但是，当我尝试在我的项目中实现相同的东西时，当我开始在搜索栏上输入时，表格视图控制器将填满整个屏幕，并且导航栏不可见。

这是我的项目的故事板：

请注意，这两个项目是相似的，除了其中一个是Navigation Controller -> Tab Bar View Controller，当我在搜索栏上键入时它不显示导航栏。

如何在项目Navigation Controller -> Tab Bar View Controller 中显示导航栏？

这是 2 个项目的样子：

Answer 1

故事板设置

两个视图控制器的编码

class ViewController1: UIViewController,UISearchBarDelegate {
    @IBOutlet weak var lbl1: UILabel!
    var searchBar:UISearchBar? = nil
    override func viewDidLoad() {
        super.viewDidLoad()

        //Code to identify the searchbar
        for view in (self.tabBarController?.navigationItem.titleView?.subviews)!
        {
            if view.isKind(of: UISearchBar.self)
            {
                searchBar = (view as! UISearchBar);
            }
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        //Assign Delegate and blank the search bar text 
        searchBar?.text = ""
        searchBar?.delegate = self

    }
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        lbl1.text = "Tab 1 : \(searchText)"

    }

}
class ViewController2: UIViewController,UISearchBarDelegate {
    @IBOutlet weak var lbl1: UILabel!
    var searchBar:UISearchBar? = nil
    override func viewDidLoad() {
        super.viewDidLoad()

        //Code to identify the searchbar
        for view in (self.tabBarController?.navigationItem.titleView?.subviews)!
        {
            if view.isKind(of: UISearchBar.self)
            {
                searchBar = (view as! UISearchBar);
            }
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        searchBar?.text = ""
        searchBar?.delegate = self
    }
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        lbl1.text = "Tab 2 : \(searchText)"

    }

}

结果