iOS v10 或更低版本 : How to add UISearchController in the bottom of navigation bar Programmatically

Question

我的应用程序的最低 iOS 版本是 10.3。我可以在 iOS 11 的导航栏底部添加搜索栏。但我希望较低版本的 iOS 11 也能添加搜索栏，并且它应该是编程式的。请帮忙。谢谢

fileprivate func _setupNavigationBar() {
    let searchController = UISearchController(searchResultsController: nil)
    searchController.searchResultsUpdater = self
    searchController.obscuresBackgroundDuringPresentation = false
    searchController.searchBar.placeholder = "Search Here"
    if #available(iOS 11.0, *) {
        navigationItem.searchController = searchController
    } else {
        // TODO: ????????????????
    }
} 

Answer 1

class ViewController: UIViewController, UISearchControllerDelegate {

var controladorDeBusca: UISearchController!

var resultsTableViewController: ResultsTableViewController?

override func viewDidLoad() {
    super.viewDidLoad()

    resultsTableViewController = storyboard!.instantiateViewController(withIdentifier: "resultsTableViewController") as? ResultsTableViewController

    setUpSearchAtNaviagtion()
}

func setUpSearchAtNaviagtion() {

    controladorDeBusca = UISearchController(searchResultsController: resultsTableViewController)
    controladorDeBusca.delegate = self
    controladorDeBusca.searchResultsUpdater = resultsTableViewController
    controladorDeBusca.dimsBackgroundDuringPresentation = true
    definesPresentationContext = true

    controladorDeBusca.loadViewIfNeeded()

    //Configura a barra do Controlador de busca
    controladorDeBusca.searchBar.delegate = resultsTableViewController
    controladorDeBusca.hidesNavigationBarDuringPresentation = false
    controladorDeBusca.searchBar.placeholder = "Search place"
    controladorDeBusca.searchBar.sizeToFit()
    controladorDeBusca.searchBar.barTintColor = navigationController?.navigationBar.barTintColor
    controladorDeBusca.searchBar.tintColor = self.view.tintColor

    //Adiciona a barra do Controlador de Busca a barra do navegador
    navigationItem.titleView = controladorDeBusca.searchBar
}
}

试试这个..