问IOS: UISearchBar以提示部分覆盖UINavigationBar

EN

import UIKit

class searchTVC: UITableViewController, UISearchControllerDelegate, UISearchResultsUpdating {
    fileprivate let searchController = UISearchController(searchResultsController: nil)

    override func viewDidLoad() {
        super.viewDidLoad()

        title = "Title"
        navigationItem.prompt = "prompt"

        tableView.backgroundColor = UIColor.gray

        // Add search bar
        searchController.delegate = self
        searchController.searchResultsUpdater = self
        searchController.hidesNavigationBarDuringPresentation = false
        searchController.dimsBackgroundDuringPresentation = false
        searchController.searchBar.sizeToFit()

        tableView.tableHeaderView = searchController.searchBar

        // remove separators for empty table
        tableView.tableFooterView = UIView()
    }

    func updateSearchResults(for searchController: UISearchController) {
        // ignore
    }
}