快速将searchBar添加到navigationBar

Question

我正在尝试向导航栏添加一个搜索栏。 我已经研究了一下，这就是我到目前为止所做的：

问题是使用此代码的导航栏没有任何显示。

    searchBar = UISearchBar(frame: CGRectMake(0, 0, 320, 44))
    searchBar?.delegate = self
    searchBar?.showsCancelButton = true


    searchController = UISearchDisplayController()
    searchController?.delegate = self
    searchController?.searchResultsDelegate = self

    searchController?.displaysSearchBarInNavigationBar = true

Answer 1

试试这个对我有用的代码：

 lazy   var searchBars:UISearchBar = UISearchBar(frame: CGRectMake(0, 0, 200, 20))

override func viewDidLoad() {
    super.viewDidLoad()
    var leftNavBarButton = UIBarButtonItem(customView: searchBars)
    self.navigationItem.leftBarButtonItem = leftNavBarButton
}

Answer 2

尝试这个

lazy var searchBar = UISearchBar(frame: .zero)
override func viewDidLoad() {
    super.viewDidLoad()
 navigationItem.titleView = searchBar} 

Answer 3

你可以用这个

private let searchController = UISearchController(searchResultsController: nil)

override func viewDidLoad() {

 self.navigationItem.searchController = searchController
 self.navigationItem.hidesSearchBarWhenScrolling = false
}