快速將searchBar添加到navigationBar

Question

我正在嘗試向導航欄添加一個搜索欄。 我已經研究了一下，這就是我到目前為止所做的：

問題是使用此代碼的導航欄沒有任何顯示。

    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

試試這個對我有用的代碼：

 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

嘗試這個

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

Answer 3

你可以用這個

private let searchController = UISearchController(searchResultsController: nil)

override func viewDidLoad() {

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