swift - 如何从 UINavigationItem 中关闭 UISearchController？

Question

我有一个嵌入在 UINavigationController 中的 UIViewController ，其中 UICollectionView 填充了屏幕。在 UINavigationBar 中，我有一个按钮，当选择时，该按钮会在 UINavigationBar 下显示 UISearchBar 。我这一切都工作正常。问题是，当选择 UISearchBar 上的“取消”按钮时，我无法关闭搜索栏。这是我的代码:

var searchController = UISearchController()

override func viewDidLoad() {
    super.viewDidLoad()

    searchController = UISearchController(searchResultsController: nil)
    searchController.searchResultsUpdater = self
    searchController.delegate = self
    searchController.searchBar.delegate = self
    searchController.hidesNavigationBarDuringPresentation = false
    searchController.dimsBackgroundDuringPresentation = false
    searchController.searchBar.placeholder = "Search for Title"

    self.navigationItem.searchController = searchController
}

@IBAction func searchSelected(_ sender: UIBarButtonItem) {
    searchController.isActive = true
}

func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
    print("cancel clicked")
    searchController.isActive = false
}

Answer 1

用途:

navigationItem.searchController = nil