為什么我的 searchBar 在點擊取消按鈕后沒有重置為初始狀態？

Question

我有一個搜索欄與取消按鈕。 當我單擊取消按鈕時，它不會將searchBar重置為其初始狀態。

這是完整的源代碼。

---

var searchBar: UISearchBar = UISearchBar()

    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        searchBarText = searchBar.text?.lowercased()
        searchBarScope = searchBar.selectedScopeButtonIndex
        showList()
    }

    func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
        searchBar.setShowsCancelButton(true, animated: true)
    }

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        searchBar.text = nil
        searchBar.setShowsCancelButton(false, animated: true)
        searchBar.endEditing(true)
    }

    public func setupSearchBarStyle() {
        UISearchBar.appearance().searchBarStyle = .minimal
        UISearchBar.appearance().backgroundColor = UIColor.white
        UISearchBar.appearance().barTintColor = UIColor.white
    }

    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
        self.searchBar.showsScopeBar = true
        if (navigationItem.title != nil) {
            self.searchBar.scopeButtonTitles = [String(format: "gesamte %@", ci("project_s")),  String(format: "in %@", navigationItem.title!)]
        }
    }

    override func viewDidLayoutSubviews() {
        self.searchBar.sizeToFit()
    }

    public override func viewDidLoad() {

        self.navigationController?.setNavigationBarHidden(false, animated: false)

        navigationItem.title = navigationItem.title ?? ci("plan_p")

        guard let projectId = GlobalState.selectedProjectId, let byProject : Results<Structure> = self.by(projectId: projectId) else {
            return
        }

        //search bar
        tableView.rowHeight = 100.0
        tableView.tableHeaderView = searchBar

        self.searchBar.showsCancelButton = true
        self.searchBar.sizeToFit()
        self.definesPresentationContext = true
        self.searchBar.delegate = self

        tableView.allowsMultipleSelectionDuringEditing = true

---

用戶單擊取消按鈕后，如何將searchBar更改為其初始狀態？ 現在，在用戶單擊取消后，它會將searchText更改為nil 。

Answer 1

在searchBarCancelButtonClicked函數中：

searchBar.text = ""
searchBar.showsCancelButton = false

同樣在textDidChange ：

yourSearchBar.showsCancelButton = true

Answer 2

我認為是因為這段代碼：

func searchBarTextDidEndEditing(searchBar: UISearchBar) {
    searchBar.setShowsCancelButton(true, animated: true)
}

它一定要是 ：

func searchBarTextDidEndEditing(searchBar: UISearchBar) {
    searchBar.setShowsCancelButton(false, animated: true)
}