键盘在“在任何地方”中的导航项目中解雇搜索控制器

Question

在导航的项目标题视图中，我在UisearchController中使用了UITATEVIEWCONTROLLER。我想在表观中的任何地方轻按一下键盘。怎么做？

到目前为止，这是我的代码：

extension UIViewController {
    func hideKeyboardWhenTappedAround() {
        let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(UIViewController.dismissKeyboard))
        tap.cancelsTouchesInView = false
        view.addGestureRecognizer(tap)
    }
    func dismissKeyboard() {
        view.endEditing(true)
    }
}
class TableViewController: UITableViewController, UISearchResultsUpdating {
    override func viewDidLoad() {
        super.viewDidLoad()
        hideKeyboardWhenTappedAround()
        let searchController = UISearchController(searchResultsController: nil)
        searchController.searchResultsUpdater = self
        navigationItem.titleView = searchController.searchBar
    }
    func updateSearchResults(for searchController: UISearchController) {
        //
    }
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 40
    }
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "CellID", for: indexPath)
        cell.textLabel?.text = "test1"
        return cell
    }
}

Answer 1

您的searchController不在ViewController视图层次结构中，它在NavigationController视图层次结构中，这就是为什么您的代码不工作的原因。

如果将代码更改为此

func dismissKeyboard() {
    navigationController?.view.endEditing(true)
}

它将起作用。

Answer 2

我最终得到了非常好的解决方案，因为TapGestureRecognizer并不是我所需要的。仅当我从屏幕上释放手指时，它才会发射，而当我滚动时，它根本不起作用。所以：

import UIKit
import UIKit.UIGestureRecognizerSubclass
class KeyboardDismissalGestureRecognizer: UIGestureRecognizer {
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
        if self.state == .possible {
            UIApplication.shared.keyWindow?.endEditing(true)
        }
    }
}
extension UIViewController {
    func hideKeyboardWhenTouchedAround() {
        let tap = KeyboardDismissalGestureRecognizer(target: self, action: nil)
        tap.cancelsTouchesInView = false
        view.addGestureRecognizer(tap)
    }
}
class TableViewController: UITableViewController, UISearchResultsUpdating {
    override func viewDidLoad() {
        super.viewDidLoad()
        hideKeyboardWhenTouchedAround()
        let searchController = UISearchController(searchResultsController: nil)
        searchController.searchResultsUpdater = self
        navigationItem.titleView = searchController.searchBar
    }
//.....
}