iOS - 如何在点击 UIView 的任意位置时从 navigationItem.searchController 关闭键盘?

iOS - How to dismiss keyboard from the navigationItem.searchController when tap anywhere on the UIView?

我已经实现了新的 SearchController 及其 searchBarsearchResultsController

以下是我的实现方式:

结果视图控制器:

lazy var resultViewController: SearchResultViewController = {
    let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
    let searchResultViewController = storyboard.instantiateViewController(withIdentifier: "SearchResultViewController") as! SearchResultViewController
    searchResultViewController.delegate = self
    return searchResultViewController
}()

这是搜索控制器:

lazy var searchController: UISearchController = {
    let searchController = UISearchController(searchResultsController: resultViewController)
    searchController.searchBar.delegate = self
    searchController.obscuresBackgroundDuringPresentation = true
    searchController.searchResultsUpdater = self
    searchController.searchBar.placeholder = "Search.city.label".localizable()
    searchController.searchBar.tintColor = UIColor.white
    searchController.searchBar.barTintColor = UIColor.white
    UITextField.appearance(whenContainedInInstancesOf: [type(of: searchController.searchBar)]).tintColor = UIColor(red:0.00, green:0.47, blue:0.78, alpha:1.0)

    if let textfield = searchController.searchBar.value(forKey: "searchField") as? UITextField {
        if let backgroundview = textfield.subviews.first {

            // Background color
            backgroundview.backgroundColor = UIColor.white

            // Rounded corner
            backgroundview.layer.cornerRadius = 10;
            backgroundview.clipsToBounds = true;
        }
    }

    definesPresentationContext = true
    return searchController
}()

在我的 viewWillAppear 中,我设置了 navigationItem.searchController :

self.searchController.isActive = true

if #available(iOS 11.0, *) {
    self.navigationItem.searchController = searchController
    self.navigationItem.hidesSearchBarWhenScrolling = true
} else {
    // Fallback on earlier versions
}

我已经能够处理 cancelButtonClicked :

extension HomeViewController: UISearchBarDelegate {

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        searchBar.endEditing(true)
        self.searchController.isActive = false
    }
}

这是在做 "cancel" 动画,在 searchBar/searchController 上隐藏键盘 + 非活动状态。同时点击取消按钮 1 次。

但是当用户点击视图上的任意位置时,我无法实现这一点。

我尝试使用点击手势,但它需要我点击 2 次才能实现相同的行为。

注意:

我的 UIViewController 中有一个 UICollectionView,它占据了 UIView 中的所有位置。

这是我试过的方法:

override func viewDidLoad() {
    super.viewDidLoad()
    handleTapAnywhereToRemoveKeyboard()
}


func handleTapAnywhereToRemoveKeyboard() {
    let singleTapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(self.singleTap(sender:)))
    //singleTapGestureRecognizer.numberOfTapsRequired = 1
    singleTapGestureRecognizer.cancelsTouchesInView = false
    self.view.addGestureRecognizer(singleTapGestureRecognizer)
}

@objc func singleTap(sender: UITapGestureRecognizer) {
    self.searchController.isActive = false
    self.searchController.searchBar.resignFirstResponder()
    self.searchController.searchBar.endEditing(true)
}

编辑:

我在想,也许是因为我的 searchBar 和 searchController 不在 UIViewController 的视图层次结构中,而是在 NavigationController 的视图层次结构中。

所以我也试过 :

navigationController?.view.endEditing(true)

然后我在想,也许是因为我的 UICollectionView 中的 UIScrollView 正在捕捉水龙头。 所以我尝试 link 在 UICollectionView 而不是 UIView 上点击手势,但没有成功。

请创建 UIViewController 以关闭键盘整个应用程序。

extension UIViewController {
    func hideKeyboardWhenTappedAround() {
        let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(UIViewController.dismissKeyboard))
        tap.cancelsTouchesInView = false
        view.addGestureRecognizer(tap)
    }

    @objc func dismissKeyboard() {
        view.endEditing(true)
    }
}

在您的 UIViewController 文件中使用上面的代码,如下所示。

override func viewDidLoad() {
     super.viewDidLoad()
     self.hideKeyboardWhenTappedAround() 
}

更新:

您还可以使用以下代码从任何 class.

中关闭键盘
UIApplication.shared.sendAction(#selector(UIResponder.resign‌​FirstResponder), to: nil, from: nil, for: nil)

尝试 Dimple Desai 的解决方案,但将手势识别器添加到 TableView 或 CollectionView 或位于 UIView 之上的任何内容。然后它应该工作。

override func viewDidLoad(){

   let tapView = UITapGestureRecognizer(target: self, action: #selector(self.hideKeyboard))
   self.view.addGestureRecognizer(tapView)
}

@objc func hideKeyboard(tap: UITapGestureRecognizer){

   self.view.endEditing(true)
}

不需要按照上面的建议添加UITapGestureRecognizerUIViewContoller 已经符合 UIResponder 接口(遗留于 Objective C),因此您可以像这样覆盖此方法:

extension UIViewController {

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
            self.view.window?.endEditing(true)
            super.touchesEnded(touches, with: event)
        }

}