UISearchBar resignFirstResponder 不工作

Posted 2023-03-13

【中文标题】UISearchBar resignFirstResponder 不工作

【英文标题】：UISearchBar resignFirstResponder not working

【发布时间】：2018-03-02 10:23:22

【问题描述】：

UIViewController 需要在viewWillDisappear 或viewDidDisappear 方法中隐藏键盘。 UIViewController消失后留在记忆中，可以再次呈现。首次出现时 UISearchBar 不是 firstResponder 并且键盘是隐藏的。但是如果我弹出UIViewController 并显示键盘然后再次按下它 - 键盘没有隐藏，但是我打电话：

override func viewDidLoad() 
    super.viewDidLoad()
    instrumentsTableView.register(UINib(nibName: kDealsFilterInstrumentTableViewCellNib, bundle: nil), forCellReuseIdentifier: kDealsFilterInstrumentTableViewCellReusableId)
    instrumentsTableView.dataSource = self
    instrumentsTableView.delegate = self


override func viewDidDisappear(_ animated: Bool) 
    super.viewDidDisappear(animated)
    if presenter.numberOfInstruments != 0 
        instrumentsTableView.scrollToRow(at: IndexPath(row: 0, section: 0), at: .top, animated: false)
    
    KeyboardManager.shared.unsubscribe()
    instrumentsSearchBar.text = ""
    presenter.findInstruments(with: "") //just sets settings to default/ reloads data


    instrumentsSearchBar.endEditing(true)
    instrumentsSearchBar.resignFirstResponder()
    view.endEditing(true)
    view.resignFirstResponder()


override func viewWillDisappear(_ animated: Bool) 
    super.viewWillDisappear(animated)


override func viewDidAppear(_ animated: Bool) 
    super.viewDidAppear(animated)
    KeyboardManager.shared.subscribe(self)

KeyboardManager - 如果键盘状态发生变化，则发送通知（如果相关）：

final class KeyboardManager 

    private init() 
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: Notification.Name.UIKeyboardWillShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: Notification.Name.UIKeyboardWillHide, object: nil)
    

    static let shared = KeyboardManager()

    @objc private func keyboardWillShow(_ notification: Notification) 
        if let keyboardSize = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue 
            let height = keyboardSize.cgRectValue.height
            keyboardHeight = height
            keyboardState = .shown
        
    

    @objc private func keyboardWillHide(_ notification: Notification) 
        keyboardHeight = 0
        keyboardState = .hidden
    

    private weak var subscriber: KeyboardManagerDelegate?

    func subscribe(_ delegate: KeyboardManagerDelegate) 
        subscriber = delegate
    

    func unsubscribe() 
        subscriber = nil
    

    private var keyboardHeight: CGFloat = 0

    private var keyboardState: KeyboardState = .hidden 
        didSet 
            if keyboardState != oldValue 
                subscriber?.keyboardDidChange(state: keyboardState, height: keyboardHeight)
            
        
    


enum KeyboardState 
    case shown
    case hidden


protocol KeyboardManagerDelegate: class 
    func keyboardDidChange(state: KeyboardState, height: CGFloat)

我尝试在 viewWillAppear 和 viewWillDisappear 中使用此代码 - 但 UISearchBar 仍然是 firstResponder。如果我在隐藏键盘的情况下弹出 - 它会保持隐藏状态。可能是什么问题？

截图：

Sample project with the same issue on bitbucket

【问题讨论】：

你能分享GIF吗

你在使用 UISearchController 吗？然后只需在viewWillDisappear 中调用searchController.isActive = false，它就会关闭搜索栏。

@fl034 不，我正在使用 UIViewController 和 UISearchBar

在弹出 viewController 之前尝试退出搜索栏。

@JuicyFruit 你在 viewWillAppear 中写了 searchBar.becomeFirstResponder() 吗？？

【参考方案1】：

对于键盘问题，这可以正常工作，

self.view.endEditing(true)

写在viewWillDisappear或viewDidDisappear

【参考方案2】：

我已经尝试过您的代码：Sample project with the same issue on bitbucket，它的工作正常且正常。

这是代码。

class ViewController: UIViewController 

    @IBAction func btnShowSearch(button: UIButton) 
        if let search = self.storyboard?.instantiateViewController(withIdentifier: "SeachBarViewController") 
            self.navigationController?.pushViewController(search, animated: true)
        
    



// SeachBarViewController
class SeachBarViewController: UIViewController 

    @IBOutlet var searchBar: UISearchBar!

    override func viewDidDisappear(_ animated: Bool) 
        super.viewDidDisappear(animated)
        attemptToHidKeyboard()
    

    override func viewWillDisappear(_ animated: Bool) 
        super.viewWillDisappear(animated)
        attemptToHidKeyboard()
    

    override func viewWillAppear(_ animated: Bool) 
        super.viewWillAppear(animated)
        attemptToHidKeyboard()
    

    override func didMove(toParentViewController parent: UIViewController?) 
        if parent == nil 
            attemptToHidKeyboard()
        
    

    override func willMove(toParentViewController parent: UIViewController?) 
        if parent == nil 
            attemptToHidKeyboard()
        
    


    private func attemptToHidKeyboard() 
        self.searchBar.resignFirstResponder()
        self.searchBar.endEditing(true)
        self.view.resignFirstResponder()
        self.view.endEditing(true)
    

结果如下：

【讨论】：

你能指定ios版本的模拟器吗？你没有更改任何代码？

你没有改变rootviewcontroller的代码，我用SearchBar存储控制器？如果是这样，它必须已经修复，因为它在使用 Xcode 9.2 构建的 iOS 11.2 和 iOS 10 上的行为不是这样

我使用了你的故事板和 SearchBarController 文件。没有别的......它的工作原理。我也有 Xcode 9.2。让我检查一下 Xcode 9.2

你的代码不一样。检查我的RootViewController，我想存储SearchViewController，而不是在按钮单击时启动它