為什么#selector不為iPad的鍵盤快捷方式調用處理程序方法？

Question

我有一個用於構造UIBarButtonItems的類：

enum KeyboardToolbarButton: Int {

    case done = 0
    case cancel
    case back, backDisabled
    case forward, forwardDisabled

    func createButton(target: Any?, action: Selector?) -> UIBarButtonItem {
        var button: UIBarButtonItem!

        switch self {
        case .back:
            button = UIBarButtonItem(title: "<=", style: .plain, target: target, action: action)
        case .backDisabled:
            button = UIBarButtonItem(title: "<=", style: .plain, target: target, action: action)
            button.isEnabled = false
        case .forward:
            button = UIBarButtonItem(title: "=>", style: .plain, target: target, action: action)
        case .forwardDisabled:
            button = UIBarButtonItem(title: "=>", style: .plain, target: target, action: action)
            button.isEnabled = false
        case .done:
            button = UIBarButtonItem(title: "DONE", style: .plain, target: target, action: action)
        case .cancel:
            button = UIBarButtonItem(title: "CANCEL", style: .plain, target: target, action: action)
        }
        button.tag = rawValue
        return button
    }

    static func detectType(barButton: UIBarButtonItem) -> KeyboardToolbarButton? {
        return KeyboardToolbarButton(rawValue: barButton.tag)
    }
}

從KeyboardToolbarButton構造KeyboardToolbar的類：

class KeyboardToolbar {

    weak var toolBarDelegate: KeyboardToolbarDelegate?
    var textField: UITextField!

    init(textField: UITextField) {

        self.textField = textField
        self.textField.autocorrectionType = .no
        self.textField.inputAssistantItem.leadingBarButtonGroups = []
        self.textField.inputAssistantItem.trailingBarButtonGroups = []
    }

    func setup(leftButtons: [KeyboardToolbarButton], rightButtons: [KeyboardToolbarButton]) {

        let leftBarButtons = leftButtons.map { (item) -> UIBarButtonItem in
            return item.createButton(target: self, action: #selector(self.buttonTapped(sender:)))
        }

        let rightBarButtons = rightButtons.map { (item) -> UIBarButtonItem in
            return item.createButton(target: self, action: #selector(self.buttonTapped(sender:)))
        }

        let groupLeading: UIBarButtonItemGroup = UIBarButtonItemGroup.init(barButtonItems: leftBarButtons, representativeItem: nil)
        let groupTrailing: UIBarButtonItemGroup = UIBarButtonItemGroup.init(barButtonItems: rightBarButtons, representativeItem: nil)

        textField.inputAssistantItem.leadingBarButtonGroups.append(groupLeading)
        textField.inputAssistantItem.trailingBarButtonGroups.append(groupTrailing)
    }


    @objc func buttonTapped(sender: UIBarButtonItem) {
        if let type = KeyboardToolbarButton.detectType(barButton: sender) {
            print(type)
            toolBarDelegate?.keyboardToolbar(button: sender, type: type, tappedIn: self)
        }
    }

}

並委托：

protocol KeyboardToolbarDelegate: class {
    func keyboardToolbar(button: UIBarButtonItem, type: KeyboardToolbarButton, tappedIn toolbar: KeyboardToolbar)
}

這是我使用KeyboardToolbar的方法：

class ViewController: UIViewController {

    @IBOutlet weak var textField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()


        addButtons(for: textField, setLeftButtons: [.back, .forward], andRightButtons: [.done])
    }


    private func addButtons(for textField: UITextField, setLeftButtons leftButtons: [KeyboardToolbarButton] = [], andRightButtons rightButtons: [KeyboardToolbarButton] = []) {
        let toolbar = KeyboardToolbar(textField: textField)
        toolbar.toolBarDelegate = self
        toolbar.setup(leftButtons: leftButtons, rightButtons: rightButtons)
    }

}

extension ViewController: KeyboardToolbarDelegate {
    func keyboardToolbar(button: UIBarButtonItem, type: KeyboardToolbarButton, tappedIn toolbar: KeyboardToolbar) {

        print("Tapped button type: \(type)")


    }
}

工作原理如下（此功能僅在iPad上可用）

因此，問題在於@objc func buttonTapped（sender：UIBarButtonItem）永遠不會調用。 因此，#selector（self.buttonTapped（sender :)不連接到處理程序。如何解決？

更新：

根據Taras Chernyshenko的回答，我將KeyboardToolbar添加為ViewController的成員：

class ViewController: UIViewController {

    @IBOutlet weak var textField: UITextField!
    var toolbar: KeyboardToolbar!

    override func viewDidLoad() {
        super.viewDidLoad()

        addButtons(for: textField, setLeftButtons: [.back, .forward], andRightButtons: [.done])
    }


    private func addButtons(for textField: UITextField, setLeftButtons leftButtons: [KeyboardToolbarButton] = [], andRightButtons rightButtons: [KeyboardToolbarButton] = []) {
        toolbar = KeyboardToolbar(textField: textField)
        toolbar.toolBarDelegate = self
        toolbar.setup(leftButtons: leftButtons, rightButtons: rightButtons)
    }

}

Answer 1

問題出在您的設計中。 在func setup(leftButtons:, rightButtons:)函數的KeyboardToolbar類中func setup(leftButtons:, rightButtons:)要做的是：

let leftBarButtons = leftButtons.map { (item) -> UIBarButtonItem in
    return item.createButton(target: self, action: #selector(self.buttonTapped(sender:)))
}

在這里，您將action target設置為KeyboardToolbar類。

接下來，在ViewController addButtons(for textField:, setLeftButtons leftButtons:, andRightButtons rightButtons:) ，您可以像設置按鈕一樣

let toolbar = KeyboardToolbar(textField: textField)
toolbar.toolBarDelegate = self
toolbar.setup(leftButtons: leftButtons, rightButtons: rightButtons)

但在取消分配此功能toolbar后，操作將無法達到其目標。

要簡單修復，請將toolbar存儲到類屬性中

class ViewController: UIViewController {

    @IBOutlet weak var textField: UITextField!

    var toolbar = KeyboardToolbar?
    override func viewDidLoad() {
        super.viewDidLoad()


        addButtons(for: textField, setLeftButtons: [.back, .forward], andRightButtons: [.done])
    }


    private func addButtons(for textField: UITextField, setLeftButtons leftButtons: [KeyboardToolbarButton] = [], andRightButtons rightButtons: [KeyboardToolbarButton] = []) {
        let toolbar = KeyboardToolbar(textField: textField)
        toolbar.toolBarDelegate = self
        toolbar.setup(leftButtons: leftButtons, rightButtons: rightButtons)
        self.toolbar = toolbar
    }

}