为什么#selector 不为 iPad 的键盘快捷键调用处理程序方法？

Question

我有一个用于构造 UIBarButtonItems 的类：

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)
    }
}

从 KeyboardToolbarButton 构造 KeyboardToolbar 的类：

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)
        }
    }

}

和委托：

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

这是我使用键盘工具栏的方法：

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)")


    }
}

这是它的工作原理（此功能仅在 iPad 上可用）

所以，问题在于 @objc func buttonTapped(sender: UIBarButtonItem) 从不调用。那么，#selector(self.buttonTapped(sender:) 没有连接到处理程序。如何解决？

更新：

根据 Taras Chernyshenko 的回答，我将 KeyboardToolbar 添加为 ViewController 的成员：

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

问题在于您的设计。在func setup(leftButtons:, rightButtons:) 函数中的KeyboardToolbar 类中你接下来要做的：

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

在这里，您将 action target 设置为 KeyboardToolbar 类。

接下来在addButtons(for textField:, setLeftButtons leftButtons:, andRightButtons rightButtons:) 或ViewController 中设置按钮

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

但在此函数toolbar 被释放后，操作无法达到其目标。

为了简单的修复，将toolbar 存储到类属性中

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
    }

}