如何隐藏 .numberPad 键盘上的字母？

Question

默认情况下，当在 iPhone 上使用.numberPad 键盘时，数字键的每个键底部也有字母。

这些字母纯粹是装饰性的，用于帮助人们输入数字；但就我而言（输入商品数量），它们完全是多余的，甚至可能令人困惑。

是否可以将键盘配置为隐藏这些字母？ 我应该实现自己的键盘视图来正确显示按键吗？

Answer 1

我认为目前没有没有文本字符的“仅数字”键盘。

但您可以创建自己的：

textField.inputView = NumericKeyboard(target: textField)

在哪里

class DigitButton: UIButton {
    var digit: Int = 0
}

class NumericKeyboard: UIView {
    weak var target: UIKeyInput?

    var numericButtons: [DigitButton] = (0...9).map {
        let button = DigitButton(type: .system)
        button.digit = $0
        button.setTitle("\($0)", for: .normal)
        button.titleLabel?.font = UIFont.preferredFont(forTextStyle: .largeTitle)
        button.setTitleColor(.black, for: .normal)
        button.layer.borderWidth = 0.5
        button.layer.borderColor = UIColor.darkGray.cgColor
        button.accessibilityTraits = [.keyboardKey]
        button.addTarget(self, action: #selector(didTapDigitButton(_:)), for: .touchUpInside)
        return button
    }

    var deleteButton: UIButton = {
        let button = UIButton(type: .system)
        button.setTitle("⌫", for: .normal)
        button.titleLabel?.font = UIFont.preferredFont(forTextStyle: .largeTitle)
        button.setTitleColor(.black, for: .normal)
        button.layer.borderWidth = 0.5
        button.layer.borderColor = UIColor.darkGray.cgColor
        button.accessibilityTraits = [.keyboardKey]
        button.accessibilityLabel = "Delete"
        button.addTarget(self, action: #selector(didTapDeleteButton(_:)), for: .touchUpInside)
        return button
    }()

    init(target: UIKeyInput) {
        self.target = target
        super.init(frame: .zero)
        configure()
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

// MARK: - Actions

extension NumericKeyboard {
    @objc func didTapDigitButton(_ sender: DigitButton) {
        target?.insertText("\(sender.digit)")
    }

    @objc func didTapDeleteButton(_ sender: DigitButton) {
        target?.deleteBackward()
    }
}

// MARK: - Private initial configuration methods

private extension NumericKeyboard {
    func configure() {
        autoresizingMask = [.flexibleWidth, .flexibleHeight]
        addButtons()
    }

    func addButtons() {
        let stackView = createStackView(axis: .vertical)
        stackView.frame = bounds
        stackView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        addSubview(stackView)

        for row in 0 ..< 3 {
            let subStackView = createStackView(axis: .horizontal)
            stackView.addArrangedSubview(subStackView)

            for column in 0 ..< 3 {
                subStackView.addArrangedSubview(numericButtons[row * 3 + column + 1])
            }
        }

        let subStackView = createStackView(axis: .horizontal)
        stackView.addArrangedSubview(subStackView)

        let blank = UIView()
        blank.layer.borderWidth = 0.5
        blank.layer.borderColor = UIColor.darkGray.cgColor

        subStackView.addArrangedSubview(blank)
        subStackView.addArrangedSubview(numericButtons[0])
        subStackView.addArrangedSubview(deleteButton)
    }

    func createStackView(axis: NSLayoutConstraint.Axis) -> UIStackView {
        let stackView = UIStackView()
        stackView.axis = axis
        stackView.alignment = .fill
        stackView.distribution = .fillEqually
        return stackView
    }
}

产生：

显然，您可以发疯，自定义您的键盘以使其看起来像您想要的那样。以上是相当原始的，我只是冲撞在一起。但它说明了这个想法：创建自己的输入视图并使用UIKeyInput 协议将键盘输入传达给控件。