UITextField 的文本插入？

Question

我想插入UITextField 的文本。

这可能吗？

Answer 1

您可能需要这个同时支持leftView 和rightView 的解决方案。 ?

class InsettedTextField: UITextField {

    private let textInset: UIEdgeInsets

    var rightViewInset: CGRect {
        rightView.flatMap { $0.frame } ?? .zero
    }

    var leftViewInset: CGRect {
        leftView.flatMap { $0.frame } ?? .zero
    }

    /// Init the text field with insets.
    init(textInset: UIEdgeInsets) {
        self.textInset = textInset
        super.init(frame: .zero)
    }

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

    override func textRect(forBounds bounds: CGRect) -> CGRect {
        bounds
            .inset(by: textInset)
            .inset(by: UIEdgeInsets(top: 0, left: leftViewInset.width, bottom: 0, right: rightViewInset.width))
    }

    override func placeholderRect(forBounds bounds: CGRect) -> CGRect {
        bounds
            .inset(by: textInset)
            .inset(by: UIEdgeInsets(top: 0, left: leftViewInset.width, bottom: 0, right: rightViewInset.width))
    }

    override func editingRect(forBounds bounds: CGRect) -> CGRect {
        bounds
            .inset(by: textInset)
            .inset(by: UIEdgeInsets(top: 0, left: leftViewInset.width, bottom: 0, right: rightViewInset.width))
    }
}