Custom Button - Initial Setup

MyCustomButton.swift

final class MyCustomButton: UIButton {
    override var isEnabled: Bool {
        didSet {
            updateBackground()
        }
    }

    var style: ButtonStyle {
        didSet {
            apply(style: style)
        }
    }

    init(style: style = .primary) {
        self.style = style
        super.init(frame: .zero)
        apply(style: style)
    }

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

    private func apply(style: ButtonStyle) {
        titleLabel?.font = style.font
        setTitleColor(style.enabledTextColor, for: .normal)
        setTitleColor(style.disabledTextColor, for: .disabled)

        layer.borderWidth = style.borderWidth
        layer.borderColor = style.borderColor.cgColor
        layer.cornerRadius = style.cornerRadius

        updateBackground()
    }

    private func updateBackground() {
        if isEnabled {
            backgroundColor = style.enabledBackgroundColor
        } else {
            backgroundColor = style.disabledBackgroundColor
        }
    }
}