ALabel 有边框

class ALabel: UILabel {
    @IBInspectable var insets: UIEdgeInsets = .zero {
        didSet {
            invalidateIntrinsicContentSize()
            setNeedsLayout()
        }
    }

    // MARK: Initialization

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupView()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setupView()
    }

    // MARK: Padding
    override func drawText(in rect: CGRect) {
        super.drawText(in: rect.inset(by: insets))
    }

    override var intrinsicContentSize: CGSize {
        var size = super.intrinsicContentSize
        size.width += insets.left + insets.right
        size.height += insets.top + insets.bottom
        return size
    }

    @IBInspectable var cornerRadius: CGFloat {
        get {
            return layer.cornerRadius
        }
        set {
            layer.cornerRadius = newValue
        }
    }
}