Swift -> UILable 设置内边距 UIEdgeInsets

class UILabel_2:UILabel{
    open var insetEdge:UIEdgeInsets!;
    override func drawText(in rect: CGRect) {
        super.drawText(in: UIEdgeInsetsInsetRect(rect, insetEdge))
    }
}

使用

let testText = UILabel_2(frame: CGRect(x: 10, y: 8, width: 20, height: 34));
testText.insetEdge = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 20)