swift设置label下划线

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extension UILabel {

    func underline() {

        if let textString = self.text {

            let attributedString = NSMutableAttributedString(string: textString)

            attributedString.addAttribute(.underlineStyle, value: NSUnderlineStyle.styleSingle.rawValue, range: NSRange(location: 0, length: attributedString.length))

            attributedText = attributedString

        }

    }

}