Underline under text

[rahuleastern]

I want to add underline for tag test. But not working.

public init(title: String) {
        super.init(frame: CGRect.zero)
        setTitle(title, for: UIControl.State()) 
        titleString.addAttribute(NSAttributedString.Key.underlineStyle, value: NSUnderlineStyle.single.rawValue, range: NSMakeRange(0, title.count))
        self.setAttributedTitle(titleString, for: .normal)
        setupView()
    }