Underline button text in Swift

Swift 5 / Xcode 12/13

  @IBOutlet weak var myButton: UIButton!
   
  let yourAttributes: [NSAttributedString.Key: Any] = [
      .font: UIFont.systemFont(ofSize: 14),
      .foregroundColor: UIColor.blue,
      .underlineStyle: NSUnderlineStyle.single.rawValue
  ] // .double.rawValue, .thick.rawValue
         
  
  override func viewDidLoad() {
     super.viewDidLoad()
    
     let attributeString = NSMutableAttributedString(
        string: "Your button text",
        attributes: yourAttributes
     )
     myButton.setAttributedTitle(attributeString, for: .normal)
  }

Swift 4 / Xcode 9

  @IBOutlet weak var myButton: UIButton!
   
  let yourAttributes: [NSAttributedStringKey: Any] = [
      NSAttributedStringKey.font: UIFont.systemFont(ofSize: 14),
      NSAttributedStringKey.foregroundColor: UIColor.blue,
      NSAttributedStringKey.underlineStyle: NSUnderlineStyle.styleSingle.rawValue
  ] // .styleDouble.rawValue, .styleThick.rawValue, .styleNone.rawValue             
  
  override func viewDidLoad() {
    super.viewDidLoad()
    
    let attributeString = NSMutableAttributedString(
      string: "Your button text",
      attributes: yourAttributes
    )
    myButton.setAttributedTitle(attributeString, for: .normal)
  }

Swift 3 / Xcode 8

  @IBOutlet weak var myButton: UIButton!

  let yourAttributes: [String: Any] = [
      NSFontAttributeName: UIFont.systemFont(ofSize: 14),
      NSForegroundColorAttributeName: UIColor.white,
      NSUnderlineStyleAttributeName: NSUnderlineStyle.styleSingle.rawValue
  ] // .styleDouble.rawValue, .styleThick.rawValue, .styleNone.rawValue             

   override func viewDidLoad() {
      super.viewDidLoad()

      let attributeString = NSMutableAttributedString(
        string: "Your button text",
        attributes: yourAttributes
      )        
      myButton.setAttributedTitle(attributeString, for: .normal) 
    }