Underline button text in Swift

Question

I have UIButton. In interface builder I set its title to be \'Attributed\'. How can I make its title to be underlined from code in Swift?

@IBOutlet weak var myBt         


        

Answer 1

Swift 5 / Xcode 11

  @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) 
    }