HyperlinkLabel.swift

 override var attributedText: NSAttributedString? {
  get {
    return super.attributedText
  }
  set {
    super.attributedText = {
      guard let newValue = newValue else { return nil }
      // Apply custom hyperlink attributes
      let text = NSMutableAttributedString(attributedString: newValue)
      text.enumerateAttribute(.hyperlink, in: NSRange(location: 0, length: text.length), options: .longestEffectiveRangeNotRequired) { (value, subrange, _) in
        guard let value = value else { return }
        assert(value is URL)
        text.addAttributes(hyperlinkAttributes, range: subrange)
      }
      // Fill in font attributes when not set
      text.enumerateAttribute(.font, in: NSRange(location: 0, length: text.length), options: .longestEffectiveRangeNotRequired) { (value, subrange, _) in
        guard value == nil, let font = font else { return }
        text.addAttribute(.font, value: font, range: subrange)
      }
      return text
    }()
  }
}