HTML string to NSAttributedString

// Swift 4
extension String {

    func toAttributedString(color: UIColor?, font: UIFont?) -> NSAttributedString {

        do {

            var string = self
            if color != nil, font != nil {
                string = """
                    <style>
                        body {
                            color:\(color!.hex);
                            font-size:\(font!.pointSize)px;
                            font-family:'\(font!.fontName)';
                        }
                    </style>\(self)
                """
            }

            guard let data = string.data(using: .utf8) else {
                return NSAttributedString(string: self)
            }

            let options: [NSAttributedString.DocumentReadingOptionKey: Any] = [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue]

            let attrString = try NSMutableAttributedString(data: data, options: options, documentAttributes: nil)

            return attrString
        } catch {
            print("error:", error)
            return  NSAttributedString(string: self)
        }
    }
}