Swift: Convert HTML string to NSAttributedString

HTML-string-to-NSAttributedString.swift

// method 1
extension NSAttributedString {

    static func from(html: String) throws -> NSAttributedString {
        guard let data = html.data(using: String.Encoding.unicode, allowLossyConversion: true) {
            throws ArgumentError.invalidArgument("Invalid `html` string, failed to convert it to `Data`.")
        }

        return try NSAttributedString(
            data: data,
            options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
            documentAttributes: nil
        )
    }

}

// method 2
extension NSAttributedString {

    static func from(html: String) -> NSAttributedString? {
        guard let data = html.data(using: String.Encoding.utf8, allowLossyConversion: true) {
            return nil
        }

        return NSAttributedString(html: data, options: [:], documentAttributes: nil)
    }

}