string_to_html_attributed_string.swift

import UIKit

extension String {
    func html(font: UIFont) -> NSAttributedString? {
        do {
            let modifiedText = String(format: "<span style=\"font-family: \(font.fontName); font-size: \(font.pointSize)\">%@</span>", self) as String
            
            let attrStr = try NSAttributedString(
                data: modifiedText.data(using: String.Encoding.unicode, allowLossyConversion: true)!,
                options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue],
                documentAttributes: nil)
            return attrStr
        } catch let error {
            debugPrint("label body error: \(error)")
            return nil
        }
    }
}