Create an attributed String from a RTF File.

NSAttributedString+RTF.swift

import Foundation
import UIKit

extension NSAttributedString {
    
    convenience init?(fromRTF name: String) {
        guard let url = Bundle.main.url(forResource: name, withExtension: "rtf") else {
            return nil
        }
        guard let data = try? Data(contentsOf: url) else {
            return nil
        }
        let options: [String: Any] = [NSDocumentTypeDocumentAttribute: NSRTFTextDocumentType,
                                      NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue]
        try? self.init(data: data,
                       options: options,
                       documentAttributes: nil)
    }
}