decode a url

viewController.swift

//
//  ViewController.swift
//  Test
//
//  Created by Wasim Alatrash on 1/28/20.
//  Copyright © 2020 Wasim Alatrash. All rights reserved.
//

import UIKit
import SafariServices

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    
    override func viewDidAppear(_ animated: Bool) {
        let url = "http://example.com/6f19bb7f-692c-ea11-bb54-000d3a609328/18/الألوان 1 2.docx"

        showAttachment(url: url, name: "test")
    }

    func showAttachment(url: String?, name: String){
        if let urlString = url,
            let url = URL(decode: urlString){
            let vc = SFSafariViewController(url: url)
            vc.title = name
            vc.modalPresentationStyle = .fullScreen
            present(vc, animated: true, completion: nil)
        }
    }

}

extension URL {
    init?(decode string: String) {
        guard let decoded = string.addingPercentEncoding(withAllowedCharacters: .urlFragmentAllowed) else { return nil }
        self.init(string: decoded)
    }
}