Как отобразить PDF-файл с Google Диска, используя ссылку в Swift

Question

Я пытаюсь отобразить PDF-файл (который хранится на Google Диске) в быстрой (если это возможно) без загрузки. Например, ссылка на мой pdf-файл на Google Диске выглядит следующим образом:

https://drive.google.com/file/d/1XYR3tTBHSAI7tKmQLa7bawCmALMCYiu6/view?usp=sharing/deneme.pdf

Я хочу отобразить этот pdf-файл в формате swift (если это возможно)без скачивания. Мой код ViewController такой:

import UIKit


class MalzemeHareketVC: UIViewController  {


override func viewDidLoad() {
    super.viewDidLoad()


   let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
    button.backgroundColor = .green
    button.setTitle("PDF", for: .normal)
    button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)

   self.view.addSubview(button)
}

@objc func buttonAction(sender: UIButton!) {
    guard let path = URL(string: "https://drive.google.com/file/d/1XYR3tTBHSAI7tKmQLa7bawCmALMCYiu6/view?usp=sharing/deneme.pdf") else {
        print("could not read")
        return }

  let pdfViewController = PDFViewController(pdfUrl: path)
  present(pdfViewController, animated: true, completion: nil)
}

}

, и я добавил один viewcontroller и один tableviewcontroller. Коды viewcontroller выглядят так:

import UIKit
import PDFKit

class PDFViewController: UIViewController {

private let pdfUrl: URL
private let document: PDFDocument!
private let outline: PDFOutline?
private var pdfView = PDFView()
private var thumbnailView = PDFThumbnailView()
private var outlineButton = UIButton()
private var dismissButton = UIButton()

init(pdfUrl: URL) {
    self.pdfUrl = pdfUrl
    self.document = PDFDocument(url: pdfUrl)
    self.outline = document.outlineRoot
    pdfView.document = document
    super.init(nibName: nil, bundle: nil)
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = .white
    setupPDFView()
    setupDismissButton()
    setupThumbnailView()
    setupOutlineButton()
}

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    pdfView.frame = view.safeAreaLayoutGuide.layoutFrame
    let thumbanilHeight: CGFloat = 120
    thumbnailView.translatesAutoresizingMaskIntoConstraints = false
    view.addConstraintsWithFormat(format: "H:|[v0]|", views: thumbnailView)
    view.addConstraintsWithFormat(format: "V:[v0(\(thumbanilHeight))]|", views: thumbnailView)
}

private func setupPDFView() {
    view.addSubview(pdfView)
    pdfView.displayDirection = .horizontal
    pdfView.usePageViewController(true)
    pdfView.pageBreakMargins = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
    pdfView.autoScales = true

    let touch = UITapGestureRecognizer(target: self, action: #selector(toggleTools))
    pdfView.addGestureRecognizer(touch)
}

@objc func toggleTools() {
    if outlineButton.alpha != 0 {
        UIView.animate(withDuration: 0.3, animations: {
            self.outlineButton.alpha = 0
            self.thumbnailView.alpha = 0
            self.dismissButton.alpha = 0
        }, completion: nil)
    } else {
        UIView.animate(withDuration: 0.3, animations: {
            self.outlineButton.alpha = 1
            self.thumbnailView.alpha = 1
            self.dismissButton.alpha = 1
        }, completion: nil)
    }
}

private func setupDismissButton() {
    dismissButton = UIButton(frame: CGRect(x: 30, y: 45, width: 60, height: 60))
    dismissButton.layer.cornerRadius = dismissButton.frame.width/2
    dismissButton.setTitle("X", for: .normal)
    dismissButton.titleLabel?.font = UIFont(name: "AppleSDGothicNeo-Bold", size: 30)
    dismissButton.titleEdgeInsets = UIEdgeInsets(top: 5, left: 0, bottom: 0, right: 0)
    dismissButton.setTitleColor(.white, for: .normal)
    dismissButton.backgroundColor = .black
    dismissButton.alpha = 0.8
    view.addSubview(dismissButton)
    dismissButton.addTarget(self, action: #selector(back), for: .touchUpInside)
}

@objc private func back() {
    self.dismiss(animated: true, completion: nil)
}

private func setupThumbnailView() {
    thumbnailView.pdfView = pdfView
    thumbnailView.backgroundColor = UIColor(displayP3Red: 179/255, green: 179/255, blue: 179/255, alpha: 0.5)
    thumbnailView.layoutMode = .horizontal
    thumbnailView.thumbnailSize = CGSize(width: 80, height: 100)
    thumbnailView.contentInset = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 10)
    view.addSubview(thumbnailView)
}

private func setupOutlineButton() {
    outlineButton = UIButton(frame: CGRect(x: view.frame.maxX - 90, y: 45, width: 60, height: 60))
    outlineButton.layer.cornerRadius = outlineButton.frame.width/2
    outlineButton.setTitle("三", for: .normal)
    outlineButton.titleLabel?.font = UIFont(name: "AppleSDGothicNeo-Bold", size: 30)
    outlineButton.titleEdgeInsets = UIEdgeInsets(top: 5, left: 0, bottom: 0, right: 0)
    outlineButton.setTitleColor(.white, for: .normal)
    outlineButton.backgroundColor = .black
    outlineButton.alpha = 0.8
    view.addSubview(outlineButton)
    outlineButton.addTarget(self, action: #selector(toggleOutline(sender:)), for: .touchUpInside)
}

@objc private func toggleOutline(sender: UIButton) {

    guard let outline = self.outline else {
        print("PDF has no outline")
        return
    }

    let outlineViewController = OutlineTableViewController(outline: outline, delegate: self)
    outlineViewController.preferredContentSize = CGSize(width: 300, height: 400)
    outlineViewController.modalPresentationStyle = UIModalPresentationStyle.popover

    let popoverPresentationController = outlineViewController.popoverPresentationController
    popoverPresentationController?.sourceView = outlineButton
    popoverPresentationController?.sourceRect = CGRect(x: sender.frame.width/2, y: sender.frame.height, width: 0, height: 0)
    popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.up
    popoverPresentationController?.delegate = self

    self.present(outlineViewController, animated: true, completion: nil)
}
}

extension PDFViewController: OutlineDelegate {
    func goTo(page: PDFPage) {
        pdfView.go(to: page)
    }
}

extension PDFViewController: UIPopoverPresentationControllerDelegate {
    func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
        return .none
    }
}

extension UIView {
    func addConstraintsWithFormat(format: String, views: UIView...) {
        var viewsDictionary = [String: UIView]()
        for (index, view) in views.enumerated() {
            let key = "v\(index)"
            view.translatesAutoresizingMaskIntoConstraints = false
            viewsDictionary[key] = view
        }
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: format, options: NSLayoutConstraint.FormatOptions(), metrics: nil, views: viewsDictionary))
    }
}

коды tableviewcontroller выглядят так:

    import UIKit
import PDFKit

protocol OutlineDelegate: class {
    func goTo(page: PDFPage)
}

class OutlineTableViewController: UITableViewController {

    let outline: PDFOutline
    weak var delegate: OutlineDelegate?

    init(outline: PDFOutline, delegate: OutlineDelegate?) {
        self.outline = outline
        self.delegate = delegate
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return outline.numberOfChildren
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell =
            tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as UITableViewCell
        if let label = cell.textLabel, let title = outline.child(at: indexPath.row)?.label {
            label.text = String(title)
        }
        return cell
    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if let page = outline.child(at: indexPath.row)?.destination?.page {
            delegate?.goTo(page: page)
        }
    }

}

в результате, когда я нажимаю кнопку PDF, «не удалось прочитать» напечатано. но если я хочу отобразить внутренний pdf-файл, например, я копирую прошлый файл deneme.pdf в свой проект и изменяю путь следующим образом:

guard let path = Bundle.main.url(forResource: "deneme", withExtension: "pdf")

, я могу отлично отобразить pdf-файл. Я не хочу скачивать и хранить PDF-файл, я просто хочу показать. Если это невозможно, то как временно скачать с Google Drive ссылку.