Swift pdf thumbnail

import PDFKit

func pdfThumbnail(url: URL, width: CGFloat = 240) -> UIImage? {
  guard let data = try? Data(contentsOf: url),
  let page = PDFDocument(data: data)?.page(at: 0) else {
    return nil
  }

  let pageSize = page.bounds(for: .mediaBox)
  let pdfScale = width / pageSize.width

  // Apply if you're displaying the thumbnail on screen
  let scale = UIScreen.main.scale * pdfScale
  let screenSize = CGSize(width: pageSize.width * scale, 
                          height: pageSize.height * scale)

  return page.thumbnail(of: screenSize, for: .mediaBox)
}

Source: stackoverflow.com

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