Download PDF file and save in document directory - ios

Question

I have the following code that allows me to download a PDF file from a URL, it works correctly:
class ViewController: UIViewController {
#IBOutlet weak var progressView: UIProgressView!
override func viewDidLoad() {
let _ = DownloadManager.shared.activate()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
DownloadManager.shared.onProgress = { (progress) in
OperationQueue.main.addOperation {
self.progressView.progress = progress
}
}
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
DownloadManager.shared.onProgress = nil
}
#IBAction func startDownload(_ sender: Any) {
let url = URL(string: "https://d0.awsstatic.com/whitepapers/KMS-Cryptographic-Details.pdf")!
let task = DownloadManager.shared.activate().downloadTask(with: url)
task.resume()
}
}
The file is currently going to: file:///Users/cybermac/Library/Developer/CoreSimulator/Devices/CAEC75D0-423A-4FB2-B0D6-9E7CADB190A1/data/Containers/Data/Application/8B5CBFC8-7058-48DB-A1C4-872302A80610/Library/Caches/com.apple.nsurlsessiond/Downloads/com.example.DownloadTaskExample/CFNetworkDownload_Q7OVlf.tmp
How do I save it in /Documents/?
Something like this: file:///Users/cybermac/Library/Developer/CoreSimulator/Devices/CAEC75D0-423A-4FB2-B0D6-9E7CADB190A1/data/Containers/Data/Application/64370B29-2C01-470F-AE76-17EF1A7BC918/Documents/
The idea is that the file saved in that directory can be used to read it offline (with PDFKit or webKit). It will only be deleted if the application is deleted.

Answer 1

You need to move the file to your custom location after the download. Implement URLSessionDownloadDelegate and you will receive the location of your downloaded file.
Delegate method:
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL)
Code to move the file:
do {
let documentsURL = try
FileManager.default.url(for: .documentDirectory,
in: .userDomainMask,
appropriateFor: nil,
create: false)
let savedURL = documentsURL.appendingPathComponent("yourCustomName.pdf")
try FileManager.default.moveItem(at: location, to: savedURL)
} catch {
print ("file error: \(error)")
}
To learn more refer to this repo.

Answer 2

This snippet was downloaded your Remote PDF from Server and "Save" into your Photo Library
func drawPDFfromURL(url: URL) -> UIImage? {
guard let document = CGPDFDocument(url as CFURL) else { return nil }
guard let page = document.page(at: 1) else { return nil }
let pageRect = page.getBoxRect(.mediaBox)
let renderer = UIGraphicsImageRenderer(size: pageRect.size)
let img = renderer.image { ctx in
UIColor.white.set()
ctx.fill(pageRect)
ctx.cgContext.translateBy(x: 0.0, y: pageRect.size.height)
ctx.cgContext.scaleBy(x: 1.0, y: -1.0)
ctx.cgContext.drawPDFPage(page)
}
return img
}
step 2
UIImageWriteToSavedPhotosAlbum(drawPDFfromURL(url: url!) ?? UIImage(), nil, nil, nil)