Download file with right extension - ios

Question

Problem with downloading files.
I'm trying to download a file form url and push it into open/share modal. But da data downloads as Data and if I try saving it to File app it saves a file called Data.
I just need to download and share the file with the original extension. Like file.extension.
Here's the code use. I used Alamofire pod here:
AF.download(url).responseData { response in
if let preset = response.value {
let shareArray = [preset]
let activityViewController = UIActivityViewController(activityItems: shareArray , applicationActivities: nil)
activityViewController.popoverPresentationController?.sourceView = self.view
self.present(activityViewController, animated: true, completion: nil)
}
}
Also tried this code but the app crashed:
if let url = URL(string: downloadURL!) {
let task = URLSession.shared.downloadTask(with: url) { localURL, urlResponse, error in
if let localURL = localURL {
let shareArray = [localURL]
let activityViewController = UIActivityViewController(activityItems: shareArray , applicationActivities: nil)
activityViewController.popoverPresentationController?.sourceView = self.view
self.present(activityViewController, animated: true, completion: nil)
}
}
task.resume()
}

Answer 1

The issue there is that you are trying to share the temporary file returned. It has a dynamic UTI (Unified Type Identifier). You need to get the url response suggested file name and rename the file.
import UIKit
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true
extension URL {
var typeIdentifier: String? { (try? resourceValues(forKeys: [.typeIdentifierKey]))?.typeIdentifier }
}
let url = URL(string: "https://i.stack.imgur.com/varL9.jpg")!
URLSession.shared.downloadTask(with: url) { location, response, error in
guard let location = location,
let httpURLResponse = response as? HTTPURLResponse,
httpURLResponse.statusCode == 200 else { return }
let fileName = httpURLResponse.suggestedFilename ?? httpURLResponse.url?.lastPathComponent ?? url.lastPathComponent
let destination = FileManager.default.temporaryDirectory.appendingPathComponent(fileName)
do {
if FileManager.default.fileExists(atPath: destination.path) {
try FileManager.default.removeItem(at: destination)
}
print("location", location.typeIdentifier ?? "no UTI") // location dyn.ah62d4rv4ge81k5pu
try FileManager.default.moveItem(at: location, to: destination)
print("destination", destination.typeIdentifier ?? "no UTI") // destination public.jpeg
} catch {
print(error)
}
}.resume()

Answer 2

To complete the answer from #leo Dabus, there is a need to modify the destination URL further and append the file extension you desire by using
FileManager.default.moveItem(at:to:)
https://developer.apple.com/documentation/foundation/filemanager/1414750-moveitem
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
// create destination URL with the original pdf name
print("fileDownload: urlSession")
guard let url = downloadTask.originalRequest?.url else { return }
print("fileDownload: urlSession \(url)")
let documentsPath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
let destinationURL = documentsPath.appendingPathComponent(url.lastPathComponent)
// delete original copy
try? FileManager.default.removeItem(at: destinationURL)
// append a new extension type
let newURL = destinationURL.deletingPathExtension().appendingPathExtension("pdf")
// copy from temp to Document
try? FileManager.default.moveItem(at: destinationURL, to: newURL)
do {
try FileManager.default.copyItem(at: location, to: newURL)
myViewDocumentsmethod(PdfUrl:destinationURL)
print("fileDownload: downloadLocation", destinationURL)
} catch let error {
print("fileDownload: error \(error.localizedDescription)")
}
}