How to implement downloading files in the background for iOS? (Swift)

[VyacheslavBakinskiy]

Hello, I'm using file download from Dropbox in my app. It works fine when app is active, but if my app goes into the background the download stops. How can I fix it? I use this code to download:

private let client = DropboxClientsManager.authorizedClient

func downloadFile(_ file: TrackModelProtocol?, callback: @escaping () -> ()) {

        guard let path = file?.path, let pathComponent = file?.fileName else { return }

        if let client = client {

            let fileManager = FileManager.default

            let directoryURL = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]

            let destURL = directoryURL.appendingPathComponent(pathComponent)

            let destination: (URL, HTTPURLResponse) -> URL = { temporaryURL, response in

                return destURL

            }

            client.files.download(path: path, overwrite: true, destination: destination)

                .response { _ , error in

                    if let error = error{

                        print("Downloading from Dropbox fails: \(error)")

                        return

                    }

                    //Call some action after the download is complete

                    callback()

                }

        }

    }

[Greg-DB]

I'm closing this as a duplicate of: https/www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/Downloading-in-the-background-in-iOS-Swif...