Urlsession download file

 · I have an app that has to download multiple large files. I want it to download each file one by one sequentially instead of concurrently. When it runs concurrently the app gets overloaded and crashes. So. Im trying to wrap a downloadTaskWithURL inside a NSBlockOperation and then setting the maxConcurrentOperationCount = 1 on the queue.  · Starting downloads. To start a download that can be completed in background without the app running, create a URLSessionConfiguration for background processing. The identifier will identify the URLSession: if the process is terminated and later restarted, you can get the “same” URLSession f.e. to ask about the progress of downloads in progress.  · URLSession is designed to make network transfers as easy as possible, and a great example of that is its downloadTask()` method. This fetches the contents of a URL you specify, saves it to a local file, then calls a completion handler so you can manipulate the file – all in one/5(20).

Download Files using URLSessionDownloadTask. Here we are going to discuss how to download large files and save partial data even when the app is terminated and also updating the view when is in the background. Creating an object of URLSession. Create URL to the source file you want to download, Use URLSession to download a file from a remote URL, Copy downloaded file from a temporary URL to a destination URL on the device, Handle file download SUCCESS and ERROR situations. Download File From a Remote URL. Code Example in Swift 3. import UIKit. class ViewController: UIViewController {. URLSession enables you to download and upload files while the app is in the background. Basic instructions to get it working are often found. Jan 4, Starting background downloads using URLSession and DownloadTask; Starting file uploads using URLSession and DataTask; Deserializing server.

Download An Image or File From A URL. This post will use bltadwin.ruadTask(with:) to download a remote file from a url: let task = bltadwin.ruadTask(with: url) { (tempURL, response, error) in // Handle response, the download file is // at tempURL } // Start the download bltadwin.ru() Cache File or Image To Disk. To download files, you create a URLSession Download Task from a URLSession. If you don’t care about receiving progress updates or other delegate callbacks during the download, you can use a completion handler. URLSession enables you to download and upload files while the app is in the background. Basic instructions to get it working are often found online, but it’s hard to make it work as expected and debug the flows.