how to still show the progress of progressView after reloading the view controller?

Question

this is my first question on swift, i couldn't really find any answer in the internet. i have a download button that download a pdf file from url, and there is a progressView that shows the progress of downloading to the user. everything works fine but when i download the file and reload the view controller the progress of progressView is resets to zero. how can i still show the progress of downloading even after reloading the viewController.

I'm passing the url from another viewController

please help me.

this is my code

class CellDetailsViewController: UIViewController , URLSessionDownloadDelegate{

    var download = ""
    var downloadTask : URLSessionDownloadTask!

   override func viewDidLoad() {
        super.viewDidLoad()

    }

    @IBAction func download(_ sender: Any) {
        guard let url = URL(string: download)else {return}
        let urlSession = URLSession(configuration: .default, delegate: self, delegateQueue: OperationQueue())
         downloadTask = urlSession.downloadTask(with: url)
        downloadTask.resume()
        print("downloading")
    }


    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
        print("download Location", location)
        let fileManager = FileManager.default
        let documentPath = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]
        let PdfName = documentPath.appendingPathComponent("\(name).pdf")
        try? fileManager.removeItem(at: PdfName)
        do{
            try fileManager.moveItem(at: location, to: PdfName)
        }catch{
            print("copy error\(error.localizedDescription)")
        }
    }


    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
        
        if totalBytesExpectedToWrite > 0 {
            let progress = Float(totalBytesWritten) / Float(totalBytesExpectedToWrite)
            DispatchQueue.main.async {
                self.progressView.progress = progress
                print(totalBytesExpectedToWrite)
                if progress == 1 {
                    self.progressView.isHidden = true
                }
            }
        }
    }

}

score 3 · Accepted Answer · answered Nov 25 '20 at 21:44

You can store a static variable in a struct somewhere else. I would create a new file that you can store in a "Model" folder and do something like this:

struct staticVariableStorage {
static var fileProgress : Double = 0.0 }

and then you could access it in your code by setting a new value to

staticVariableStorage.fileProgress

This shouldn't be affected by resetting the ViewController seeing as it would be separate from the ViewController in the first place.

how to still show the progress of progressView after reloading the view controller?

1 Answers1