How to update a specific cell label using MZDownloadManager even if user move to any ViewController and came back - ios

Question

I'm using MZDownloadManger library to download the files using url, every thing is working fine except the label update, when i start the downloading it changes to "Starting Downloading" then starts its progress like 10% 20% etc. its working fine but when i move to any other view controller its progress stops and not update the label value to "Downloaded". i have set a flag in my local data base '0' and '1', 0 means not downloaded and 1 means downloaded.
here is the code when a user select the cell and hit for download:
func keepOfflineFiles(sender: UIButton) {
if files[sender.tag].onLocal == "1"{
self.displayAlert(title: AlertTitle.alert, message: AlertMsg.alreadyDownloaded)
} else{
if self.files[sender.tag].status == "on amazon"{
let indexPath = IndexPath.init(row: sender.tag, section: 0)
let cell = self.tblFilesPro.cellForRow(at: indexPath)
if let cell = cell {
let downloadCell = cell as! filesTableViewCell
downloadCell.lblDetailsPro.text = "Starting Download. . ."
}
let pathString:String = ""
let fileName:String = self.files[sender.tag].file_id! + self.files[sender.tag].Extension!
if(fileName != ""){
let local_url = NSURL(fileURLWithPath: pathString.getDocumentsPath())
let filePath = local_url.appendingPathComponent(fileName)?.path
let fileManager = FileManager.default
if fileManager.fileExists(atPath: filePath!) {
// FILE AVAILABLE
let indexPath = IndexPath.init(row: sender.tag, section: 0)
let cell = self.tblFilesPro.cellForRow(at: indexPath)
if let cell = cell {
let downloadCell = cell as! filesTableViewCell
downloadCell.lblDetailsPro.text = "Downloaded"
}
self.fileid = self.files[sender.tag].file_id!
self.updateFileStatusToRealm()
//self.displayAlert(title: AlertTitle.alert, message: AlertMsg.alreadyDownloaded)
} else {
// FILE NOT AVAILABLE
let completeUrl:String = Tray.downloadURLBasePath + self.files[sender.tag].fileLink!
if(self.verifyUrl(urlString: completeUrl)) {
self.fileid = self.files[sender.tag].file_id!
let index:String = String(sender.tag)
self.AppDelegateObj.downloadManager.addDownloadTask(fileName as String, fileURL: completeUrl as String, destinationPath: index as String)
}
}
}
}else{
self.displayAlert(title: AlertTitle.alert, message: AlertMsg.inArchiveProcess)
}
}
}
here are the delegates of MZDownloadManager that i called in AppDelegate
To update the progress
func downloadRequestDidUpdateProgress(_ downloadModel: MZDownloadModel, index: Int) {
let root : UINavigationController = self.window?.rootViewController as! UINavigationController
if let master = root.topViewController as? TabBarController {
if let nav = master.viewControllers?[0] as? FilesVC {
nav.refreshCellForIndex(downloadModel, index: Int(downloadModel.destinationPath)!)
}
} else {
print("Somthing went wrong while downloading this file.")
}
}
When downloading finished
func downloadRequestFinished(_ downloadModel: MZDownloadModel, index: Int) {
let root : UINavigationController = self.window!.rootViewController! as! UINavigationController
if let master = root.topViewController as? TabBarController {
if let nav = master.viewControllers![0] as? FilesVC{
nav.getDownloadingStatusOfCellForIndex(downloadModel, index: Int(downloadModel.destinationPath)!)
}
} else {
print("Somthing went wrong while finishing downloading of this file.")
}
}
Method to refresh the cell label
func refreshCellForIndex(_ downloadModel: MZDownloadModel, index: Int) {
let indexPath = IndexPath.init(row: index, section: 0)
let cell = self.tblFilesPro.cellForRow(at: indexPath)
if let cell = cell {
let downloadCell = cell as? filesTableViewCell
downloadCell?.updateCellForRowAtIndexPath(indexPath, downloadModel: downloadModel)
}
}
Method to get the cell and change value
func getDownloadingStatusOfCellForIndex(_ downloadModel: MZDownloadModel, index: Int) {
let indexPath = IndexPath.init(row: index, section: 0)
let cell = self.tblFilesPro.cellForRow(at: indexPath)
if let cell = cell {
let downloadCell = cell as? filesTableViewCell
downloadCell?.lblDetailsPro.text = "Downloaded"
self.fileid = self.files[index].file_id!
self.updateFileStatusToRealm()
}
}
here is the method which change the flag value 0 to 1 in database:
func updateFileStatusToRealm(){
let fileToUpdate = uiRealm.objects(filesDataTable.self).filter("file_id = %#", self.fileid)
let realm = try! Realm()
if let file = fileToUpdate.first {
try! realm.write {
file.onLocal = "1"
tblFilesPro.reloadData()
}
}
}