下载停止时关闭ViewController

Question

我正在使用Cheapjack Library (iOS)下载我的应用程序在Swift中的文件。我从另一个班级排队下载。这似乎工作正常，下载排队并开始下载。但是，当下载发生的“DownloadsViewController”未显示时，文件完成下载时不会执行didiFinishDownload块。关于如何处理我的错误的任何想法。 另外，当我打开下载视图控制器并解雇它时，下载会挂起它的位置，当我解除ViewController 任何想法？

这里是我的代码：如果您关闭它

//Adding download from another class 
let downloadItem = DownloadsTableViewCellItem(identifier: identifier, urlString: url3, infoLabelTitle: info, stateLabelTitle: "Downloading...", progressLabelTitle: "", action: DownloadsTableViewCellAction.Pause) 
     DownloadsViewController().addDownloadItem(downloadItem, withIdentifier: identifier) 

//Receiving download in DownloadsViewController 
func addDownloadItem(downloadItem: DownloadsTableViewCellItem, withIdentifier identifier: CheapjackFile.Identifier) { 

     downloadItems[identifier] = downloadItem 
     identifiers.append(identifier) 

     CheapjackManager.sharedManager.download(downloadItem.url(), identifier: identifier) 
     self.tableView.reloadData() 

    } 

//DidFinishBlock 
func cheapjackManager(manager: CheapjackManager, didFinishDownloading withSession: NSURLSession, downloadTask: NSURLSessionDownloadTask, url: NSURL, forFile file: CheapjackFile) { 
     dispatch_async(dispatch_get_main_queue()) { 
     print("Did finish downloading file") 
     SongsTableViewController().tableView.reloadData() 

      let filemanager = NSFileManager.defaultManager() 
      let documentsPath : AnyObject = NSSearchPathForDirectoriesInDomains(.DocumentDirectory,.UserDomainMask,true)[0] 
      print("DocumentsPath: \(documentsPath)") 
     let randomUUID: String = NSUUID().UUIDString + ".mp3" 
     let destinationPath = documentsPath.stringByAppendingString("/" + randomUUID) 
      print("DestinationPath: \(destinationPath)") 


      if (!filemanager.fileExistsAtPath(destinationPath as String)) { 

       let url1 = file.request.URL 
       print("URL1: \(url1)") 
       print("Temp Loc: \(String(url))") 

       let data = NSData(contentsOfURL: url) 

       if (data != nil) { 



         data!.writeToFile(destinationPath, atomically: false) 
         //data!.writeToURL(NSURL(string:destinationPath)!, atomically: false) 

          print("The music files has been saved.") 


         let appDel: AppDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate) 

         let fetchRequest = NSFetchRequest(entityName: "Track") 
         fetchRequest.predicate = NSPredicate(format: "url = %@", String(url1!)) 

         let context = appDel.managedObjectContext 

         do { 

          let results = try context.executeFetchRequest(fetchRequest) 

          fetchResults = results as! [NSManagedObject] 

          if fetchResults.count != 0 { 

           let managedObject = fetchResults[0] 
           managedObject.setValue(destinationPath, forKey: "fileURL") 

           appDel.saveContext() 

           SongsTableViewController().fetchData() 

          } else { 

           print("No track found") 
          } 

         } catch let error as NSError { 
          print("Could not fetch \(error), \(error.userInfo)") 
        } 

       } 
      } else { 
       print("The files already exist") 
      } 
     } 
} 

Answer 1

DownloadsViewController将DEINIT。

请注意，delegate的CheapjackManager是weak。在您解雇DownloadsViewController后，delegate将被设置为零，任何呼叫delegate都将被忽略，包括cheapjackManager:didiFinishDownload:。

与此同时，CheapjackManager仍在为您下载资源。只是不能在DownloadsViewController中观察它。