How to download file in swift

Question

I just started learning apple swift programming for iOS coming from android  I basically can now read and manipulate swift code and also learned some common classes used in iOS swift programming but still having some confusion with the syntax and everything    I m trying to download file  Like  lets just say coming from this URL  var url    http   www mywebsite com myfile pdf    in a button click  Maybe with visual progress too  Through searching here in stackoverflow  I stumbled upon Alamofire  I might try  it but I m not sure if this is the best way for me to do it   So  I would like to ask how and what are my options  iOS7 and iOS8  in achieving my goal  Also  pros and cons would be awesome

User · Answer

If you need to download only text file into String you can use this simple way, Swift 5:

let list = try? String(contentsOf: URL(string: "https://example.com/file.txt")!)

In case you want non optional result or error handling:

do {
    let list = try String(contentsOf: URL(string: "https://example.com/file.txt")!)
}
catch {
    // Handle error here
}

You should know that network operations may take some time, to prevent it from running in main thread and locking your UI, you may want to execute the code asynchronously, for example:

DispatchQueue.global().async {
    let list = try? String(contentsOf: URL(string: "https://example.com/file.txt")!)
}

User · Answer

iOS 13 Swift 5  5 1  IBAction func btnDownload   sender  Any                file location to save download file     let destination  DownloadRequest DownloadFileDestination          in         var documentsURL   FileManager default urls for   documentDirectory  in   userDomainMask  0          documentsURL appendPathComponent statementPDF          return  documentsURL    removePreviousFile                     Alamofire to download file     Alamofire download  quot http   pdf url quot   to  destination  responseData   response in         hideLoader           switch response result           case  success                 write something here             if response destinationURL    nil                   showAlertMessage titleStr  APPNAME  messageStr   quot File Saved in Documents  quot                                          case  failure              showAlertMessage titleStr  APPNAME  messageStr  response result error debugDescription                     Please add these permissions to info plist  so you will able to check the download file in Document Directory  lt key gt UIFileSharingEnabled lt  key gt   lt true  gt   lt key gt LSSupportsOpeningDocumentsInPlace lt  key gt   lt true  gt

User · Answer

A simple  robust and elegant download manager supporting simultaneous downloads with closure syntax for progress and completion tracking  Written in Swift with   Here     And Use like it   func downloadGIF url  String        let filename   url     let range  Range lt String Index gt    filename range of  media         let lastrange  Range lt String Index gt    filename range of   200w d        let finalPath   String filename range lowerBound   lt lastrange lowerBound       filename range lowerBound   lt lastrange lowerBound      let replaceFirstWords   finalPath replace string   media    replacement   SocialStatus GIF        let destinationUrl      replaceFirstWords  gif       let request   URLRequest url  URL string  imageData bg image        viewProgress isHidden   false     self btnDownload isHidden   true     setSharingButtonFalse       let downloadKey   self downloadManager downloadFile withRequest  request                                                          withName  destinationUrl                                                          shouldDownloadInBackground  true                                                          onProgress      weak self   progress  in                                                             self  viewProgress progress   CGFloat progress                                                              let val   progress   100                                                             print  val 1      val                                                                DispatchQueue main async                                                                   self  viewProgress setProgressText    Int val                                                                              weak self   error  url  in         if let error   error               print  Error     error as NSError                self  isDownloaded   false             self  viewProgress isHidden   true             self  setSharingButtonTrue               self  viewProgress setProgressText    0                print  handle error since couldn t save GIF             else               if let url   url                   self  isDownloaded   true                 self  saveGIFDownloaded                   self  viewProgress isHidden   true                 self  setSharingButtonTrue                   self  createAlbum                   self  saveGIF url  url absoluteURL

User · Answer

Use URLSessionDownloadTask to download files in background so that they can completed even if the app is terminated    For more information see   https   www ralfebert de snippets ios urlsession-background-downloads   It also shows how to implement progress monitoring for multiple tasks running in parallel

User · Answer

Background session  URLSessionDownloadTask  URLSessionUploadTask  allows you to download upload cache files in background mode even if app was terminated  In this case when task is done iOS wakes up it  in background  and allows make some competition block in a limited time frame  It is a part of background-transfers approach  It works because the downloading task is executed on nsurlsessiond daemon process About   Background tasks

User · Answer

Downloading a file in Swift 5 with progress reporting  encapsulated into a copy-paste friendly protocol-accessed class  protocol FileDownloadingDelegate  class       func updateDownloadProgressWith progress  Float      func downloadFinished localFilePath  URL      func downloadFailed withError error  Error     class FilesDownloader  NSObject  URLSessionDownloadDelegate       private weak var delegate  FileDownloadingDelegate       func download from url  URL  delegate  FileDownloadingDelegate            self delegate   delegate         let sessionConfig   URLSessionConfiguration background withIdentifier  url absoluteString     use this identifier to resume download after app restart         let session   Foundation URLSession configuration  sessionConfig  delegate  self  delegateQueue  nil          let task   session downloadTask with  url          task resume              func urlSession   session  URLSession  downloadTask  URLSessionDownloadTask  didFinishDownloadingTo location  URL            DispatchQueue main async   self delegate  downloadFinished localFilePath  location               func urlSession   session  URLSession  downloadTask  URLSessionDownloadTask  didWriteData bytesWritten  Int64  totalBytesWritten  Int64  totalBytesExpectedToWrite  Int64            DispatchQueue main async   self delegate  updateDownloadProgressWith progress  Float totalBytesWritten  Float totalBytesExpectedToWrite                func urlSession   session  URLSession  task  URLSessionTask  didCompleteWithError error  Error             guard let theError   error else   assertionFailure  quot something weird happened here quot    return           DispatchQueue main async   self delegate  downloadFailed withError  theError              How to use it  class MyViewController  UIViewController        private lazy var downloader   FilesDownloader        func downloadFile from url  URL            downloader download from  url  delegate  self            extension MyViewController  FileDownloadingDelegate       func updateDownloadProgressWith progress  Float               self downloadProgressView setProgress progress  animated  true             func downloadFinished tempFilePath  URL            print  quot downloaded to   tempFilePath  quot              resave the file into your desired place using             let dataFromURL   NSData contentsOf  location             dataFromURL  write to  yourDesiredFileUrl  atomically  true             func downloadFailed withError error  Error               handle the error

User · Answer

Swift 3  you want to download file bite by bite  and show in progress view  so you want to try this code  import UIKit  class ViewController  UIViewController URLSessionDownloadDelegate UIDocumentInteractionControllerDelegate         IBOutlet weak var img  UIImageView       IBOutlet weak var btndown  UIButton      var urlLink  URL      var defaultSession  URLSession      var downloadTask  URLSessionDownloadTask        var backgroundSession  URLSession       IBOutlet weak var progress  UIProgressView      override func viewDidLoad             super viewDidLoad               Do any additional setup after loading the view  typically from a nib           let backgroundSessionConfiguration   URLSessionConfiguration background withIdentifier   backgroundSession           defaultSession   Foundation URLSession configuration  backgroundSessionConfiguration  delegate  self  delegateQueue  OperationQueue main          progress setProgress 0 0  animated  false             func startDownloading              let url   URL string   http   publications gbdirect co uk c book thecbook pdf            downloadTask   defaultSession downloadTask with  url          downloadTask resume               IBAction func btndown   sender  UIButton             startDownloading               func showFileWithPath path  String           let isFileFound Bool    FileManager default fileExists atPath  path          if isFileFound    true              let viewer   UIDocumentInteractionController url  URL fileURLWithPath  path               viewer delegate   self             viewer presentPreview animated  true                            MARK - URLSessionDownloadDelegate     func urlSession   session  URLSession  downloadTask  URLSessionDownloadTask  didFinishDownloadingTo location  URL             print downloadTask          print  File download succesfully            let path   NSSearchPathForDirectoriesInDomains FileManager SearchPathDirectory documentDirectory  FileManager SearchPathDomainMask userDomainMask  true          let documentDirectoryPath String   path 0          let fileManager   FileManager           let destinationURLForFile   URL fileURLWithPath  documentDirectoryPath appendingFormat   file pdf             if fileManager fileExists atPath  destinationURLForFile path               showFileWithPath path  destinationURLForFile path              print destinationURLForFile path                    else              do                   try fileManager moveItem at  location  to  destinationURLForFile                     show file                 showFileWithPath path  destinationURLForFile path               catch                  print  An error occurred while moving file to destination url                                         func urlSession   session  URLSession  downloadTask  URLSessionDownloadTask  didWriteData bytesWritten  Int64  totalBytesWritten  Int64  totalBytesExpectedToWrite  Int64            progress setProgress Float totalBytesWritten  Float totalBytesExpectedToWrite   animated  true             func urlSession   session  URLSession  task  URLSessionTask  didCompleteWithError error  Error             downloadTask   nil         progress setProgress 0 0  animated  true          if  error    nil                print  didCompleteWithError   error  localizedDescription     no value                       else               print  The task finished successfully                        func documentInteractionControllerViewControllerForPreview   controller  UIDocumentInteractionController  - gt  UIViewController               return self            override func didReceiveMemoryWarning             super didReceiveMemoryWarning              Dispose of any resources that can be recreated              use of this code you want to download file store automatically in Document Directory in your application  this code 100  Working

User · Answer

Swift 3 class ViewController  UIViewController       var urlLink  URL      var defaultSession  URLSession      var downloadTask  URLSessionDownloadTask        MARK  Button Pressed      IBAction func btnDownloadPressed   sender  UIButton            let urlLink1   URL init string   quot https   github com VivekVithlani QRCodeReader archive master zip quot           startDownloading url  urlLink          IBAction func btnResumePressed   sender  UIButton        downloadTask resume       IBAction func btnStopPressed   sender  UIButton        downloadTask cancel       IBAction func btnPausePressed   sender  UIButton        downloadTask suspend          func startDownloading  url URL            let backgroundSessionConfiguration   URLSessionConfiguration background withIdentifier   quot backgroundSession quot           defaultSession   Foundation URLSession configuration  backgroundSessionConfiguration  delegate  self  delegateQueue  OperationQueue main          downloadProgress setProgress 0 0  animated  false          downloadTask   defaultSession downloadTask with  urlLink          downloadTask resume             MARK - URLSessionDownloadDelegate func urlSession   session  URLSession  downloadTask  URLSessionDownloadTask  didFinishDownloadingTo location  URL        print  quot File download succesfully quot      func urlSession   session  URLSession  downloadTask  URLSessionDownloadTask  didWriteData bytesWritten  Int64  totalBytesWritten  Int64  totalBytesExpectedToWrite  Int64        downloadProgress setProgress Float totalBytesWritten  Float totalBytesExpectedToWrite   animated  true     func urlSession   session  URLSession  task  URLSessionTask  didCompleteWithError error  Error         downloadTask   nil     downloadProgress setProgress 0 0  animated  true      if  error    nil            print  quot didCompleteWithError   error  localizedDescription  quot             else           print  quot The task finished successfully quot

User · Answer

You can also use a third party library that makes life easy  like Just  Just get  http   www mywebsite com myfile pdf     More awesome Swift stuff here https   github com matteocrippa awesome-swift

User · Answer

Yes you can very easily downloads Files from the remote Url Using this code  This Code is working Fine for Me   func DownlondFromUrl          Create destination URL  let documentsUrl URL    FileManager default urls for   documentDirectory  in   userDomainMask  first as URL  let destinationFileUrl   documentsUrl appendingPathComponent  downloadedFile jpg      Create URL to the source file you want to download let fileURL   URL string   https   s3 amazonaws com learn-swift IMG 0001 JPG    let sessionConfig   URLSessionConfiguration default let session   URLSession configuration  sessionConfig   let request   URLRequest url fileURL    let task   session downloadTask with  request     tempLocalUrl  response  error  in     if let tempLocalUrl   tempLocalUrl  error    nil              Success         if let statusCode    response as  HTTPURLResponse   statusCode               print  Successfully downloaded  Status code    statusCode                       do               try FileManager default copyItem at  tempLocalUrl  to  destinationFileUrl            catch  let writeError                print  Error creating a file   destinationFileUrl      writeError                     else           print  Error took place while downloading a file  Error description       error  localizedDescription           task resume

User · Answer

Here s an example that shows how to do sync  amp  async    import Foundation  class HttpDownloader        class func loadFileSync url  NSURL  completion  path String  error NSError   - gt  Void            let documentsUrl    NSFileManager defaultManager   URLsForDirectory  DocumentDirectory  inDomains   UserDomainMask  first as  NSURL         let destinationUrl   documentsUrl URLByAppendingPathComponent url lastPathComponent           if NSFileManager   fileExistsAtPath destinationUrl path                 println  file already exists    destinationUrl path                  completion path  destinationUrl path   error nil            else if let dataFromURL   NSData contentsOfURL  url               if dataFromURL writeToURL destinationUrl  atomically  true                    println  file saved    destinationUrl path                      completion path  destinationUrl path   error nil                else                   println  error saving file                   let error   NSError domain  Error saving file   code 1001  userInfo nil                  completion path  destinationUrl path   error error                          else               let error   NSError domain  Error downloading file   code 1002  userInfo nil              completion path  destinationUrl path   error error                       class func loadFileAsync url  NSURL  completion  path String  error NSError   - gt  Void            let documentsUrl    NSFileManager defaultManager   URLsForDirectory  DocumentDirectory  inDomains   UserDomainMask  first as  NSURL         let destinationUrl   documentsUrl URLByAppendingPathComponent url lastPathComponent           if NSFileManager   fileExistsAtPath destinationUrl path                 println  file already exists    destinationUrl path                  completion path  destinationUrl path   error nil            else               let sessionConfig   NSURLSessionConfiguration defaultSessionConfiguration               let session   NSURLSession configuration  sessionConfig  delegate  nil  delegateQueue  nil              let request   NSMutableURLRequest URL  url              request HTTPMethod    GET              let task   session dataTaskWithRequest request  completionHandler     data  NSData   response  NSURLResponse   error  NSError   - gt  Void in                 if  error    nil                        if let response   response as  NSHTTPURLResponse                           println  response   response                            if response statusCode    200                               if data writeToURL destinationUrl  atomically  true                                    println  file saved    destinationUrl path                                      completion path  destinationUrl path   error error                                else                                   println  error saving file                                   let error   NSError domain  Error saving file   code 1001  userInfo nil                                  completion path  destinationUrl path   error error                                                                                                                  else                       println  Failure    error localizedDescription                         completion path  destinationUrl path   error error                                               task resume                       Here s how to use it in your code   let url   NSURL string   http   www mywebsite com myfile pdf    HttpDownloader loadFileAsync url  completion   path String  error NSError   in                 println  pdf downloaded to    path

User · Answer

Try This Code only Swift 3 0 First Create NS Object File  Copy this code in created File  import UIKit  class Downloader   NSObject  URLSessionDownloadDelegate        var url   URL         will be used to do whatever is needed once download is complete     var obj1   NSObject       init   obj1   NSObject                self obj1   obj1              is called once the download is complete     func urlSession   session  URLSession  downloadTask  URLSessionDownloadTask  didFinishDownloadingTo location  URL                  copy downloaded data to your documents directory with same names as source file         let documentsUrl    FileManager default urls for   documentDirectory  in   userDomainMask  first         let destinationUrl   documentsUrl  appendingPathComponent url  lastPathComponent          let dataFromURL   NSData contentsOf  location          dataFromURL  write to  destinationUrl  atomically  true             now it is time to do what is needed to be done after the download           obj1  callWhatIsNeeded                this is to track progress     private func URLSession session  URLSession  downloadTask  URLSessionDownloadTask  didWriteData bytesWritten  Int64  totalBytesWritten  Int64  totalBytesExpectedToWrite  Int64                      if there is an error during download this will be called     func urlSession   session  URLSession  task  URLSessionTask  didCompleteWithError error  Error                 if error    nil                          handle the error             print  Download completed with error    error  localizedDescription                            method to be called to download     func download url  URL                self url   url            download identifier can be customized  I used the  ulr absoluteString          let sessionConfig   URLSessionConfiguration background withIdentifier  url absoluteString          let session   Foundation URLSession configuration  sessionConfig  delegate  self  delegateQueue  nil          let task   session downloadTask with  url          task resume            then Copy Below Code And put code in place of you want to download file   object    http   www mywebsite com myfile pdf         let url1   URL string  object           Downloader url1  as NSObject  download url  url1

User · Answer

After trying a few of the above suggestions without success  Swift versions     I ended up using the official documentation  https   developer apple com documentation foundation url loading system downloading files from websites let downloadTask   URLSession shared downloadTask with  url        urlOrNil  responseOrNil  errorOrNil in        check for and handle errors           errorOrNil should be nil          responseOrNil should be an HTTPURLResponse with statusCode in 200   lt 299          guard let fileURL   urlOrNil else   return       do           let documentsURL   try             FileManager default url for   documentDirectory                                      in   userDomainMask                                      appropriateFor  nil                                      create  false          let savedURL   documentsURL appendingPathComponent fileURL lastPathComponent          try FileManager default moveItem at  fileURL  to  savedURL        catch           print   quot file error    error  quot           downloadTask resume

User · Answer

Here is the Swift 4 version   static func loadFileAsync url  URL  completion   escaping  String   Error   - gt  Void        let documentsUrl    FileManager default urls for   documentDirectory  in   userDomainMask  first       let destinationUrl   documentsUrl appendingPathComponent url lastPathComponent       if FileManager   fileExists atPath  destinationUrl path                completion destinationUrl path  nil            else               let session   URLSession configuration  URLSessionConfiguration default  delegate  nil  delegateQueue  nil          var request   URLRequest url  url          request httpMethod    GET          let task   session dataTask with  request  completionHandler                        data  response  error in             if error    nil                               if let response   response as  HTTPURLResponse                                       if response statusCode    200                                               if let data   data                                                       if let     try  data write to  destinationUrl  options  Data WritingOptions atomic                                                                completion destinationUrl path  error                                                            else                                                               completion destinationUrl path  error                                                                                  else                                                       completion destinationUrl path  error                                                                                              else                               completion destinationUrl path  error                                   task resume

User · Answer

Swift 4 and Swift 5 Version if Anyone still needs this   import Foundation  class FileDownloader        static func loadFileSync url  URL  completion   escaping  String   Error   - gt  Void                let documentsUrl   FileManager default urls for   documentDirectory  in   userDomainMask  first           let destinationUrl   documentsUrl appendingPathComponent url lastPathComponent           if FileManager   fileExists atPath  destinationUrl path                        print  File already exists    destinationUrl path                 completion destinationUrl path  nil                    else if let dataFromURL   NSData contentsOf  url                        if dataFromURL write to  destinationUrl  atomically  true                                print  file saved    destinationUrl path                     completion destinationUrl path  nil                            else                               print  error saving file                   let error   NSError domain  Error saving file   code 1001  userInfo nil                  completion destinationUrl path  error                                  else                       let error   NSError domain  Error downloading file   code 1002  userInfo nil              completion destinationUrl path  error                       static func loadFileAsync url  URL  completion   escaping  String   Error   - gt  Void                let documentsUrl    FileManager default urls for   documentDirectory  in   userDomainMask  first           let destinationUrl   documentsUrl appendingPathComponent url lastPathComponent           if FileManager   fileExists atPath  destinationUrl path                        print  File already exists    destinationUrl path                 completion destinationUrl path  nil                    else                       let session   URLSession configuration  URLSessionConfiguration default  delegate  nil  delegateQueue  nil              var request   URLRequest url  url              request httpMethod    GET              let task   session dataTask with  request  completionHandler                                data  response  error in                 if error    nil                                       if let response   response as  HTTPURLResponse                                               if response statusCode    200                                                       if let data   data                                                               if let     try  data write to  destinationUrl  options  Data WritingOptions atomic                                                                        completion destinationUrl path  error                                                                    else                                                                       completion destinationUrl path  error                                                                                              else                                                               completion destinationUrl path  error                                                                                                                  else                                       completion destinationUrl path  error                                               task resume                       Here is how to call this method  -  let url   URL string   http   www filedownloader com mydemofile pdf   FileDownloader loadFileAsync url  url      path  error  in     print  PDF File downloaded to     path

User · Answer

Devran s and djunod s solutions are working as long as your application is in the foreground  If you switch to another application during the download  it fails  My file sizes are around 10 MB and it takes sometime to download  So I need my download function works even when the app goes into background   Please note that I switched ON the  Background Modes   Background Fetch  at  Capabilities     Since completionhandler was not supported the solution is not encapsulated  Sorry about that   --Swift 2 3--  import Foundation  class Downloader   NSObject  NSURLSessionDownloadDelegate       var url   NSURL          will be used to do whatever is needed once download is complete     var yourOwnObject   NSObject       init yourOwnObject   NSObject                self yourOwnObject   yourOwnObject              is called once the download is complete     func URLSession session  NSURLSession  downloadTask  NSURLSessionDownloadTask  didFinishDownloadingToURL location  NSURL                  copy downloaded data to your documents directory with same names as source file         let documentsUrl    NSFileManager defaultManager   URLsForDirectory  DocumentDirectory  inDomains   UserDomainMask  first         let destinationUrl   documentsUrl  URLByAppendingPathComponent url  lastPathComponent           let dataFromURL   NSData contentsOfURL  location          dataFromURL  writeToURL destinationUrl  atomically  true             now it is time to do what is needed to be done after the download         yourOwnObject  callWhatIsNeeded                this is to track progress     func URLSession session  NSURLSession  downloadTask  NSURLSessionDownloadTask  didWriteData bytesWritten  Int64  totalBytesWritten  Int64  totalBytesExpectedToWrite  Int64                      if there is an error during download this will be called     func URLSession session  NSURLSession  task  NSURLSessionTask  didCompleteWithError error  NSError                 if error    nil                          handle the error             print  Download completed with error    error  localizedDescription                            method to be called to download     func download url  NSURL                self url   url            download identifier can be customized  I used the  ulr absoluteString          let sessionConfig   NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier url absoluteString          let session   NSURLSession configuration  sessionConfig  delegate  self  delegateQueue  nil          let task   session downloadTaskWithURL url          task resume             And here is how to call in --Swift 2 3--      let url   NSURL string   http   company com file txt       Downloader yourOwnObject  download url     --Swift 3--   class Downloader   NSObject  URLSessionDownloadDelegate    var url   URL     will be used to do whatever is needed once download is complete var yourOwnObject   NSObject   init   yourOwnObject   NSObject        self yourOwnObject   yourOwnObject      is called once the download is complete func urlSession   session  URLSession  downloadTask  URLSessionDownloadTask  didFinishDownloadingTo location  URL          copy downloaded data to your documents directory with same names as source file     let documentsUrl    FileManager default urls for   documentDirectory  in   userDomainMask  first     let destinationUrl   documentsUrl  appendingPathComponent url  lastPathComponent      let dataFromURL   NSData contentsOf  location      dataFromURL  write to  destinationUrl  atomically  true         now it is time to do what is needed to be done after the download     yourOwnObject  callWhatIsNeeded        this is to track progress private func URLSession session  URLSession  downloadTask  URLSessionDownloadTask  didWriteData bytesWritten  Int64  totalBytesWritten  Int64  totalBytesExpectedToWrite  Int64          if there is an error during download this will be called func urlSession   session  URLSession  task  URLSessionTask  didCompleteWithError error  Error         if error    nil                  handle the error         print  Download completed with error    error  localizedDescription                method to be called to download func download url  URL        self url   url        download identifier can be customized  I used the  ulr absoluteString      let sessionConfig   URLSessionConfiguration background withIdentifier  url absoluteString      let session   Foundation URLSession configuration  sessionConfig  delegate  self  delegateQueue  nil      let task   session downloadTask with  url      task resume        And here is how to call in --Swift 3--      let url   URL string   http   company com file txt       Downloader yourOwnObject  download url

User · Answer

Example downloader class without Alamofire   class Downloader       class func load URL  NSURL            let sessionConfig   NSURLSessionConfiguration defaultSessionConfiguration           let session   NSURLSession configuration  sessionConfig  delegate  nil  delegateQueue  nil          let request   NSMutableURLRequest URL  URL          request HTTPMethod    GET          let task   session dataTaskWithRequest request  completionHandler     data  NSData   response  NSURLResponse   error  NSError   - gt  Void in             if  error    nil                       Success                 let statusCode    response as NSHTTPURLResponse  statusCode                 println  Success    statusCode                        This is your file-variable                     data                           else                      Failure                 println  Failure       error localizedDescription                                    task resume             This is how to use it in your own code   class Foo       func bar             if var URL   NSURL string   http   www mywebsite com myfile pdf                 Downloader load URL                      Swift 3 Version  Also note to download large files on disk instead instead in memory  see  downloadTask   class Downloader       class func load url  URL  to localUrl  URL  completion   escaping    - gt                let sessionConfig   URLSessionConfiguration default         let session   URLSession configuration  sessionConfig          let request   try  URLRequest url  url  method   get           let task   session downloadTask with  request     tempLocalUrl  response  error  in             if let tempLocalUrl   tempLocalUrl  error    nil                      Success                 if let statusCode    response as  HTTPURLResponse   statusCode                       print  Success    statusCode                                       do                       try FileManager default copyItem at  tempLocalUrl  to  localUrl                      completion                     catch  let writeError                        print  error writing file   localUrl      writeError                                     else                   print  Failure       error  localizedDescription                                   task resume

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