class ViewController: UIViewController,UIDocumentInteractionControllerDelegate
{
let documentInteractionController = UIDocumentInteractionController(url: URL(fileURLWithPath: path))
documentInteractionController.delegate = self
documentInteractionController.presentPreview(animated: true)
}
func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController
{
return self
}
above code i try on my apps, when click left menu , not able to show the pdf file. anyone got idea ?
I am showing here an example for download pdf from url link displaying in UIdocumentInteractionController in swift 4 as per your requirement
class ExampleViewController: UIViewController, URLSessionDownloadDelegate, UIDocumentInteractionControllerDelegate {
let urlLink = "sample link";
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func btnDownArrowOnPressed(_ sender: UIButton) {
if(urlLink != nil){
if(urlLink != nil && urlLink != "Null" && urlLink != ""){
let backgroundSessionConfiguration = URLSessionConfiguration.background(withIdentifier: "backgroundSession")
backgroundSession = Foundation.URLSession(configuration: backgroundSessionConfiguration, delegate: self, delegateQueue: OperationQueue.main)
let url = URL(string: urlLink!
downloadTask = backgroundSession.downloadTask(with: url)
downloadTask.resume()
}else{
self.view.makeToast("You don't have any certificate to download.")
}
}
else{
self.view.makeToast("You don't have any certificate to download.")
}
}
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)
}
}
func urlSession(_ session: URLSession,
downloadTask: URLSessionDownloadTask,
didFinishDownloadingTo location: URL){
let path = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
let documentDirectoryPath:String = path[0]
let fileManager = FileManager()
let destinationURLForFile = URL(fileURLWithPath: documentDirectoryPath.appendingFormat("/Certificate.pdf"))
if fileManager.fileExists(atPath: destinationURLForFile.path){
showFileWithPath(path: 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")
}
}
}
// 2
func urlSession(_ session: URLSession,
downloadTask: URLSessionDownloadTask,
didWriteData bytesWritten: Int64,
totalBytesWritten: Int64,
totalBytesExpectedToWrite: Int64){
}
//MARK: URLSessionTaskDelegate
func urlSession(_ session: URLSession,
task: URLSessionTask,
didCompleteWithError error: Error?){
downloadTask = nil
if (error != nil) {
print(error!.localizedDescription)
}else{
self.view.hideToastActivity()
print("The task finished transferring data successfully")
}
}
//MARK: UIDocumentInteractionControllerDelegate
func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController
{
UINavigationBar.appearance().tintColor = UIColor.white
return self
}
}
Use URL(string: path) instead of URL(fileURLWithPath: path)
Related
I am trying to implement this code below to catch PDF downloads inside a WKWebView:
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: #escaping (WKNavigationActionPolicy) -> Void) {
if let url = navigationAction.request.url {
print("fileDownload: check :: \(url)")
let extention = "\(url)".suffix(4)
if extention == ".pdf" {
print("fileDownload: redirect to download events. \(extention)")
DispatchQueue.main.async {
self.downloadPDF(tempUrl: "\(url)")
}
decisionHandler(.cancel)
return
}
}
decisionHandler(.allow)
}
func downloadPDF(tempUrl:String){
print("fileDownload: downloadPDF")
guard let url = URL(string: tempUrl) else { return }
let urlSession = URLSession(configuration: .default, delegate: self, delegateQueue: OperationQueue())
let downloadTask = urlSession.downloadTask(with: url)
downloadTask.resume()
//showHUD(isShowBackground: true); //show progress if you need
}
func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
print("fileDownload: documentInteractionControllerViewControllerForPreview")
return self
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
// create destination URL with the original pdf name
print("fileDownload: urlSession")
guard let url = downloadTask.originalRequest?.url else { return }
print("fileDownload: urlSession \(url)")
let documentsPath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
let destinationURL = documentsPath.appendingPathComponent(url.lastPathComponent)
// delete original copy
try? FileManager.default.removeItem(at: destinationURL)
// copy from temp to Document
do {
try FileManager.default.copyItem(at: location, to: destinationURL)
myViewDocumentsmethod(PdfUrl:destinationURL)
print("fileDownload: downloadLocation", destinationURL)
DispatchQueue.main.async {
NBMaterialToast.showWithText(self.view, text: "Download Completed", duration: NBLunchDuration.long)
}
} catch let error {
print("fileDownload: error \(error.localizedDescription)")
}
// dismissHUD(isAnimated: false); //dismiss progress
}
func myViewDocumentsmethod(PdfUrl:URL){
print("fileDownload: myViewDocumentsmethod \(PdfUrl)")
DispatchQueue.main.async {
let controladorDoc = UIDocumentInteractionController(url: PdfUrl)
controladorDoc.delegate = self
controladorDoc.presentPreview(animated: true)
}
}
As suggested on this thread:
Download embedded PDF loaded in WKWebView
But Xcode gives me the following error:
"Type of expression is ambiguous without more context"
for the following line inside the downloadPDF function:
let urlSession = URLSession(configuration: .default, delegate: self, delegateQueue: OperationQueue())
as you can see in the attached screenshot.
Any ideas on how to solve that?
Inherit URLSessionDelegate protocol to your class.
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
}
}
}
}
}
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.
This question already has an answer here:
URLSessionDelegate Function Not Being Called
(1 answer)
Closed 4 years ago.
I download the song and then play it on the button. Everything in this part working. But I want to monitor the download indicator and pause and resume downloading. But delegate methods not called.
class ViewController: UIViewController, URLSessionDownloadDelegate, URLSessionTaskDelegate,URLSessionDelegate {
#IBOutlet weak var progressBar: UIProgressView!
let url = URL(string: "https://www.dropbox.com/s/s7zkka3at171wf8/Track01.mp3?raw=1")!
var audioPlayer : AVAudioPlayer!
var task: URLSessionDownloadTask!
let configuration1 = URLSessionConfiguration.default
var urlSession: URLSession!
let operationQueue1 = OperationQueue()
var url1 : URL!
// MARK: - Life CYcle
override func viewDidLoad() {
super.viewDidLoad()
}
// MARK: - IBActions
#IBAction func playAudio(_ sender: Any) {
do {
audioPlayer = try AVAudioPlayer(contentsOf: self.url1)
audioPlayer.play()
}
catch {
print("error")
}
}
#IBAction func pauseAudio(_ sender: Any) {}
#IBAction func downloadButton(_ sender: Any) {
guard let audioUrl = URL(string: "https://www.dropbox.com/s/s7zkka3at171wf8/Track01.mp3?raw=1") else {
return
}
// then lets create your document folder url
let documentsDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
// lets create your destination file url
let destinationUrl = documentsDirectoryURL.appendingPathComponent(audioUrl.lastPathComponent)
print(destinationUrl)
// to check if it exists before downloading it
if FileManager.default.fileExists(atPath: destinationUrl.path) {
print("The file already exists at path")
self.url1 = destinationUrl
// if the file doesn't exist
}
else {
print("0")
urlSession = URLSession(configuration: configuration1, delegate: self, delegateQueue: operationQueue1)
task = urlSession.downloadTask(with: audioUrl) { (location, response, error) in
guard
let location = location else {
return
}
do {
try FileManager.default.moveItem(at: location ,to : destinationUrl)
print("File moved to documents folder")
self.url1 = destinationUrl
}
catch let error as NSError{
print(error.localizedDescription)
}
print("1")
}
task.resume()
print("2")
}
print("3")
}
// MARK: -
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
print("fineshed download file")
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
print(totalBytesWritten)
print(totalBytesExpectedToWrite)
}
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
print("All success")
}
}
Try this
let configuration = URLSessionConfiguration.default
let session = URLSession(configuration: configuration, delegate: self, delegateQueue: OperationQueue.main)
I'm trying to cancel NSOperationQueue process using method cancelAllOperations() using swift but it does not work.
I am downloading a file from url when i cancel the download it doesn't work.
here is the code i am using:
var s = NSOperationQueue.mainQueue()
lazy var session : NSURLSession = {
let config = NSURLSessionConfiguration.ephemeralSessionConfiguration()
config.allowsCellularAccess = false
let session = NSURLSession(configuration: config, delegate: self, delegateQueue: self.s)
return session
}
override func viewDidLoad() {
progressBar.setProgress(0.0, animated: true) //set progressBar to 0 at start
}
#IBAction func cancel(sender: AnyObject) {
s.cancelAllOperations()
}
func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten writ: Int64, totalBytesExpectedToWrite exp: Int64) {
print("downloaded \(100*writ/exp)")
dispatch_async(dispatch_get_main_queue(), {
self.counter = Float(100*writ/exp)
return
})
}
func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didResumeAtOffset fileOffset: Int64, expectedTotalBytes: Int64) {
// unused in this example
}
func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?) {
print("completed: error: \(error)")
if(error != nil){
}
}
// this is the only required NSURLSessionDownloadDelegate method
func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didFinishDownloadingToURL location: NSURL) {
let path = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
let documentDirectoryPath:String = path[0]
let fileManager = NSFileManager()
let destinationURLForFile = NSURL(fileURLWithPath: documentDirectoryPath.stringByAppendingString("Music.mp3"))
if fileManager.fileExistsAtPath(destinationURLForFile.path!){
print("File Already Exists")
}
else{
do {
try fileManager.moveItemAtURL(location, toURL: destinationURLForFile)
print("File doesn't exists")
}catch{
print("An error occurred while moving file to destination url")
}
}
}
I am developing an app where i am downloading data from web.
here i am using cancel button to cancel the download progress,this works fine if i am in the same view controller and if i navigate to new view controller and return back to download view controller progress view is not updating but the download is happening.
This is the code i am using to download data
func URLSession(session: NSURLSession,
downloadTask: NSURLSessionDownloadTask,
didFinishDownloadingToURL location: NSURL){
let path = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
let documentDirectoryPath:String = path[0]
let fileManager = NSFileManager()
let destinationURLForFile = NSURL(fileURLWithPath: documentDirectoryPath.stringByAppendingString( Variables.name ))
if fileManager.fileExistsAtPath(destinationURLForFile.path!){
print("File Already Exists")
} else {
do {
try fileManager.moveItemAtURL(location, toURL: destinationURLForFile)
print("File doesn't exists")
}catch{
print("An error occurred while moving file to destination url")
}
}
}
// 2
func URLSession(session: NSURLSession,
downloadTask: NSURLSessionDownloadTask,
didWriteData bytesWritten: Int64,
totalBytesWritten writ: Int64,
totalBytesExpectedToWrite exp: Int64){
//progressView.setProgress(Float(totalBytesWritten)/Float(totalBytesExpectedToWrite), animated: true)
print("downloaded \(100*writ/exp)")
dispatch_async(dispatch_get_main_queue(), {
self.counter = Float(100*writ/exp)
return
})
}
func URLSession(session: NSURLSession,
task: NSURLSessionTask,
didCompleteWithError error: NSError?){
downloadTask = nil
// progressView.setProgress(0.0, animated: true)
if (error != nil) {
print(error?.description)
} else {
print("The task finished transferring data successfully")
}
}
func documentInteractionControllerViewControllerForPreview(controller: UIDocumentInteractionController) -> UIViewController{
return self
}