How to download PDF using URL in iOS app multiple times - ios

Question

I am getting getting multiple PDF urls from server response and showing them in tableview with download option for each cell.
I am able to download each pdf file only once, But, Tried to second time download, It is showing already downloaded error.
How to fix this?
Here is my code
func downloadButtonTapped(index: Int) {
let finalUrlStr = "(dataResponse?[index].brochure)")
let fileURL = URL(string: finalUrlStr)
let fileName = String((fileURL!.lastPathComponent)) as NSString
// Create destination URL
let documentsUrl:URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let destinationFileUrl = documentsUrl.appendingPathComponent("\(fileName)")
//Create URL to the source file you want to download
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig)
let request = URLRequest(url:fileURL!)
LoadingView.show()
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)
do {
//Show UIActivityViewController to save the downloaded file
let contents = try FileManager.default.contentsOfDirectory(at: documentsUrl, includingPropertiesForKeys: nil, options: .skipsHiddenFiles)
for indexx in 0..<contents.count {
if contents[indexx].lastPathComponent == destinationFileUrl.lastPathComponent {
let activityViewController = UIActivityViewController(activityItems: [contents[indexx]], applicationActivities: nil)
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1) {
self.present(activityViewController, animated: true, completion: nil)
LoadingView.hide()
}
}
}
}
catch (let err) {
// DispatchQueue.main.async {
print("error: \(err.localizedDescription)")
LoadingView.hide()
self.showBasicAlert(title: "\(err.localizedDescription)", message: "")
// }
}
} catch (let writeError) {
print("Error creating a file \(destinationFileUrl) : \(writeError)")
LoadingView.hide()
self.showBasicAlert(title: "\(writeError.localizedDescription)", message: "")
}
} else {
print("Error took place while downloading a file. Error description: \(error?.localizedDescription ?? "")")
self.showBasicAlert(title: "\(error?.localizedDescription ?? "")", message: "")
}
}
task.resume()
}
Even though, PDF not downloaded even one time before download file, activitycontroller displaying and If we close that without download/save file, Again trying to download, Same error message showing like already exist file
How to download multiple times like whenever user taps on download option, It should download the pdf file.
Also after downloaded pdf, I need to show open pdf from external not inside app
Any suggestions?

Answer 1

I have fixed it by myself by removing condition.
Now I am able to download whenever user tap on download button.
Here is the code.
func downloadButtonTapped(index: Int) {
// print("index \(index)")
let finalUrlStr = "(dataResponse?[index].brochure)")
let fileURL = URL(string: finalUrlStr)
if let fileUrl = fileURL {
let fileName = String((fileUrl.lastPathComponent)) as NSString
// Create destination URL
let documentsUrl:URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let destinationFileUrl = documentsUrl.appendingPathComponent("\(fileName)")
//Create URL to the source file you want to download
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig)
let request = URLRequest(url:fileUrl)
LoadingView.show()
let task = session.downloadTask(with: request) { (tempLocalUrl, response, error) in
if error == nil {
// Success
if let statusCode = (response as? HTTPURLResponse)?.statusCode {
print("Successfully downloaded. Status code: \(statusCode)")
}
do {
//Show UIActivityViewController to save the downloaded file
let contents = try FileManager.default.contentsOfDirectory(at: documentsUrl, includingPropertiesForKeys: nil, options: .skipsHiddenFiles)
for indexx in 0..<contents.count {
if contents[indexx].lastPathComponent == destinationFileUrl.lastPathComponent {
let activityViewController = UIActivityViewController(activityItems: [contents[indexx]], applicationActivities: nil)
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1) {
self.present(activityViewController, animated: true, completion: nil)
LoadingView.hide()
}
}
}
}
catch (let err) {
print("error: \(err.localizedDescription)")
DispatchQueue.main.async {
LoadingView.hide()
self.showBasicAlert(title: "\(err.localizedDescription)", message: "")
}
}
}
}
task.resume()
}
}