Determine When Share Sheet Has Been Dismissed After User Saves Document - swift

Question

I am presenting a share sheet to users, this obviously allows them to do a number of things but in my case, they are saving a gpx file to a location of their choice.
I would like to show a UIView when the document has been saved successfully, so my approach was to show the UIView once the share sheet is dismissed by the OS. However, the issue I am having is that if the user manually dismisses the share sheet options without saving the file the delegate method gets called and I only want the delegate method to be called if the user chooses an option from the share sheet.
My code:
func shareAction() {
if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {
let fileURL = dir.appendingPathComponent("\(gpxNameTextField.text!).gpx")
URLSession.shared.dataTask(with: fileURL) { data, response, error in
guard let data = data, error == nil else { return }
let tmpURL = FileManager.default.temporaryDirectory
.appendingPathComponent(response?.suggestedFilename ?? "\(self.gpxNameTextField.text!)")
do {
try data.write(to: tmpURL)
DispatchQueue.main.async {
self.share(url: tmpURL)
self.deleteDraftGPXFile()
}
}
catch {
self.presentAlertView(title: "Error Saving File", message: "There was an error saving the GPX file to disk./nError: \(error.localizedDescription)")
print(error)
}
}.resume()
}
}
func share(url: URL) {
documentInteractionController.url = url
documentInteractionController.uti = url.typeIdentifier ?? "public.data, public.content"
documentInteractionController.name = url.localizedName ?? url.lastPathComponent
documentInteractionController.presentOptionsMenu(from: view.frame, in: view, animated: true)
documentInteractionController.delegate = self
}

Answer 1

func shareAction(_ callback: #escaping (Bool) -> () ) {
if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {
let fileURL = dir.appendingPathComponent("\(gpxNameTextField.text!).gpx")
URLSession.shared.dataTask(with: fileURL) { data, response, error in
guard let data = data, error == nil else { return }
let tmpURL = FileManager.default.temporaryDirectory
.appendingPathComponent(response?.suggestedFilename ?? "\(self.gpxNameTextField.text!)")
do {
try data.write(to: tmpURL)
DispatchQueue.main.async {
self.share(url: tmpURL)
self.deleteDraftGPXFile()
callback(true)
}
}
catch {
self.presentAlertView(title: "Error Saving File", message: "There was an error saving the GPX file to disk./nError: \(error.localizedDescription)")
print(error)
callback(false)
}
}.resume()
}
}
And use this method
sharedAction() { res in
if res {
// File was saved
}