Write any document file to file manager in iOS 11 [duplicate] - ios

Question

I have an XML file in my Xcode Project, and I'm trying to first save it to disk, and secondly how can I tell if I've successfully saved it? Is this the proper approach? Using the simulator I navigated to the new "Files" folder in iOS 11 and I don't see it but I'm not sure if it should be there or not?
guard let path = Bundle.main.url(forResource: "sample", withExtension: "xml") else {print("NO URL"); return}
let sample = try? Data(contentsOf: path)
print("sample XML = \(String(describing: sample?.debugDescription))")
//put xml file on the device
let filename = getDocumentsDirectory().appendingPathComponent("sample.xml")
do {
try sample?.write(to: filename)
} catch {
print("ERROR")
}
updated to include my check if file exists:
//check if file exists
let checkPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
let url = URL(fileURLWithPath: checkPath)
let filePath = url.appendingPathComponent("sample.xml").path
let fileManager = FileManager.default
if fileManager.fileExists(atPath: filePath) {
print("FILE AVAILABLE")
} else {
print("FILE NOT AVAILABLE")
}

Answer 1

You can use UIDocumentInteractionController and let the user select where he wants to save your file when you share your url. The user just needs to select save to files and choose which directory to save the file you are exporting.
You can use UIDocumentInteractionController to share any file type located inside your App bundle, at your Documents directory or another folder accessible from your App.
class ViewController: UIViewController {
let documentInteractionController = UIDocumentInteractionController()
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)
}
#IBAction func shareAction(_ sender: UIButton) {
guard let url = URL(string: "https://www.ibm.com/support/knowledgecenter/SVU13_7.2.1/com.ibm.ismsaas.doc/reference/AssetsImportCompleteSample.csv?view=kc") else { return }
URLSession.shared.dataTask(with: url) { data, response, error in
guard let data = data, error == nil else { return }
let tmpURL = FileManager.default.temporaryDirectory
.appendingPathComponent(response?.suggestedFilename ?? "fileName.csv")
do {
try data.write(to: tmpURL)
DispatchQueue.main.async {
self.share(url: tmpURL)
}
} catch {
print(error)
}
}.resume()
}
}
extension URL {
var typeIdentifier: String? {
return (try? resourceValues(forKeys: [.typeIdentifierKey]))?.typeIdentifier
}
var localizedName: String? {
return (try? resourceValues(forKeys: [.localizedNameKey]))?.localizedName
}
}
edit/update:
If you would like to expose the files located on your App Bundle's document directory you can check this post How can I display my App documents in the Files app for iPhone

Answer 2

Add these two keys to 'info.plist' -
...
<key>UIFileSharingEnabled</key>
<true/>
<key>LSSupportsOpeningDocumentsInPlace</key>
<true/>
...
After this, files saved in '.documentDirectory' will appear in 'Files App' inside a folder with your app name.
If editing 'info.plist' in Xcode then add below keys -
Application supports iTunes file sharing = YES
Supports opening documents in place = YES
info.plist