Save file to custom folder - swift

Question

In AppDelegate I create hidden folder in .documents if it doesn't exist:
let fileManager = FileManager.default
let path = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first!
let audioKitFilesFolder = path.appendingPathComponent(".AudioKitFilesFolder")
var isDir : ObjCBool = false
if fileManager.fileExists(atPath: audioKitFilesFolder.absoluteString, isDirectory:&isDir) {
if isDir.boolValue {
print("file exists and is a directory")
} else {
print("file exists and is not a directory")
}
} else {
do {
try fileManager.createDirectory(at: audioKitFilesFolder, withIntermediateDirectories: true, attributes: nil)
} catch {
print("Can't Create Folder \(error)")
}
}
In my Networking API I have func that save file from web to .documents. But I need save this file to the my hidden Folder. How I can get path for this folder for my copyItem method?
Newtwork API func:
func downloadFile(id: Int, url: URL, fileName: String) {
var request = URLRequest(url: url)
URLSession.shared.downloadTask(with: url, completionHandler: { location, response, error in
guard let location = location, error == nil else { return }
do {
let fileManager = FileManager.default
let documentsURL = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]
let fileURL = documentsURL.appendingPathComponent(fileName)
try fileManager.copyItem(at: location, to: fileURL)
try self.router.configureParameters(bodyParameters: ["uuid": UserDefaultsHelper.uuid], urlParameters: nil, request: &request)
} catch {
print(error)
}
}).resume()
URLSession.shared.dataTask(with: request) { data, response, error in
if let response = response {
print(response)
}
if let data = data {
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
print(json)
} catch {
print(error)
}
}
}.resume()
}

Answer 1

What happens if you change
do {
let fileManager = FileManager.default
let documentsURL = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]
let fileURL = documentsURL.appendingPathComponent(fileName)
try fileManager.copyItem(at: location, to: fileURL)
try self.router.configureParameters(bodyParameters: ["uuid": UserDefaultsHelper.uuid], urlParameters: nil, request: &request)
} catch {
to
do {
let fileManager = FileManager.default
let documentsURL = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]
let audioKitFilesFolder = documentsURL.appendingPathComponent(".AudioKitFilesFolder")
let fileURL = audioKitFilesFolder.appendingPathComponent(fileName)
try fileManager.copyItem(at: location, to: fileURL)
try self.router.configureParameters(bodyParameters: ["uuid": UserDefaultsHelper.uuid], urlParameters: nil, request: &request)
} catch {
and perhaps remove the . from . AudioKitFilesFolder in all places