// Get the document directory url
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
do {
// Get the directory contents urls (including subfolders urls)
let directoryContents = try FileManager.default.contentsOfDirectory(at: documentsUrl, includingPropertiesForKeys: nil)
print(directoryContents)
// if you want to filter the directory contents you can do like this:
let mp3Files = directoryContents.filter{ $0.pathExtension == "mp3" }
print("mp3 urls:",mp3Files)
let mp3FileNames = mp3Files.map{ $0.deletingPathExtension().lastPathComponent }
print("mp3 list:", mp3FileNames)
} catch {
print(error)
}