Swift 3: Reading content of folder? [duplicate] - swift

Question

What is wrong with my code for getting the filenames in the document folder?
func listFilesFromDocumentsFolder() -> [NSString]?{
var theError = NSErrorPointer()
let dirs = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true) as? [String]
if dirs != nil {
let dir = dirs![0] as NSString
let fileList = NSFileManager.defaultManager().contentsOfDirectoryAtPath(dir, error: theError) as [NSString]
return fileList
}else{
return nil
}
}
I thought I read the documents correctly and I am very sure about what is in the documents folder, but "fileList" does not show anything? "dir" shows the path to the folder.

Answer 1

Swift 5
do {
// Get the document directory url
let documentDirectory = try FileManager.default.url(
for: .documentDirectory,
in: .userDomainMask,
appropriateFor: nil,
create: true
)
print("documentDirectory", documentDirectory.path)
// Get the directory contents urls (including subfolders urls)
let directoryContents = try FileManager.default.contentsOfDirectory(
at: documentDirectory,
includingPropertiesForKeys: nil
)
print("directoryContents:", directoryContents.map { $0.localizedName ?? $0.lastPathComponent })
for url in directoryContents {
print(url.localizedName ?? url.lastPathComponent)
}
// if you would like to hide the file extension
for var url in directoryContents {
url.hasHiddenExtension = true
}
for url in directoryContents {
print(url.localizedName ?? url.lastPathComponent)
}
// if you want to get all mp3 files located at the documents directory:
let mp3s = directoryContents.filter(\.isMP3).map { $0.localizedName ?? $0.lastPathComponent }
print("mp3s:", mp3s)
} catch {
print(error)
}
You would need to add those extensions to your project
extension URL {
var typeIdentifier: String? { (try? resourceValues(forKeys: [.typeIdentifierKey]))?.typeIdentifier }
var isMP3: Bool { typeIdentifier == "public.mp3" }
var localizedName: String? { (try? resourceValues(forKeys: [.localizedNameKey]))?.localizedName }
var hasHiddenExtension: Bool {
get { (try? resourceValues(forKeys: [.hasHiddenExtensionKey]))?.hasHiddenExtension == true }
set {
var resourceValues = URLResourceValues()
resourceValues.hasHiddenExtension = newValue
try? setResourceValues(resourceValues)
}
}
}

Answer 2

This solution works with Swift 4 (Xcode 9.2) and also with Swift 5 (Xcode 10.2.1+):
let fileManager = FileManager.default
let documentsURL = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]
do {
let fileURLs = try fileManager.contentsOfDirectory(at: documentsURL, includingPropertiesForKeys: nil)
// process files
} catch {
print("Error while enumerating files \(documentsURL.path): \(error.localizedDescription)")
}
Here's a reusable FileManager extension that also lets you skip or include hidden files in the results:
import Foundation
extension FileManager {
func urls(for directory: FileManager.SearchPathDirectory, skipsHiddenFiles: Bool = true ) -> [URL]? {
let documentsURL = urls(for: directory, in: .userDomainMask)[0]
let fileURLs = try? contentsOfDirectory(at: documentsURL, includingPropertiesForKeys: nil, options: skipsHiddenFiles ? .skipsHiddenFiles : [] )
return fileURLs
}
}
// Usage
print(FileManager.default.urls(for: .documentDirectory) ?? "none")

Answer 3

A shorter syntax for SWIFT 3
func listFilesFromDocumentsFolder() -> [String]?
{
let fileMngr = FileManager.default;
// Full path to documents directory
let docs = fileMngr.urls(for: .documentDirectory, in: .userDomainMask)[0].path
// List all contents of directory and return as [String] OR nil if failed
return try? fileMngr.contentsOfDirectory(atPath:docs)
}
Usage example:
override func viewDidLoad()
{
print(listFilesFromDocumentsFolder())
}
Tested on xCode 8.2.3 for iPhone 7 with iOS 10.2 & iPad with iOS 9.3

Answer 4

Apple states about NSSearchPathForDirectoriesInDomains(_:_:_:):
You should consider using the FileManager methods urls(for:in:) and url(for:in:appropriateFor:create:) which return URLs, which are the preferred format.
With Swift 5, FileManager has a method called contentsOfDirectory(at:includingPropertiesForKeys:options:). contentsOfDirectory(at:includingPropertiesForKeys:options:) has the following declaration:
Performs a shallow search of the specified directory and returns URLs for the contained items.
func contentsOfDirectory(at url: URL, includingPropertiesForKeys keys: [URLResourceKey]?, options mask: FileManager.DirectoryEnumerationOptions = []) throws -> [URL]
Therefore, in order to retrieve the urls of the files contained in documents directory, you can use the following code snippet that uses FileManager's urls(for:in:) and contentsOfDirectory(at:includingPropertiesForKeys:options:) methods:
guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
do {
let directoryContents = try FileManager.default.contentsOfDirectory(at: documentsDirectory, includingPropertiesForKeys: nil, options: [])
// Print the urls of the files contained in the documents directory
print(directoryContents)
} catch {
print("Could not search for urls of files in documents directory: \(error)")
}
As an example, the UIViewController implementation below shows how to save a file from app bundle to documents directory and how to get the urls of the files saved in documents directory:
import UIKit
class ViewController: UIViewController {
#IBAction func copyFile(_ sender: UIButton) {
// Get file url
guard let fileUrl = Bundle.main.url(forResource: "Movie", withExtension: "mov") else { return }
// Create a destination url in document directory for file
guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
let documentDirectoryFileUrl = documentsDirectory.appendingPathComponent("Movie.mov")
// Copy file to document directory
if !FileManager.default.fileExists(atPath: documentDirectoryFileUrl.path) {
do {
try FileManager.default.copyItem(at: fileUrl, to: documentDirectoryFileUrl)
print("Copy item succeeded")
} catch {
print("Could not copy file: \(error)")
}
}
}
#IBAction func displayUrls(_ sender: UIButton) {
guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
do {
let directoryContents = try FileManager.default.contentsOfDirectory(at: documentsDirectory, includingPropertiesForKeys: nil, options: [])
// Print the urls of the files contained in the documents directory
print(directoryContents) // may print [] or [file:///private/var/mobile/Containers/Data/Application/.../Documents/Movie.mov]
} catch {
print("Could not search for urls of files in documents directory: \(error)")
}
}
}

Answer 5

Simple and dynamic solution (Swift 5):
extension FileManager {
class func directoryUrl() -> URL? {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
return paths.first
}
class func allRecordedData() -> [URL]? {
if let documentsUrl = FileManager.directoryUrl() {
do {
let directoryContents = try FileManager.default.contentsOfDirectory(at: documentsUrl, includingPropertiesForKeys: nil)
return directoryContents.filter{ $0.pathExtension == "m4a" }
} catch {
return nil
}
}
return nil
}}

Answer 6

This code prints out all the directories and files in my documents directory:
Some modification of your function:
func listFilesFromDocumentsFolder() -> [String]
{
let dirs = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.allDomainsMask, true)
if dirs != [] {
let dir = dirs[0]
let fileList = try! FileManager.default.contentsOfDirectory(atPath: dir)
return fileList
}else{
let fileList = [""]
return fileList
}
}
Which gets called by:
let fileManager:FileManager = FileManager.default
let fileList = listFilesFromDocumentsFolder()
let count = fileList.count
for i in 0..<count
{
if fileManager.fileExists(atPath: fileList[i]) != true
{
print("File is \(fileList[i])")
}
}

Answer 7

Swift 2.0 Compability
func listWithFilter () {
let fileManager = NSFileManager.defaultManager()
// We need just to get the documents folder url
let documentsUrl = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0] as NSURL
do {
// if you want to filter the directory contents you can do like this:
if let directoryUrls = try? NSFileManager.defaultManager().contentsOfDirectoryAtURL(documentsUrl, includingPropertiesForKeys: nil, options: NSDirectoryEnumerationOptions.SkipsSubdirectoryDescendants) {
print(directoryUrls)
........
}
}
}
OR
func listFiles() -> [String] {
var theError = NSErrorPointer()
let dirs = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true) as? [String]
if dirs != nil {
let dir = dirs![0]
do {
let fileList = try NSFileManager.defaultManager().contentsOfDirectoryAtPath(dir)
return fileList as [String]
}catch {
}
}else{
let fileList = [""]
return fileList
}
let fileList = [""]
return fileList
}