Related
a. How should I get all the txt files in directory?
i got a path of directory and now i should find all the txt files and change every one a little.
i try to run over all the files:
let fileManager = NSFileManager.defaultManager()
let enumerator:NSDirectoryEnumerator = fileManager.enumeratorAtPath(folderPath)
while let element = enumerator?.nextObject() as? String {
}
}
but I stuck there. How can I check if the filetype is text?
b. When i get to a directory (in the directory I run), I want get in and search there too, and in the end get out to the place I was and continue.
a is much more important to me but if I get an answer to b too it will be nice.
a. Easy and simple solution for Swift 3:
let enumerator = FileManager.default.enumerator(atPath: folderPath)
let filePaths = enumerator?.allObjects as! [String]
let txtFilePaths = filePaths.filter{$0.contains(".txt")}
for txtFilePath in txtFilePaths{
//Here you get each text file path present in folder
//Perform any operation you want by using its path
}
Your task a is completed by above code.
When talking about b, well you don't have to code for it because we are here using a enumerator which gives you the files which are inside of any directory from your given root directory.
So the enumerator does the work for you of getting inside a directory and getting you their paths.
You can use for .. in syntax of swift to enumerate through NSEnumerator.
Here is a simple function I wrote to extract all file of some extension inside a folder.
func extractAllFile(atPath path: String, withExtension fileExtension:String) -> [String] {
let pathURL = NSURL(fileURLWithPath: path, isDirectory: true)
var allFiles: [String] = []
let fileManager = NSFileManager.defaultManager()
if let enumerator = fileManager.enumeratorAtPath(path) {
for file in enumerator {
if let path = NSURL(fileURLWithPath: file as! String, relativeToURL: pathURL).path
where path.hasSuffix(".\(fileExtension)"){
allFiles.append(path)
}
}
}
return allFiles
}
let folderPath = NSBundle.mainBundle().pathForResource("Files", ofType: nil)
let allTextFiles = extractAllFile(atPath: folder!, withExtension: "txt") // returns file path of all the text files inside the folder
I needed to combine multiple answers in order to fetch the images from a directory and I'm posting my solution in Swift 3
func searchImages(pathURL: URL) -> [String] {
var imageURLs = [String]()
let fileManager = FileManager.default
let keys = [URLResourceKey.isDirectoryKey, URLResourceKey.localizedNameKey]
let options: FileManager.DirectoryEnumerationOptions = [.skipsPackageDescendants, .skipsSubdirectoryDescendants, .skipsHiddenFiles]
let enumerator = fileManager.enumerator(
at: pathURL,
includingPropertiesForKeys: keys,
options: options,
errorHandler: {(url, error) -> Bool in
return true
})
if enumerator != nil {
while let file = enumerator!.nextObject() {
let path = URL(fileURLWithPath: (file as! URL).absoluteString, relativeTo: pathURL).path
if path.hasSuffix(".png"){
imageURLs.append(path)
}
}
}
return imageURLs
}
and here is a sample call
let documentsDirectory = FileManager.default.urls(for:.documentDirectory, in: .userDomainMask)[0]
let destinationPath = documentsDirectory.appendingPathComponent("\(filename)/")
searchImages(pathURL: projectPath)
Swift 4
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let url = URL(fileURLWithPath: documentsPath)
let fileManager = FileManager.default
let enumerator: FileManager.DirectoryEnumerator = fileManager.enumerator(atPath: url.path)!
while let element = enumerator.nextObject() as? String, element.hasSuffix(".txt") {
// do something
}
let fileManager = NSFileManager.defaultManager()
let enumerator:NSDirectoryEnumerator = fileManager.enumeratorAtPath(folderPath)
while let element = enumerator?.nextObject() as? String where element.pathExtension == "txt" {
// element is txt file
}
let fileManager = NSFileManager.defaultManager()
let enumerator:NSDirectoryEnumerator = fileManager.enumeratorAtPath(folderPath!)!
while let element = enumerator.nextObject() as? String {
if (element.hasSuffix(".txt")) { // element is a txt file }
}
I'm really confused on this one. There are dozens of questions around the web asking "How do I get info from my plist file in Swift?" and the same answer is posted everywhere:
let path = NSBundle.mainBundle().pathForResource("Config", ofType: "plist")
However, this line produces always produces nil for me. I have replaced Config with other components found in the default plist file, but get nil as well.
I am trying to access my custom ProductIdentifiers Array like so:
let url = NSBundle.mainBundle().URLForResource("ProductIdentifiers", withExtension: "plist")!
var productArray = NSArray(contentsOfURL: url) as! [[String:AnyObject!]]
I get a crash stating fatal error: unexpectedly found nil while unwrapping an Optional value on productArray. I have also tried this with other default plist values in place of ProductIdentifiers.
Does anyone know why this is not working for me even though there are so many posts around of people using this successfully?
I've never heard of the OP's approach working before. Instead, you should open the Info.plist file itself, then extract values from it, like so:
Swift 3.0+
func getInfoDictionary() -> [String: AnyObject]? {
guard let infoDictPath = Bundle.main.path(forResource: "Info", ofType: "plist") else { return nil }
return NSDictionary(contentsOfFile: infoDictPath) as? [String : AnyObject]
}
let productIdentifiers = getInfoDictionary()?["ProductIdentifiers"]
Swift 2.0
func getInfoDictionary() -> NSDictionary? {
guard let infoDictPath = NSBundle.mainBundle().pathForResource("Info", ofType: "plist") else { return nil }
return NSDictionary(contentsOfFile: infoDictPath)
}
let productIdentifiers = getInfoDictionary()?["ProductIdentifiers"]
Resource represents the file name of the plist rather than its contents.
The root object of the plist is probably a dictionary.
Replace MyPlist with the real file name.
This code prints the contents of the plist
if let url = NSBundle.mainBundle().URLForResource("MyPlist", withExtension: "plist"),
root = NSDictionary(contentsOfURL: url) as? [String:AnyObject]
{
print(root)
} else {
print("Either the file does not exist or the root object is an array")
}
All of my attempts to read from a plist have resulted in a nil value returned, I've tried this in several ways on both Xcode 6 & Xcode beta 7. Also, there are quite a few similar questions on stack, I've tried many of them, but none of them resolve this issue.
I've added my words.plist by clicking on:
{my project} > targets > build phases > copy Bundle Resources
Then I tried several variations of the following code in my ViewController:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
let documentsDirectory = paths[0] as! String
let path = documentsDirectory.stringByAppendingPathComponent("words.plist")
let fileManager = NSFileManager.defaultManager()
//check if file exists
if(!fileManager.fileExistsAtPath(path)) {
// If it doesn't, copy it from the default file in the Bundle
if let bundlePath = NSBundle.mainBundle().pathForResource("words", ofType: "plist") {
let resultDictionary = NSMutableDictionary(contentsOfFile: bundlePath)
println("Bundle words file is --> \(resultDictionary?.description)") // this is nil!!!
fileManager.copyItemAtPath(bundlePath, toPath: path, error: nil)
} else {
println("words not found. Please, make sure it is part of the bundle.")
}
} else {
println("words already exits at path.")
// use this to delete file from documents directory
//fileManager.removeItemAtPath(path, error: nil)
}
print("entering if-let")
if let pfr = NSBundle.mainBundle().pathForResource("words", ofType: "plist") {
print("\nin let\n")
print(pfr)
print("\nentering dict if-let\n")
if let dict = NSDictionary(contentsOfFile: path) as? Dictionary<String, AnyObject> {
// use swift dictionary as normal
print("\nin let\n")
print(dict)
}
}
}
Question
Why am I getting a nil value and whats the proper way to add a plist file and read from it?
update:
inside my if statement the following is nil:
let resultDictionary = NSMutableDictionary(contentsOfFile: bundlePath)
println("Bundle words file is --> \(resultDictionary?.description)") // this is nil!!!
To me, this would indicate that either Xcode doesn't know about my words.plist file, or that I'm pointing my bundlePath to the wrong location.
the issue:
As #Steven Fisher stated, in the comments. My .plist file was an Array and not an NSDictionary. So I just had to switch two lines from my code:
let resultDictionary = NSMutableDictionary(contentsOfFile: bundlePath)
to
let resultDictionary = NSMutableArray(contentsOfFile: bundlePath)
and also
if let dict = NSDictionary(contentsOfFile: path) { //...
to
if let dict = NSArray(contentsOfFile: path) { //..
final working code:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
let documentsDirectory = paths[0] as! String
let path = documentsDirectory.stringByAppendingPathComponent("words.plist")
let fileManager = NSFileManager.defaultManager()
//check if file exists
if(!fileManager.fileExistsAtPath(path)) {
// If it doesn't, copy it from the default file in the Bundle
if let bundlePath = NSBundle.mainBundle().pathForResource("words", ofType: "plist") {
let resultDictionary = NSMutableArray(contentsOfFile: bundlePath)
println("Bundle words file is --> \(resultDictionary?.description)")
fileManager.copyItemAtPath(bundlePath, toPath: path, error: nil)
} else {
println("words not found. Please, make sure it is part of the bundle.")
}
} else {
println("words already exits at path.")
// use this to delete file from documents directory
//fileManager.removeItemAtPath(path, error: nil)
}
print("entering if-let")
if let pfr = NSBundle.mainBundle().pathForResource("words", ofType: "plist") {
print("\nin let\n")
print(pfr)
print("\nentering dict if-let\n")
if let dict = NSArray(contentsOfFile: pfr) {
// use swift dictionary as normal
print("\nin let\n")
print(dict)
}
}
}
I'm quite new to programming a Swift and I'm trying to iterate through the files in a folder.
I took a look at the answer here and tried to translate it to Swift syntax, but didn't succeed.
let fileManager = NSFileManager.defaultManager()
let enumerator:NSDirectoryEnumerator = fileManager.enumeratorAtPath(folderPath)
for element in enumerator {
//do something
}
the error I get is:
Type 'NSDirectoryEnumerator' does not conform to protocol 'SequenceType'
My aim is to look at all the subfolders and files contained into the main folder and find all the files with a certain extension to then do something with them.
Use the nextObject() method of enumerator:
while let element = enumerator?.nextObject() as? String {
if element.hasSuffix("ext") { // checks the extension
}
}
Nowadays (early 2017) it's highly recommended to use the – more versatile – URL related API
let fileManager = FileManager.default
do {
let resourceKeys : [URLResourceKey] = [.creationDateKey, .isDirectoryKey]
let documentsURL = try fileManager.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
let enumerator = FileManager.default.enumerator(at: documentsURL,
includingPropertiesForKeys: resourceKeys,
options: [.skipsHiddenFiles], errorHandler: { (url, error) -> Bool in
print("directoryEnumerator error at \(url): ", error)
return true
})!
for case let fileURL as URL in enumerator {
let resourceValues = try fileURL.resourceValues(forKeys: Set(resourceKeys))
print(fileURL.path, resourceValues.creationDate!, resourceValues.isDirectory!)
}
} catch {
print(error)
}
I couldn't get pNre's solution to work at all; the while loop just never received anything. However, I did come across this solution which works for me (in Xcode 6 beta 6, so perhaps things have changed since pNre posted the above answer?):
for url in enumerator!.allObjects {
print("\((url as! NSURL).path!)")
}
my two cents from previously anwers.. more swifty and with optionals:
let enumerator = FileManager.default.enumerator(atPath: folderPath)
while let element = enumerator?.nextObject() as? String {
print(element)
if let fType = enumerator?.fileAttributes?[FileAttributeKey.type] as? FileAttributeType{
switch fType{
case .typeRegular:
print("a file")
case .typeDirectory:
print("a dir")
}
}
}
returns all files in a directory + in subdirectories
import Foundation
let path = "<some path>"
let enumerator = FileManager.default.enumerator(atPath: path)
while let filename = enumerator?.nextObject() as? String {
print(filename)
}
Swift3 + absolute urls
extension FileManager {
func listFiles(path: String) -> [URL] {
let baseurl: URL = URL(fileURLWithPath: path)
var urls = [URL]()
enumerator(atPath: path)?.forEach({ (e) in
guard let s = e as? String else { return }
let relativeURL = URL(fileURLWithPath: s, relativeTo: baseurl)
let url = relativeURL.absoluteURL
urls.append(url)
})
return urls
}
}
Based on code from #user3441734
Swift 3
let fd = FileManager.default
fd.enumerator(atPath: "/Library/FileSystems")?.forEach({ (e) in
if let e = e as? String, let url = URL(string: e) {
print(url.pathExtension)
}
})
In case that you are getting the
'NSDirectoryEnumerator?' does not have a member named 'nextObject' error
the while loop should be:
while let element = enumerator?.nextObject() as? String {
// do things with element
}
It has something to do with optional chaining
SWIFT 3.0
Returns all files with extension in the Directory passed & its subdirectories
func extractAllFile(atPath path: String, withExtension fileExtension:String) -> [String] {
let pathURL = NSURL(fileURLWithPath: path, isDirectory: true)
var allFiles: [String] = []
let fileManager = FileManager.default
let pathString = path.replacingOccurrences(of: "file:", with: "")
if let enumerator = fileManager.enumerator(atPath: pathString) {
for file in enumerator {
if #available(iOS 9.0, *) {
if let path = NSURL(fileURLWithPath: file as! String, relativeTo: pathURL as URL).path, path.hasSuffix(".\(fileExtension)"){
let fileNameArray = (path as NSString).lastPathComponent.components(separatedBy: ".")
allFiles.append(fileNameArray.first!)
}
} else {
// Fallback on earlier versions
print("Not available, #available iOS 9.0 & above")
}
}
}
return allFiles
}
Updating for Swift 3:
let fileManager = FileManager() // let fileManager = NSFileManager.defaultManager()
let en=fileManager.enumerator(atPath: the_path) // let enumerator:NSDirectoryEnumerator = fileManager.enumeratorAtPath(folderPath)
while let element = en?.nextObject() as? String {
if element.hasSuffix("ext") {
// do something with the_path/*.ext ....
}
}
Adding to vadian's response -- the Apple docs mention that Path-based URLs are simpler in some ways, however file reference URLs have the advantage that the reference remains valid if the file is moved or renamed while your app is running.
From the documentation for "Accessing Files and Directories":
"Path-based URLs are easier to manipulate, easier to debug, and are generally preferred by classes such as NSFileManager. An advantage of file reference URLs is that they are less fragile than path-based URLs while your app is running. If the user moves a file in the Finder, any path-based URLs that refer to the file immediately become invalid and must be updated to the new path. However, as long as the file moved to another location on the same disk, its unique ID does not change and any file reference URLs remain valid."
https://developer.apple.com/library/content/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/AccessingFilesandDirectories/AccessingFilesandDirectories.html
If you want to categorically check whether an element is a file or a subdirectory:
let enumerator = FileManager.default.enumerator(atPath: contentsPath);
while let element = enumerator?.nextObject() as? String {
if(enumerator?.fileAttributes?[FileAttributeKey.type] as! FileAttributeType == FileAttributeType.typeRegular){
//this is a file
}
else if(enumerator?.fileAttributes?[FileAttributeKey.type] as! FileAttributeType == FileAttributeType.typeDirectory){
//this is a sub-directory
}
}
Recently struggled with this when handling an array of urls, whether they be a directory or not (eg. drag and drop). Ended up with this extension in swift 4, may be of use
extension Sequence where Iterator.Element == URL {
var handleDir: [URL] {
var files: [URL] = []
self.forEach { u in
guard u.hasDirectoryPath else { return files.append(u.resolvingSymlinksInPath()) }
guard let dir = FileManager.default.enumerator(at: u.resolvingSymlinksInPath(), includingPropertiesForKeys: nil) else { return }
for case let url as URL in dir {
files.append(url.resolvingSymlinksInPath())
}
}
return files
}
}
Avoid reference URLs, while they do have some advantages as stated above, they eat system resources and if you’re enumerating a large filesystem (not that large actually) your app will hit a system wall quickly and get shutdown by macOS.
I'm quite new to programming a Swift and I'm trying to iterate through the files in a folder.
I took a look at the answer here and tried to translate it to Swift syntax, but didn't succeed.
let fileManager = NSFileManager.defaultManager()
let enumerator:NSDirectoryEnumerator = fileManager.enumeratorAtPath(folderPath)
for element in enumerator {
//do something
}
the error I get is:
Type 'NSDirectoryEnumerator' does not conform to protocol 'SequenceType'
My aim is to look at all the subfolders and files contained into the main folder and find all the files with a certain extension to then do something with them.
Use the nextObject() method of enumerator:
while let element = enumerator?.nextObject() as? String {
if element.hasSuffix("ext") { // checks the extension
}
}
Nowadays (early 2017) it's highly recommended to use the – more versatile – URL related API
let fileManager = FileManager.default
do {
let resourceKeys : [URLResourceKey] = [.creationDateKey, .isDirectoryKey]
let documentsURL = try fileManager.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
let enumerator = FileManager.default.enumerator(at: documentsURL,
includingPropertiesForKeys: resourceKeys,
options: [.skipsHiddenFiles], errorHandler: { (url, error) -> Bool in
print("directoryEnumerator error at \(url): ", error)
return true
})!
for case let fileURL as URL in enumerator {
let resourceValues = try fileURL.resourceValues(forKeys: Set(resourceKeys))
print(fileURL.path, resourceValues.creationDate!, resourceValues.isDirectory!)
}
} catch {
print(error)
}
I couldn't get pNre's solution to work at all; the while loop just never received anything. However, I did come across this solution which works for me (in Xcode 6 beta 6, so perhaps things have changed since pNre posted the above answer?):
for url in enumerator!.allObjects {
print("\((url as! NSURL).path!)")
}
my two cents from previously anwers.. more swifty and with optionals:
let enumerator = FileManager.default.enumerator(atPath: folderPath)
while let element = enumerator?.nextObject() as? String {
print(element)
if let fType = enumerator?.fileAttributes?[FileAttributeKey.type] as? FileAttributeType{
switch fType{
case .typeRegular:
print("a file")
case .typeDirectory:
print("a dir")
}
}
}
returns all files in a directory + in subdirectories
import Foundation
let path = "<some path>"
let enumerator = FileManager.default.enumerator(atPath: path)
while let filename = enumerator?.nextObject() as? String {
print(filename)
}
Swift3 + absolute urls
extension FileManager {
func listFiles(path: String) -> [URL] {
let baseurl: URL = URL(fileURLWithPath: path)
var urls = [URL]()
enumerator(atPath: path)?.forEach({ (e) in
guard let s = e as? String else { return }
let relativeURL = URL(fileURLWithPath: s, relativeTo: baseurl)
let url = relativeURL.absoluteURL
urls.append(url)
})
return urls
}
}
Based on code from #user3441734
Swift 3
let fd = FileManager.default
fd.enumerator(atPath: "/Library/FileSystems")?.forEach({ (e) in
if let e = e as? String, let url = URL(string: e) {
print(url.pathExtension)
}
})
In case that you are getting the
'NSDirectoryEnumerator?' does not have a member named 'nextObject' error
the while loop should be:
while let element = enumerator?.nextObject() as? String {
// do things with element
}
It has something to do with optional chaining
SWIFT 3.0
Returns all files with extension in the Directory passed & its subdirectories
func extractAllFile(atPath path: String, withExtension fileExtension:String) -> [String] {
let pathURL = NSURL(fileURLWithPath: path, isDirectory: true)
var allFiles: [String] = []
let fileManager = FileManager.default
let pathString = path.replacingOccurrences(of: "file:", with: "")
if let enumerator = fileManager.enumerator(atPath: pathString) {
for file in enumerator {
if #available(iOS 9.0, *) {
if let path = NSURL(fileURLWithPath: file as! String, relativeTo: pathURL as URL).path, path.hasSuffix(".\(fileExtension)"){
let fileNameArray = (path as NSString).lastPathComponent.components(separatedBy: ".")
allFiles.append(fileNameArray.first!)
}
} else {
// Fallback on earlier versions
print("Not available, #available iOS 9.0 & above")
}
}
}
return allFiles
}
Updating for Swift 3:
let fileManager = FileManager() // let fileManager = NSFileManager.defaultManager()
let en=fileManager.enumerator(atPath: the_path) // let enumerator:NSDirectoryEnumerator = fileManager.enumeratorAtPath(folderPath)
while let element = en?.nextObject() as? String {
if element.hasSuffix("ext") {
// do something with the_path/*.ext ....
}
}
Adding to vadian's response -- the Apple docs mention that Path-based URLs are simpler in some ways, however file reference URLs have the advantage that the reference remains valid if the file is moved or renamed while your app is running.
From the documentation for "Accessing Files and Directories":
"Path-based URLs are easier to manipulate, easier to debug, and are generally preferred by classes such as NSFileManager. An advantage of file reference URLs is that they are less fragile than path-based URLs while your app is running. If the user moves a file in the Finder, any path-based URLs that refer to the file immediately become invalid and must be updated to the new path. However, as long as the file moved to another location on the same disk, its unique ID does not change and any file reference URLs remain valid."
https://developer.apple.com/library/content/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/AccessingFilesandDirectories/AccessingFilesandDirectories.html
If you want to categorically check whether an element is a file or a subdirectory:
let enumerator = FileManager.default.enumerator(atPath: contentsPath);
while let element = enumerator?.nextObject() as? String {
if(enumerator?.fileAttributes?[FileAttributeKey.type] as! FileAttributeType == FileAttributeType.typeRegular){
//this is a file
}
else if(enumerator?.fileAttributes?[FileAttributeKey.type] as! FileAttributeType == FileAttributeType.typeDirectory){
//this is a sub-directory
}
}
Recently struggled with this when handling an array of urls, whether they be a directory or not (eg. drag and drop). Ended up with this extension in swift 4, may be of use
extension Sequence where Iterator.Element == URL {
var handleDir: [URL] {
var files: [URL] = []
self.forEach { u in
guard u.hasDirectoryPath else { return files.append(u.resolvingSymlinksInPath()) }
guard let dir = FileManager.default.enumerator(at: u.resolvingSymlinksInPath(), includingPropertiesForKeys: nil) else { return }
for case let url as URL in dir {
files.append(url.resolvingSymlinksInPath())
}
}
return files
}
}
Avoid reference URLs, while they do have some advantages as stated above, they eat system resources and if you’re enumerating a large filesystem (not that large actually) your app will hit a system wall quickly and get shutdown by macOS.