ios 获取文档文件夹中的文件列表

Getting list of files in documents folder

提问by pawi

What is wrong with my code for getting the filenames in the document folder?

我用于获取文档文件夹中文件名的代码有什么问题？

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.

我以为我正确阅读了文档并且我非常确定文档文件夹中的内容，但是“fileList”没有显示任何内容？“dir”显示文件夹的路径。

采纳答案by Karoly Nyisztor

This solution works with Swift 4(Xcode 9.2) and also with Swift 5(Xcode 10.2.1+):

此解决方案适用于Swift 4(Xcode 9.2) 和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:

这是一个可重用的 FileManager 扩展，它还允许您在结果中跳过或包含隐藏文件：

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")

回答by Leo Dabus

Swift 5

斯威夫特 5

// 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{ 
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)
}
.pathExtension == "mp3" }
    print("mp3 urls:",mp3Files)
    let mp3FileNames = mp3Files.map{ 
override func viewDidLoad()
{
    print(listFilesFromDocumentsFolder())
}
.deletingPathExtension().lastPathComponent }
    print("mp3 list:", mp3FileNames)

} catch {
    print(error)
}

回答by Nikita Kurtin

A shorter syntax for SWIFT 3

SWIFT 3 的简短语法

func contentsOfDirectory(at url: URL, includingPropertiesForKeys keys: [URLResourceKey]?, options mask: FileManager.DirectoryEnumerationOptions = []) throws -> [URL]

Usage example:

用法示例：

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)")
}

Tested on xCode 8.2.3 for iPhone 7 with iOS 10.2 & iPad with iOS 9.3

在 iOS 10.2 的 iPhone 7 和 iOS 9.3 的 iPad 的 xCode 8.2.3 上测试

回答by Imanou Petit

Apple states about NSSearchPathForDirectoriesInDomains(_:_:_:):

Apple 声明NSSearchPathForDirectoriesInDomains(_:_:_:)：

You should consider using the FileManagermethods urls(for:in:)and url(for:in:appropriateFor:create:)which return URLs, which are the preferred format.

您应该考虑使用FileManager方法urls(for:in:)和url(for:in:appropriateFor:create:)返回 URL，这是首选格式。

---

---

With Swift 5, FileManagerhas a method called contentsOfDirectory(at:includingPropertiesForKeys:options:). contentsOfDirectory(at:includingPropertiesForKeys:options:)has the following declaration:

在 Swift 5 中，FileManager有一个名为contentsOfDirectory(at:includingPropertiesForKeys:options:). contentsOfDirectory(at:includingPropertiesForKeys:options:)有以下声明：

Performs a shallow search of the specified directory and returns URLs for the contained items.

对指定目录执行浅搜索并返回包含项目的 URL。

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)")
        }
    }

}

---

---

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:

因此，为了检索包含在文档目录中的文件的 url，您可以使用以下使用FileManager'surls(for:in:)和contentsOfDirectory(at:includingPropertiesForKeys:options:)方法的代码片段：

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
    }
}

---

---

As an example, the UIViewControllerimplementation 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:

例如，UIViewController下面的实现显示了如何将文件从应用程序包保存到文档目录以及如何获取保存在文档目录中的文件的 url：

    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])")
        }
    }

回答by jwlaughton

This code prints out all the directories and files in my documents directory:

此代码打印出我的文档目录中的所有目录和文件：

Some modification of your function:

对您的功能进行一些修改：

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)
       ........
        }

    }

}

Which gets called by:

哪个被调用：

 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

}

回答by Gleb

Swift 2.0 Compability

Swift 2.0 兼容性

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{ ##代码##.pathExtension == "m4a" }
        } catch {
            return nil
        }
     }
     return nil
  }}

OR

或者

##代码##

回答by nitin.agam

Simple and dynamic solution (Swift 5):

简单而动态的解决方案（Swift 5）：

##代码##