获取文档文件夹中的文件列表

Question

我的代码在文档文件夹中获取文件名有什么问题？

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
    }
}

我以为我正确阅读了文档,我非常确定文档文件夹中的内容,但"fileList"没有显示任何内容？"dir"显示文件夹的路径.

Answer 1

Xcode 8.1•Swift 3.0.1

// 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)
}

Answer 2

这是一个适用于Swift 4/Xcode 9.2的解决方案:

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)")
}

Answer 3

SWIFT 3的语法较短

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)
}

用法示例:

override func viewDidLoad()
{
    print(listFilesFromDocumentsFolder())
}

测试xCode 8.2.3 for iPhone 7,iOS 10.2和iPad,iOS 9.3

Answer 4

简单而动态的解决方案（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 5

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

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.

使用Swift 3,FileManager有一个叫做的方法contentsOfDirectory(at:includingPropertiesForKeys:options:).contentsOfDirectory(at:includingPropertiesForKeys:options:)有以下声明:

对指定目录执行浅层搜索,并返回包含项的URL.

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

因此,为了检索文档目录中包含的文件的URL,您可以使用以下使用FileManager's urls(for:in:)和contentsOfDirectory(at:includingPropertiesForKeys:options:)方法的代码片段:

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)")
}

作为示例,UIViewController下面的实现显示了如何将文件从app bundle保存到文档目录,以及如何获取保存在documents目录中的文件的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)")
        }
    }

}

Answer 6

此代码打印出我的文档目录中的所有目录和文件：

对功能的一些修改：

func listFilesFromDocumentsFolder() -> [String]
{
    var theError = NSErrorPointer()
    let dirs = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true) as? [String]
    if dirs != nil {
        let dir = dirs![0]
        let fileList = NSFileManager.defaultManager().contentsOfDirectoryAtPath(dir, error: theError)
        return fileList as! [String]   // edit: added ! for Swift 1.2 compatibitily
    }else{
        let fileList = [""]
        return fileList
    }
}

调用者：

    let fileManager:NSFileManager = NSFileManager.defaultManager()
    var fileList = listFilesFromDocumentsFolder()

    let count = fileList.count
    var isDir:Bool = true;

    for var i:Int = 0; i < count; i++
    {
        if fileManager.fileExistsAtPath(fileList[i]) != true
        {
            println("File is \(fileList[i])")
        }
    }