使用 Swift 获取子目录 [英] Get Subdirectories using Swift

问题描述

我正在尝试仅获取子目录.这是我的数据结构.

I'm trying to get ONLY subdirectories. Here's my data structure.

根/

• a/
  • 1.txt
  • 2.txt
  • 3.txt
  • 4.txt

  我想获取特定文件夹(根)中的目录.我在根文件路径中使用枚举器:

  I want to get directories in a specific folder(root). I use enumerator in root file path:

  let enumerator = NSFileManager.defaultManager().enumeratorAtPath(filePath)
  for element in enumerator! {
     print(element)
  }
  

  但是，它会迭代 root 中的每个文件.我怎样才能得到子目录 (a&b) ?

  However, It will iterate every files in root. How can I get just subdirectories (a&b) ?

  推荐答案

  没有必要使用深枚举.只需获取 contentsOfDirectoryAtURL 并过滤返回的目录 url.

  There is no need to use a deep enumeration. Just get contentsOfDirectoryAtURL and filter the urls returned which are directories.

  Xcode 11.4• Swift 5.2

  extension URL {
      func subDirectories() throws -> [URL] {
          // @available(macOS 10.11, iOS 9.0, *)
          guard hasDirectoryPath else { return [] }
          return try FileManager.default.contentsOfDirectory(at: self, includingPropertiesForKeys: nil, options: [.skipsHiddenFiles]).filter(\.hasDirectoryPath)
      }
  }
  

  ---

  用法:

  ---

  usage:

   do {
      let documentsDirectory =  try FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
      let url = documentsDirectory.appendingPathComponent("pictures", isDirectory: true)
      if !FileManager.default.fileExists(atPath: url.path) {
          try FileManager.default.createDirectory(at: url, withIntermediateDirectories: false, attributes: nil)
      }
      let subDirs = try documentsDirectory.subDirectories()
      print("sub directories", subDirs)
      subDirs.forEach { print($0.lastPathComponent) }
  } catch {
      print(error)
  }
  

  这篇关于使用 Swift 获取子目录的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！