【Swift】ファイルやディレクトリ操作するための extension をまずは作った 👉 https://android.benigumo.com/20240608/file-ex/

FileManageExtensions.swift

extension URL {
  var exists: Bool {
    isFile || isDirectory
  }

  var isFile: Bool {
    (try? resourceValues(forKeys: [.isRegularFileKey]))?.isRegularFile == true
  }

  var isDirectory: Bool {
    (try? resourceValues(forKeys: [.isDirectoryKey]))?.isDirectory == true
  }

  var directoryEntryCount: Int {
    (try? resourceValues(forKeys: [.directoryEntryCountKey]).directoryEntryCount) ?? 0
  }

  var fileSize: String {
    let size = (try? resourceValues(forKeys: [.fileSizeKey]).fileSize) ?? 0
    return size.formatted(.byteCount(style: .file))
  }

  var modified: Date {
    try! resourceValues(forKeys: [.contentModificationDateKey]).contentModificationDate!
  }

  func shortPath(percentEncoded: Bool = true) -> String {
    path(percentEncoded: percentEncoded)
      .replacingOccurrences(
        of: URL.homeDirectory.path(percentEncoded: percentEncoded),
        with: "/HOME/"
      )
  }
}

extension FileManager {
  private func contents(directory url: URL) -> [URL] {
    (try? contentsOfDirectory(at: url, includingPropertiesForKeys: nil, options: [])) ?? []
  }

  func showContents(_ url: URL = .documentsDirectory) {
    print(
      String(format: "%@ %@", url.shortPath(), url.isFile ? "[\(url.fileSize)]" : "")
    )

    if url.isDirectory {
      contents(directory: url)
        .sorted(by: {
          let lr = [$0, $1].map {
            ($0.path().components(separatedBy: "/").dropLast().joined(), $0.path())
          }
          return lr[0] < lr[1]
        })
        .forEach { content in
          showContents(content)
        }
    }
  }
}

// ex. 
let manager = FileManager.default
let documents = URL.documentsDirectory

print(documents.shortPath())
// /HOME/Documents/

manager.showContents(documents)
// /HOME/Documents/
// /HOME/Documents/another/
// /HOME/Documents/another/copied.txt [6 bytes]
// /HOME/Documents/some/
// /HOME/Documents/some/copied.txt [6 bytes]
// /HOME/Documents/some/moved.txt [6 bytes]

print()

print(documents.exists)
// true

print(documents.isDirectory)
// true

print(documents.isFile)
// false

print(documents.isFileURL) // built-in
// true

print(documents.directoryEntryCount)
// 2

print(documents.fileSize)
// Zero kB

print(documents.modified)
// 2024-06-08 11:33:07 +0000

print(documents.shortPath(percentEncoded: true))
// /HOME/Documents/


let dummy = documents.appending(component: "dummy")

print(dummy.shortPath())
// /HOME/Documents/dummy

manager.showContents(dummy)
// /HOME/Documents/dummy

print(dummy.exists)
// false

print(dummy.isDirectory)
// false

print(dummy.isFile)
// false

print(documents.isFileURL) // built-in
// true

print(dummy.directoryEntryCount)
// 0

print(dummy.fileSize)
// Zero kB

//print(dummy.modified)
// crash