[Replace item(file)] #fs

replace_item.swift

let fs = FileManager.default

let docsURL = ...

// create first test file
let newFile = docs.appendingPathComponent("newFile.txt")
fs.createFile(
  atPath: newFile.path,
  contents: ...,
  attributes: nil)
// create second test file
let fileToReplace = docs.appendingPathComponent("fileToReplace.txt")
fs.createFile(
  atPath: fileToReplace.path,
  contents: ...,
  attributes: nil)

try? fs.replaceItem(
  at: fileToReplace,
  withItemAt: newFile,
  backupItemName: "contentOfOldFile.txt",
  options: .withoutDeletingBackupItem,
  resultingItemURL: nil
)