如何将此保存到我的应用程序所在的位置

Question

将数据保存到文件

let fileName = "Test"
let DocumentDirURL = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)

let fileURL = DocumentDirURL.appendingPathComponent(fileName).appendingPathExtension("txt")
print("FilePath: \(fileURL.path)")

let writeString = "Write this text to the fileURL as text in iOS using Swift"
do {
    // Write to the file
    try writeString.write(to: fileURL, atomically: true, encoding: String.Encoding.utf8)
} catch let error as NSError {
    print("Failed writing to URL: \(fileURL), Error: " + error.localizedDescription)
}

var readString = "" // Used to store the file contents
do {
    // Read the file contents
    readString = try String(contentsOf: fileURL)
} catch let error as NSError {
    print("Failed reading from URL: \(fileURL), Error: " + error.localizedDescription)
}
print("File Text: \(readString)")

如何保存Test.txt文件以保存我的App目录。我不知道这会将文本文件保存到哪里。