read-write-directory-permissions.swift

guard let window = view.window else { print("Nope") ; return }
let panel = NSOpenPanel()
panel.canChooseFiles = false
panel.canChooseDirectories = true
panel.allowsMultipleSelection = false
panel.canCreateDirectories = true
panel.beginSheetModal(for: window) { (result) in
 if result == NSFileHandlingPanelOKButton {
    self.folderPath = panel.urls[0]
  }
}

var isStale: Bool = false
let defaults:UserDefaults = UserDefaults.standard

var folderPath: URL? {
  didSet {
    do {
        let bookmark = try folderPath?.bookmarkData(options: .withSecurityScope, includingResourceValuesForKeys: nil, relativeTo: nil)
            defaults.set(bookmark, forKey: "bookmark")
        } catch let error as NSError {
            print("Set Bookmark Fails: \(error.description)")
        }
    }
}

if let bookmarkData = defaults.object(forKey: "bookmark") as? NSData {
  do {
    let url = try? URL(resolvingBookmarkData: bookmarkData as Data, bookmarkDataIsStale: &isStale)
      url??.startAccessingSecurityScopedResource()
     } catch let error as NSError {
      print("Bookmark Access Fails: \(error.description)")
     }
 }