[MacOS]SavePanel/OpenPanel

儲存檔案：

let savePanel = NSSavePanel()
savePanel.canCreateDirectories = true
savePanel.showsTagField = false
savePanel.nameFieldStringValue = "localFile.txt"
savePanel.level = NSWindow.Level(rawValue: Int(CGWindowLevelForKey(.modalPanelWindow)))
savePanel.begin { (result) in
  if result.rawValue == NSApplication.ModalResponse.OK.rawValue {
    do{
      try self.writeTextView.string.write(to: savePanel.url!, atomically: true, encoding: .utf8)
    }
    catch{
      NSLog("save Error")
    }
  }
}

開啟檔案：

let readPanel = NSOpenPanel()
readPanel.title                   = "Choose a .txt file";
readPanel.showsResizeIndicator    = true;
readPanel.showsHiddenFiles        = false;
readPanel.canChooseDirectories    = true;
readPanel.canCreateDirectories    = true;
readPanel.allowsMultipleSelection = false;
readPanel.allowedFileTypes        = ["txt"];
if (readPanel.runModal() == NSApplication.ModalResponse.OK) {
//reading
            
  do {
    readTextView.string = try String(contentsOf: readPanel.url!, encoding: .utf8)
  }
  catch {
    NSLog("read Error")
  }
}