sorting-acceptDrop.swift

func tableView(tableView: NSTableView, acceptDrop info: NSDraggingInfo, row: Int, dropOperation: NSTableViewDropOperation) -> Bool {

  var pasteboard = info.draggingPasteboard()

  var rowData = pasteboard.dataForType(MyRowType)

  if(rowData != nil) {

    var dataArray = NSKeyedUnarchiver.unarchiveObjectWithData(rowData!) as! Array<NSIndexSet>,

        indexSet = dataArray[0]

    var movingFromIndex = indexSet.firstIndex

    var item = items[movingFromIndex] as! String

    // ...work to move the item

    return true
  }
  else {
    return false
  }
}