title: UITableView load more cells
body: <p>I want to add more cells when user scrolls to the end of list in table view.
  I found this topic (<a href="https://stackoverflow.com/questions/14171414/table-view-load-more-cell">Table View load more cell?</a>), but... is this OK to use "reloadData"? For example, we have 100 cell in table view, and for adding new 20 cells we will reload whole table view?</p>