title: How can I display a imageView only once in a cell of tableView?
body: <p>I'm developing a application which uses a TableView. And I'd like to add a ImageView for helping operation of user on detail view. In other words when user tap a cell in the tableview, the imageview is showed on the detail view <strong>only once</strong> for helping operation of user.</p>
  
  <p>What should I do to implement such specifications? </p>