title: Reusable cell in UITableView
body: <p>I'm using a <code>UITableView</code> and a custom cell with a <code>checkbox</code>.
  I have more than 1 section. When a check a checkbox in the first section, for example the cell with row = 0 and section = 0, I save the data and it works. But the cell in the row = 0 and section = 1 is also checked! How can I make the difference between those sections ? </p>
  
  <p>Thank you so much!</p>