title: Is there any way to inform every on screen UITableViewCell when viewWillDisappear?
body: <p>I have a <code>UITableViewController</code> and a <code>MyTableViewCell</code> subclassing <code>UITableViewCell</code>.</p>
  <p>I want to inform all the on-screen <code>MyTableViewCell</code>'s to do something related to their properties. How can I approach this?</p>
  <p>Or, is there any way to get all the &quot;instances&quot; of on screen cells?</p>
  <p>Thanks!</p>