title: Height is 0 for table view cells that added by registering nib.
body: <p>I have a custom <code>UITableViewCell</code> built in a separate xib file, and I added it into my table view dynamically by calling:</p>
  
  <p><code>[self.tableview registerNib:theNib forCellReuseIdentifier:theIdentifier];</code></p>
  
  <p>I returned the height in <code>[tableView:heightForRowAtIndexPath:]</code> like this:</p>
  
  <p><code>return ((UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:theIdentifier]).frame.size.height;</code></p>
  
  <p>The problem is, every time the hight return is 0. </p>
  
  <p>Is there anyway to return the height correctly (should be height of cell in the xib file) except hard code it?</p>