title: Get UITableViewCell from UITableView with cellForRowAtIndexPath
body: <p>I'm trying to get a subclassed UITableViewCell (class is called 'MasterCell') from my UITableViewController with an changing IndexPath. Let's say, I'll get the cell at the first row:</p>
  
  <pre><code>NSIndexPath *indexPath = [NSIndexPath indexPathForRow:1 inSection:0];
  MasterCell *cell = (MasterCell *)[self.tableView cellForRowAtIndexPath:indexPath];
  </code></pre>
  
  <p>This happens in my viewWillAppear method. Unfortunately, cell is nil while debugging. </p>
  
  <p>I have different cells / rows, where I have to change some values in the viewWillAppear method. Do you have any hints for me?</p>