title: UITableViewCell - Understanding "reuseable"
body: <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
  {
      static NSString *reuseIdentifier = @"cellReuse";
          UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseIdentifier];
          if (cell == nil) {
              cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier];
          }
  
          NSManagedObject *manageObject = [self.fetchResultController objectAtIndexPath:indexPath];
          cell.textLabel.text = [manageObject valueForKey:@"title"];
          cell.detailTextLabel.text = [manageObject valueForKey:@"subtitle"];
  
          return cell;
  }
  </code></pre>
  
  <p>I've read from a book that cell is a kind of "reuseable view". I have some problems in understanding the "reusable".</p>
  
  <p>Could anybody explain in an easy way about the mechanism of cell?</p>