表格单元指示符问题

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

  static NSString *identifier = @"Cell";
  UITableViewCell *cell = ... // The cell come from reuse queue.
  if (cell == nil) {
      cell = ... // if reuse queue has no cell, then create an autoreleased cell
  } 

  // Configure cell by indexPath.
  // You should configure cell HERE.

}

    for(int iterator=0;iterator<3;iterator++)
    {

        UITableViewCell *eachCell = [[self tableView] cellForRowAtIndexPath:[NSIndexPath indexPathForRow:iterator inSection:0]];
        [eachCell setSelected:NO animated:YES];
        [eachCell setAccessoryType:UITableViewCellAccessoryNone];
    }

    UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
    [newCell setSelected:YES animated:YES];
    [newCell setAccessoryType:UITableViewCellAccessoryCheckmark];