cell分割线出现空白

• (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
  if ([tableView respondsToSelector:@selector(setLayoutMargins:)]) {
  [tableView setLayoutMargins:UIEdgeInsetsZero];
  }
  if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
  [cell setLayoutMargins:UIEdgeInsetsZero];
  }
  if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
  [cell setSeparatorInset:UIEdgeInsetsZero];
  }
  }