怎样在Cell中使用第三方库加载图片

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

  

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifer forIndexPath:indexPath];

    UserModel *user=[UserModel getCurrentUser];

    cell.textLabel.text=[[GroupList groupsWithUser:user][indexPath.row] title];

    //加载图片

    [cell.imageView sd_setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://42.96.208.2:8080%@",user.image]]placeholderImage:[UIImage imageNamed:@"touxiang"]];

    return cell;

}