UIRefreshControlで引っ張って更新をする ref: http://qiita.com/myaaaaa_chan/items/fc3adb23d16171de5abe

file0.m

- (void)viewDidLoad
{
    [super viewDidLoad];

UIRefreshControl *refreshControl = [[UIRefreshControl alloc]init];

// 更新アクションを設定
[refreshControl addTarget:self action:@selector(onRefresh:) forControlEvents:UIControlEventValueChanged];

// UITableViewControllerにUIRefreshControlを設定
self.refreshControl = refreshControl;
}

- (void)onRefresh:(id)sender
{
    // 更新開始
    [self.refreshControl beginRefreshing];

    // 更新処理をここに記述

    // 更新終了
    [self.refreshControl endRefreshing];
}