- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    UIScrollView * scrollView = [[UIScrollView alloc] init];
    scrollView.backgroundColor = [UIColor whiteColor];
    //ページ数分の横幅を確保します
    scrollView.contentSize = CGSizeMake(320.0 * PAGE_COUNT, 400.0f);
    //1ページごとにめくれるように設定。これがないと中途半端な位置で止まります。
    scrollView.pagingEnabled = YES;
    for(int i = 0; i < PAGE_COUNT; i++){//ページの中身を作成
        UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake(320.0f * i, 0, 100, 100)];
        label.text = [NSString stringWithFormat:@"%d", i];
        label.font = [UIFont fontWithName:label.font.fontName size:40.0f];
        label.textAlignment = UITextAlignmentCenter;
        label.backgroundColor = [UIColor yellowColor];
        [scrollView addSubview:label];
    }
    //ナビゲーションコントロールの中に設定してみます。
    UIViewController * scrollViewController = [[UIViewController alloc] init];
    scrollViewController.view = scrollView;    
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:scrollViewController];
    self.window.rootViewController = navigationController;
   
    [self.window makeKeyAndVisible];
    return YES;
}

//以下の行を起動メソッドに追加
    scrollView.delegate = self;

//ApplicationDelegate.mに以下のメソッドを追加
-(void)scrollViewDidScroll:(UIScrollView *)_scrollView{
    scrollViewController.title = [NSString stringWithFormat:@"%d", (int)round(_scrollView.contentOffset.x / 320.0f) + 1];
}