- (void)viewDidLoad
{
    [super viewDidLoad];

    scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;
    pageControl.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
}

- (void)contentSize
{
    buttonArray = [[NSArray alloc] initWithObjects:@"circle.png", @"square.png", @"triangle.png", nil];

    for (int i = 0; i < [buttonArray count]; i++) {

        CGRect frame;
        frame.origin.x = self.scrollView.frame.size.width * i;
        frame.origin.y = 0;
        frame.size = self.scrollView.frame.size;

        UIImageView *imageView = [[UIImageView alloc] initWithFrame:frame];
        imageView.image = [UIImage imageNamed:[buttonArray objectAtIndex:i]];
        [self.scrollView addSubview:imageView];
    }

    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * [buttonArray count], scrollView.frame.size.height);
}

- (void)viewDidLayoutSubviews
{
    [self contentSize];
}

- (void)scrollViewDidScroll:(UIScrollView *)sender
{
    CGFloat pageWidth = scrollView.frame.size.width;
    int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
    self.pageControl.currentPage = page;
}