Scroll view paging

#pragma mark - UIScrolViewDelegate

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    CGFloat pageWidth = scrollView.frame.size.width;
    float fractionalPage = scrollView.contentOffset.x / pageWidth;
    
    NSInteger page = lround(fractionalPage);
    
    if (page == 0) {
        [self setFirstPageSelected];
    }
    if (page == 1) {
        [self setSecondPageSelected];
    }
    if (page == 2) {
        [self setThirdPageSelected];
    }
    
    if (self.currentPage == 2 && fractionalPage > 2.0) {
        [self showRegister];
    }
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    [self stoppedScrolling:scrollView];
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    if (!decelerate) {
        [self stoppedScrolling:scrollView];
    }
}

- (void)stoppedScrolling:(UIScrollView *)scrollView
{
    CGFloat pageWidth = scrollView.frame.size.width;
    float fractionalPage = scrollView.contentOffset.x / pageWidth;
    
    self.currentPage = lround(fractionalPage);
}

#pragma mark - Paging

- (void)scrollToPage:(int)page
{
    [self.scrollView setContentOffset:CGPointMake(self.view.width * page, 0) animated:NO];
}