UIScrollView and UIPageControl set Page scrollView, set Page on Page controller

gistfile1.m

static CGSize scrollSize; // set on viewDidLoad 

- (CGRect)frameForPosition:(int)pos
{
    float x = pos * scrollSize.width;
    float y = 0;
    float width = scrollSize.width;
    float height = scrollSize.height;
    
    return CGRectMake (x, y, width, height);
}


- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGFloat pageWidth = scrollSize.width;
    float fractionalPage = self.scrollView.contentOffset.x / pageWidth;
    NSInteger page = lround(fractionalPage);
    self.pageControl.currentPage = page; 
}