title: UIScrollView setContentSize
body: <p>i have one trouble, me need make scrollview with content of pdf(pages), this content has size of first 8 pages, and when i already see 8 page, i need expand content size for new pages and to do so, that scrollview show me new pages, but he shows pages from start scrollview again. </p>
  
  <p>What i need to implement? </p>