UIPageControl showing incorrect page

Question

I've got a UIScrollView containing several tables, and a UIPageControl keeping track of which page the user is currently viewing. It works fine UNTIL i start scrolling up on the tableview, at which point the UIPageControl adjusts and says (incorrectly) that we are on the first page.

Here is my code:

- (void)scrollViewDidScroll:(UIScrollView *)_scrollView {
  if (pageControlIsChangingPage) {
    return;
  }

  /*
   *  We switch page at 50% across
   */
  CGFloat pageWidth = _scrollView.frame.size.width;
  int page = floor((_scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
  pageControl.currentPage = page;
}

and then this as well:

- (void)scrollViewDidEndDecelerating:(UIScrollView *)_scrollView {
  pageControlIsChangingPage = NO;
}

Not sure what exactly is causing this to happen . . . any ideas? Im stumped :(

Answer 1

I believe the issue was that both the UITableView and the UIScrollView, since they both had the delegates set to self, were calling the same scrollview methods. I added a tag to the main scrollview, and then accounted for it by performing a check on the Tag when adjusting the page, like so

if (_scrollView.tag == 100) {

CGFloat pageWidth = _scrollView.frame.size.width;
int page = floor((_scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = page;

}

finally