componentkit-bufferscroll

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
  if (scrolledToBottomWithBuffer(scrollView.contentOffset, scrollView.contentSize, scrollView.contentInset, scrollView.bounds)) {
    [self _enqueuePage:[_quoteModelController fetchNewQuotesPageWithCount:8]];
  }
}

static BOOL scrolledToBottomWithBuffer(CGPoint contentOffset, CGSize contentSize, UIEdgeInsets contentInset, CGRect bounds)
{
  CGFloat buffer = CGRectGetHeight(bounds) - contentInset.top - contentInset.bottom;
  const CGFloat maxVisibleY = (contentOffset.y + bounds.size.height);
  const CGFloat actualMaxY = (contentSize.height + contentInset.bottom);
  return ((maxVisibleY + buffer) >= actualMaxY);
}