pageNumber = 1;

-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    NSInteger currentOffset = scrollView.contentOffset.y;
    NSInteger maximumOffset = scrollView.contentSize.height - scrollView.frame.size.height;

    if (maximumOffset - currentOffset <= - 40 && hasNextPage)
    {
        [self fetchData];

        pageNumber += 1;
    }
}

-(void)fetchData
{
    // request and load data
}