区头区尾跟随滑动

区头区尾跟随滑动

- (void)scrollViewDidScroll:(UIScrollView*)scrollView {

    CGFloatsectionHeaderHeight =40;

    CGFloatsectionFooterHeight =40;

    CGFloatoffsetY = scrollView.contentOffset.y;

    if(offsetY >=0&& offsetY <= sectionHeaderHeight)

    {

        scrollView.contentInset=UIEdgeInsetsMake(-offsetY,0, -sectionFooterHeight,0);

    }elseif(offsetY >= sectionHeaderHeight && offsetY <= scrollView.contentSize.height- scrollView.frame.size.height- sectionFooterHeight)

    {

        scrollView.contentInset=UIEdgeInsetsMake(-sectionHeaderHeight,0, -sectionFooterHeight,0);

    }elseif(offsetY >= scrollView.contentSize.height- scrollView.frame.size.height- sectionFooterHeight && offsetY <= scrollView.contentSize.height- scrollView.frame.size.height)

    {

        scrollView.contentInset=UIEdgeInsetsMake(-offsetY,0, -(scrollView.contentSize.height- scrollView.frame.size.height- sectionFooterHeight),0);

    }

}