-(void)scrollViewDidScroll: (UIScrollView*)scrollView
{
floatscrollViewHeight = scrollView.frame.size.height;
floatscrollContentSizeHeight = scrollView.contentSize.height;
floatscrollOffset = scrollView.contentOffset.y;
if(scrollOffset ==0)
{
// 滚动到了顶部
}
elseif(scrollOffset + scrollViewHeight == scrollContentSizeHeight)
{
// 滚动到了底部
}
}
