让tableview的headview随着tableview的滑动逐渐隐藏的方法
-(void)scrollViewDidScroll:(UIScrollView*)scrollView
{
CGFloat sectionHeaderHeight=当前headview的高度;
if(scrollView.contentOffset.y<=sectionHeaderHeight & scrollView.contentOffset.y>=0){
scrollView.contentInset=UIEdgeInsetsMake(-scrollView.contentOffset.y,0,0,0);
}
elseif(scrollView.contentOffset.y>=sectionHeaderHeight){
scrollView.contentInset=UIEdgeInsetsMake(-sectionHeaderHeight,0,0,0);
}
}
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