plain样式下取消tableView分区头悬停

#pragma mark 取消分区头悬停
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

if(scrollView == _tableView) {
    
    CGFloat sectionHeaderHeight = 50 * SCALE_HEIGHT;
    if (scrollView.contentOffset.y <= sectionHeaderHeight && scrollView.contentOffset.y>=0)
    {
        scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
    }
    else if(scrollView.contentOffset.y >= sectionHeaderHeight)
    {
        scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);
    }
}
}