headerview 滚动

//去掉UItableview headerview黏性 
- (void)scrollViewDidScroll:(UIScrollView *)scrollView { 
    if (scrollView == self.myTableView) 
    { 
        CGFloat sectionHeaderHeight = YOUR_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); 
        } 
    } 
}