#define screenHeightRadio (mainScreenHeight/(([[[UIDevice currentDevice] systemVersion] floatValue]>=7.0)?568.0:(568.0-20)))

/* UITableView  HeaderInSection 禁止 悬停 */
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGFloat sectionHeaderHeight = 20 * screenHeightRadio;
    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);
    }
}