//头部拉伸效果

//头部拉伸效果

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

{

    CGPoint point = scrollView.contentOffset;

    if (point.y < -kHEIGHT) {

        CGRect rect = [self.tableView viewWithTag:101].frame;

        rect.origin.y = point.y;

        rect.size.height = -point.y;

        [self.tableView viewWithTag:101].frame = rect;

    }

}

//头部拉伸效果

原文：http://www.cnblogs.com/lrr0618/p/5756031.html