//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;

}

}