/*添加弹簧*/
QVBoxLayout* vboxLayout = new QVBoxLayout;
vboxLayout->addStretch();
 
/*删除弹簧*/
for (int i = 0; i <  pLayout->count(); ++i) 
{
        QLayoutItem *layoutItem = pLayout->itemAt(i);
 
        if (layoutItem->spacerItem())
        {
            pLayout->removeItem(layoutItem);
            --i;
        }
}
 
/*转载出:https://www.jianshu.com/p/daf9c035f883*/