qt中格子布局删除布局中的控件，行数未减少

Question

//原先这个格子布局中有4个按钮，现在删除第一个的按钮，在最后以后添加一个按钮。
QLayoutItem* pDeleteItem(NULL);
pDeleteItem = m_pGridLayout->itemAt(0);
if(pDeleteItem != NULL)
{
QWidget* pWidget = pDeleteItem->widget();
m_pGridLayout->removeWidget(pWidget);
pWidget->setParent(NULL);
delete pWidget;
pWidget = NULL;
}

    QPushButton* pPushButton = new QPushButton(QString::number(m_iReplaceRow+1),ui->frame);
    if(pPushButton != NULL)
    {
        m_pGridLayout->addWidget(pPushButton,m_iReplaceRow,0);
    }
    qDebug()<<m_pGridLayout->rowCount();

Answer 1

http://blog.csdn.net/yuxiaohen/article/details/8936208