qt删除控件

void UtilitiesTool::clearLayout(QLayout* layout)
{
    while (QLayoutItem* item = layout->takeAt(0))
    {
        if (QWidget* widget = item->widget())
        	widget->setParent(NULL);
            widget->deleteLater();
 
        if (QLayout* childLayout = item->layout())
            clearLayout(childLayout);
 
        if (QSpacerItem* spaerItem = item->spacerItem())
            layout->removeItem(spaerItem);
 
        delete item;
    }
}