QTableWidgetItem 按数字排序

QTableWidgetItem* item = new QTableWidgetItem();

//按字母排序
 item->setText("2");

//按数值排序
item->setData(Qt::DisplayRole, 2); 

QTableWidget* widget = ....

widget->setItem(row, column, item );

//将第column列降序排列

widget->sortItem(column, Qt::DescendingOrder);