1.在布局中增加控件:
ui->verticalLayout->addWidget(chartView);
2.在布局中清除控件:
// 删除布局中所有的控件
while(ui->verticalLayout->count())
{
QWidget *p=this->ui->verticalLayout->itemAt(0)->widget();
p->setParent (NULL);
this->ui->verticalLayout->removeWidget(p);
delete p; // 清除内存
}