int index = ui->tabWidget->currentIndex();
ui->tabWidget->setCurrentIndex(1);
QWidget* currWidget = ui->tabWidget->widget(ui->tabWidget->currentIndex());
QWidget *Tab1 = new QWidget();
ui->tabWidget->addTab(Tab1, "TabName"); //TabName为QTabBar显示的名称
ui->tabWidget->removeTab(index); //index为指定位置索引
ui->tabWidget->insertTab(index); //index为指定位置索引