QToolButton

 addwidget()必须在setObjectName()之后

ui->btn->setStyle(QApplocation::style());

    connect(ui->pushButton, &QPushButton::toggled, this, [=](bool checked) {
        qDebug() << "Button toggled, new state:" << checked;
        if(checked){
            emit ui->pushButton->clicked(checked);
        }
    });