效果图

源码

.h 文件

protected slots:

    void onMenuTriggered(QAction*);

.cpp 文件

// 菜单

    QMenu *pMenu = new QMenu(this);

    pMenu->addAction(QString::fromLocal8Bit("我"));

    pMenu->addSeparator();

    pMenu->addAction(QString::fromLocal8Bit("爱"));

    QMenu *pChildMenu = new QMenu(this);

    pChildMenu->setTitle(QStringLiteral("学"));

    pChildMenu->addAction(QStringLiteral("Q"));

    pMenu->addMenu(pChildMenu);

    QAction *act1 = new QAction(pChildMenu);

    act1->setText(QStringLiteral("t"));

    act1->setIcon(QIcon("src/Me.png"));

    pChildMenu->addAction(act1);

    QPushButton *pButton = new QPushButton(this);

    // 按钮

    pButton->setText(QString::fromLocal8Bit("主菜单"));

    // 设置菜单

    pButton->setMenu(pMenu);

    connect(pMenu, SIGNAL(triggered(QAction*)), this, SLOT(onMenuTriggered(QAction*)));

void MyClass::onMenuTriggered(QAction *action)

{

    QString str = action->text();

}