QT 点击按钮后， 弹出菜单

添加菜单和选项

void MainWindow::init()
{
    QList lists;
    QAction *save = new QAction("Save", this);
    QAction *load = new QAction("Load", this);
    QAction *load_default = new QAction("Load default"); //恢复默认设置
    QAction *manager = new QAction("Data Manager", this);
    QMenu *mfile = new QMenu;
    QMenu *save_load = new QMenu;
    lists << save << load << load_default; //读取配置页的3个选项，分别是存储， 读取， 恢复出厂设置
    save_load->addActions(lists);
    save_load->setTitle("Settings");
    mfile->addMenu(save_load);
    mfile->addAction(manager);
    ui->btn_file->setMenu(mfile);
}

事件槽函数的实现

connect( save, SIGNAL(triggered()), this, SLOT(save_settings())); //保存当前配置
connect( load, SIGNAL(triggered()), this, SLOT(load_settings())); //读取配置文件
connect( load_default, SIGNAL(triggered()), this, SLOT(load_default_settings())); //恢复出厂设置

 

然后在构造函数调用init函数