如何将变量从一个QWizardPage传递到主QWizard

class MyWizard : public QWizard
{
    Q_OBJECT

public:
    explicit MyWizard(QWidget *parent = nullptr);

private:
    QString m_variable; // 要传递的变量

public slots:
    void receiveVariable(const QString &variable); // 槽函数，用于接收从QWizardPage传递过来的变量
};

class MyWizardPage : public QWizardPage
{
    Q_OBJECT

public:
    explicit MyWizardPage(QWidget *parent = nullptr);

signals:
    void sendVariable(const QString &variable); // 信号，用于将变量传递给主QWizard

private slots:
    void onNextButtonClicked(); // 槽函数，用于在点击下一步按钮时发送信号
};

MyWizard::MyWizard(QWidget *parent)
    : QWizard(parent)
{
    // ...
}

void MyWizard::receiveVariable(const QString &variable)
{
    m_variable = variable;
    // 在这里可以对变量进行处理或使用
}

MyWizardPage::MyWizardPage(QWidget *parent)
    : QWizardPage(parent)
{
    // ...
    connect(nextButton, &QPushButton::clicked, this, &MyWizardPage::onNextButtonClicked);
}

void MyWizardPage::onNextButtonClicked()
{
    QString variable = "要传递的变量";
    emit sendVariable(variable); // 发送信号，将变量传递给主QWizard
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    MyWizard wizard;
    MyWizardPage page;
    wizard.addPage(&page);

    QObject::connect(&page, &MyWizardPage::sendVariable, &wizard, &MyWizard::receiveVariable);

    wizard.show();

    return a.exec();
}