如何在用户输入后更改QButtongroup元素中QPushbutton中的文本？

#include <QtWidgets>

class MyWidget : public QWidget
{
public:
    MyWidget(QWidget *parent = nullptr)
        : QWidget(parent)
    {
        // 创建QButtonGroup和QPushButton对象
        QButtonGroup *buttonGroup = new QButtonGroup(this);
        QPushButton *button1 = new QPushButton("Button 1");
        QPushButton *button2 = new QPushButton("Button 2");

        // 将QPushButton添加到QButtonGroup中
        buttonGroup->addButton(button1);
        buttonGroup->addButton(button2);

        // 创建一个QLineEdit控件用于用户输入
        QLineEdit *lineEdit = new QLineEdit(this);

        // 连接信号和槽函数
        connect(lineEdit, &QLineEdit::textChanged, this, [=](const QString &text){
            // 获取被选中的QPushButton对象
            QPushButton *selectedButton = qobject_cast<QPushButton*>(buttonGroup->checkedButton());
            if (selectedButton) {
                // 更改QPushButton的文本
                selectedButton->setText(text);
            }
        });

        // 创建布局并添加控件
        QVBoxLayout *layout = new QVBoxLayout(this);
        layout->addWidget(button1);
        layout->addWidget(button2);
        layout->addWidget(lineEdit);
        setLayout(layout);
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MyWidget widget;
    widget.show();
    return app.exec();
}