QSlider值改变信号

#include <QApplication>
#include <QSlider>
#include <QMessageBox>

class MyWidget : public QWidget
{
public:
    MyWidget(QWidget *parent = nullptr) : QWidget(parent)
    {
        QSlider *slider = new QSlider(Qt::Horizontal, this);
        connect(slider, &QSlider::valueChanged, this, &MyWidget::onSliderValueChanged);
    }

private slots:
    void onSliderValueChanged(int value)
    {
        QMessageBox::information(this, "Slider Value Changed", "New value: " + QString::number(value));
    }
};

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

    MyWidget widget;
    widget.show();

    return app.exec();
}