QT布局管理器

#include "mainwindow.h"
#include <QApplication>
#include<QSpinBox>
#include<QSlider>
#include<QBoxLayout>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget window;
    window.setWindowTitle("Enter your age");
 
   QSpinBox *spinBox = new QSpinBox(&window);
    QSlider *slider = new QSlider(Qt::Horizontal, &window);
      spinBox->setRange(0, 130);
       slider->setRange(0, 130);
 
        QObject::connect(slider, &QSlider::valueChanged, spinBox, &QSpinBox::setValue);
        void (QSpinBox:: *spinBoxSignal)(int) = &QSpinBox::valueChanged;
        QObject::connect(spinBox, spinBoxSignal, slider, &QSlider::setValue);
        spinBox->setValue(35);
 
        QHBoxLayout *layout = new QHBoxLayout;
        layout->addWidget(spinBox);
        layout->addWidget(slider);
        window.setLayout(layout);
 
        window.show();
 
 
    return a.exec();
}