简单的QSpinbox和Qslider

mainwindow.cpp

<pre name="code" class="cpp">#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QSpinBox>
#include <QHBoxLayout>
#include <QLabel>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QWidget *window=new QWidget;
    this->setCentralWidget(window);

    QSpinBox *spinbox=new QSpinBox;
    spinbox->setRange(0,100);
    spinbox->resize(200,30);
//    spinbox->setValue(50);
    spinbox->setParent(window);
    spinbox->show();

    QSlider *slider=new QSlider(Qt::Horizontal);
    slider->setRange(0,100);
    slider->resize(200,30);
//    slider->setValue(50);
    slider->setParent(window);

    connect(spinbox,SIGNAL(valueChanged(int)),slider,SLOT(setValue(int)));
    connect(slider,SIGNAL(valueChanged(int)),spinbox,SLOT(setValue(int)));

    spinbox->setValue(50);

    QHBoxLayout *layout=new QHBoxLayout;
    layout->addWidget(spinbox);
    layout->addWidget(slider);
    window->setLayout(layout);


    window->show();

}

MainWindow::~MainWindow()
{
    delete ui;
}

main.cpp

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}