【Qt官方视频码农】Qt_04-Signals_and_Slots

#include "mainwindow.h"
#include "ui_mainwindow.h"

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

//自定义信号连接发送与接收【激活 触发 类
//把滚动条的值发送给进度条progressBar
connect(ui->horizontalSlider,SIGNAL(valueChanged(int))
,ui->progressBar,SLOT(setValue(int)));
//把滚动条的值发送给进度条progressBar_2
connect(ui->horizontalSlider,SIGNAL(valueChanged(int))
,ui->progressBar_2,SLOT(setValue(int)));

}

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

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

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

return a.exec();
}