QTimer是一个计时器，现在把有用的东邪贴出来

//mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTime>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    void timerEvent(QTimerEvent *);
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
signals:
    void timeout();
public slots:
    void printFile();

public:
    void creatConnection();
    void Init();
private:
    Ui::MainWindow *ui;
    QTimer* printfpTimer;//QTimer
    int id1;
    int id2;
    int num = 0;
};

#endif // MAINWINDOW_H


//mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QTimerEvent>
#include <QTimer>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    printfpTimer = new QTimer(this);

    id1 = startTimer(5000);
    id2 = startTimer(2000);

    printfpTimer->start(1000);
    //printfpTimer->setInterval(100);
    creatConnection();
    printfpTimer->setSingleShot(false);//默认就是false,这行也可以不写

}



void MainWindow::creatConnection()
{
    connect(printfpTimer, SIGNAL(timeout()), this, SLOT(printFile()));
}



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

void MainWindow::printFile()
{
    static int num3=0;
    ui->lineEdit->setText(QString::number(num3++));
}

void MainWindow::timerEvent(QTimerEvent *event)
{
    if(event->timerId() == id1)
    ui->label_1->setText(QString::number(num++));
    static int num2=0;
    if(event->timerId() == id2)
    ui->label_2->setText(QString::number(num2++));
}
//.cpp文件--使用singleShot静态函数，此时不需要实例化QTimer
//QTimer::singleShot(10000, this, SLOT(onZipTodayFile()));


//main.cpp
#include "mainwindow.h"
#include <QApplication>
#include "Application.h"

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

    return a.exec();
}