QTimer类使用方法。

widget.h

#ifndef WIDGET_H#define WIDGET_H#include <QWidget>#include <QTimer>namespace Ui {class Widget;}class Widget : public QWidget{    Q_OBJECTpublic:    explicit Widget(QWidget *parent = 0);    ~Widget();PRivate slots:    void on_buttonStart_clicked();    void on_buttonStop_clicked();    void on_buttonClear_clicked();private:    Ui::Widget *ui;    QTimer *myTimer;};#endif // WIDGET_Hwidget.cpp
#include "widget.h"#include "ui_widget.h"Widget::Widget(QWidget *parent) :    QWidget(parent),    ui(new Ui::Widget){    ui->setupUi(this);    myTimer = new QTimer(this);    this->setWindowTitle("我的定时器");    connect(myTimer, &QTimer::timeout,            [=]()            {                static int i = 0;                i++;                ui->lcdNumber->display(i);            }            );}Widget::~Widget(){    delete ui;}void Widget::on_buttonStart_clicked(){    //启动定时器，时间间隔为100毫秒，每个100毫秒定时器自动触发myTimer的timeout信号    myTimer->start(100);}void Widget::on_buttonStop_clicked(){    myTimer->stop();}void Widget::on_buttonClear_clicked(){    ui->lcdNumber->display(0);}main.cpp
#include "widget.h"#include <Qapplication>int main(int argc, char *argv[]){    QApplication a(argc, argv);    Widget w;    w.show();    return a.exec();}