int QObject::startTimer(int interval);//启动定时器,启动后,就会一直定时触发timerEvent事件，设置定时器间隔时间(单位ms),启动后返回该定时器ID号.void QObject::timerEvent(QTimerEvent * event);//定时器处理函数,需要用户来重写它,如果有多个定时器,可以通过QTimerEvent::timerId()来判断定时器ID处理void killTimer(int id);//通过定时器ID号来杀掉某个定时器

#ifndef WIDGET_H#define WIDGET_H#include 
    
     #include 
     
      class Widget : public QWidget{    Q_OBJECTprivate:virtual void  timerEvent( QTimerEvent * event );public:    explicit Widget(QWidget *parent = 0);};#endif // WIDGET_H
     
    

#include "Widget.h"#include 
    
     #include 
     
      Widget::Widget(QWidget *parent) :    QWidget(parent){     int TimerID = startTimer(1000);        //设置1000ms为单位     qDebug()<<"startTimerID : "<
      
       timerId();}
      
     
    

QTimer *timer = new QTimer(this);

connect(timer, SIGNAL(timeout()), this, SLOT(time_handler()));

timer->start (int msec);               //单位ms

timer->stop();

delete timer;

void   setSingleShot(bool singleShot);// 设置使能单次触发和多次触发,默认情况为多次触发bool   isActive();//判断定时器是否运行bool  setInterval ( int msec );//从新设置间隔时间

#ifndef WIDGET_H#define WIDGET_H#include 
    
     #include 
     
      class Widget : public QWidget{    Q_OBJECT    QTimer *timer;private slots:     void  time_handler();public:    explicit Widget(QWidget *parent = 0);};#endif // WIDGET_H
     
    

#include "Widget.h"#include 
    
     #include 
     
      Widget::Widget(QWidget *parent) :    QWidget(parent){     QTimer *timer = new QTimer(this);     connect(timer, SIGNAL(timeout()), this, SLOT(time_handler()));     timer->start(1000);        //1000ms}void Widget::time_handler(){    qDebug()<<"Timer out";}