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本文主要总结一个自定义的计时器（不是定时器），该计时器每隔一秒钟刷新一次。博主封装一个函数timeCounter()，获取每一秒的时分秒数值，封装函数返回值是一个QStringList值，里面依次返回时、分、秒三个值；封装函数代码如下：
QStringList Widget::timeCounter(){/*最多计算：24天=2073600000ms，也就是576小时*/int elapsed = time->elapsed()/1000;short int hour = 0;short int minute = 0;short int second = 0;if(elapsed>=3600){/*n hour*/hour=elapsed/3600;elapsed =elapsed%3600;}else if(elapsed>=60){/*n minute*/minute=elapsed/60;second =elapsed%60;}else if(elapsed<60){/*n second*/second =elapsed;}return QStringList()<具体的工程示例如下所述。
1.1新建一个widget工程，不要勾选ui界面。然后分别在widget.h、widget.cpp、main.cpp分别添加如下代码。
widget.h
#ifndef WIDGET_H#define WIDGET_H#include #include class Widget : public QWidget{Q_OBJECT public:
Widget(QWidget *parent = 0);~Widget();QStringList timeCounter();private:void setupUI();QTime *time;QTimer *timer;private slots:void slot_startedTimer_clicked(bool);void slot_stopedTimer_clicked(bool);void slot_timer_timeout();};#endif // WIDGET_Hwidget.cpp
#include "widget.h"#include #include #include #include #include #include #include Widget::Widget(QWidget *parent): QWidget(parent){setupUI();}Widget::~Widget(){}void Widget::setupUI(){QVBoxLayout* mainLayout = new QVBoxLayout;mainLayout->setMargin(0);mainLayout->setSpacing(0);QPushButton *startedTimer = new QPushButton(tr("计时器start"));connect(startedTimer,SIGNAL(clicked(bool)),this,SLOT(slot_startedTimer_clicked(bool)));QPushButton *stopedTimer = new QPushButton(tr("计时器stop"));connect(stopedTimer,SIGNAL(clicked(bool)),this,SLOT(slot_stopedTimer_clicked(bool)));mainLayout->addWidget(startedTimer);mainLayout->addWidget(stopedTimer);mainLayout->addStretch();this->setLayout(mainLayout);/*初始化时间*/time = new QTime();timer = new QTimer();connect(timer,SIGNAL(timeout()),this,SLOT(slot_timer_timeout()));}void Widget::slot_startedTimer_clicked(bool){qDebug()<start();timer->start(1000);}void Widget::slot_stopedTimer_clicked(bool){qDebug()<stop();}void Widget::slot_timer_timeout(){qDebug()<elapsed()/1000;short int hour = 0;short int minute = 0;short int second = 0;if(elapsed>=3600){/*n hour*/hour=elapsed/3600;elapsed =elapsed%3600;}else if(elapsed>=60){/*n minute*/minute=elapsed/60;second =elapsed%60;}else if(elapsed<60){/*n second*/second =elapsed;}return QStringList()< main.cpp
#include "widget.h"#include int main(int argc, char *argv[]){QApplication a(argc, argv);Widget w;w.resize(960,640);w.show();return a.exec();} 1.2程序构建和运行结果如下图所示：
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