#ifndef STOPWATCHWIN_H
#define STOPWATCHWIN_H
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#include <QMainWindow>
#include <QTime>
#include <QTimer>
namespace Ui {
class StopwatchWin;
}
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class StopwatchWin : public QMainWindow
{
? ? Q_OBJECT
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public:
? ? explicit StopwatchWin(QWidget *parent = nullptr);
? ? ~StopwatchWin();
? ? void fun_clicked();
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private slots:
? ? void on_pushButton_clicked();
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? ? void on_startBt_clicked();
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? ? void on_stopBtn_clicked();
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? ? void on_recordBtn_clicked();
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? ? void on_resertBt_clicked();
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private:
? ? Ui::StopwatchWin *ui;
? ? //QTime t;
? ? QTime t = QTime(0,0,0,0);
? ? QTimer mtimer;
};
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#endif // STOPWATCHWIN_H

#include "stopwatchwin.h"
#include "ui_stopwatchwin.h"
#include <QDebug>
StopwatchWin::StopwatchWin(QWidget *parent) :
? ? QMainWindow(parent),
? ? ui(new Ui::StopwatchWin)
{
? ? ui->setupUi(this);
? ? //把定時器信號與槽函數(shù)關聯(lián)
? ? connect(&mtimer, &QTimer::timeout, this, &StopwatchWin::fun_clicked);
}
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StopwatchWin::~StopwatchWin()
{
? ? delete ui;
}
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void StopwatchWin::fun_clicked()
{
? ? QString tim = t.toString("hh:mm:ss:zzz");
? ? t = t.addMSecs(10);
? ? ui->lcdNumber->display(tim);
? ? qDebug()<<"1111";
}
void StopwatchWin::on_startBt_clicked()
{
? ? qDebug()<<"啟動定時器";
? ? mtimer.start(10);
}
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void StopwatchWin::on_stopBtn_clicked()
{
? ? qDebug()<<"停止定時器";
? ? if(mtimer.isActive())
? ? {
? ? ? ? mtimer.stop();
? ? }
}
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void StopwatchWin::on_pushButton_clicked()
{
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}
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void StopwatchWin::on_recordBtn_clicked()
{
? ? QString tim = t.toString("hh:mm:ss:zzz");
? ? ui->textBrowser->append(tim);
}
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void StopwatchWin::on_resertBt_clicked()
{
? ?t = QTime(0,0,0,0);
}

#include "stopwatchwin.h"
#include <QApplication>
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int main(int argc, char *argv[])
{
? ? QApplication a(argc, argv);
? ? StopwatchWin w;
? ? w.show();
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? ? return a.exec();
}