【QT】设计一个秒表（跑步计时器）

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设计目标

1. 定时器开始

2.复位从0开始计时

3.记录--把记录的时间添加到QTextBrowser， append（时间）

4. QTime t(0,0,0)   t = t.addMsec( number )  t.toString (“hh:mm:ss:zzz”)

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定时器（QTimer）的使用

定时器---定时发送信号timeout
QTimer 定时器类
1.创建定时器类对象
QTimer mtimer;
2.把定时器信号与槽函数关联
connect(&mtimer, &QTimer::timeout, this, &TimerWin::on_outBt_clicked);
3.启动定时器
mtimer.start(1000);
4.停止定时器
mtimer.stop();

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QT Creator组件布局

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运行效果

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源码

stopwatchwin.h

#ifndef STOPWATCHWIN_H
#define STOPWATCHWIN_H

#include <QMainWindow>
#include <QTime>
#include <QTimer>
namespace Ui {
class StopwatchWin;
}

class StopwatchWin : public QMainWindow
{
    Q_OBJECT

public:
    explicit StopwatchWin(QWidget *parent = nullptr);
    ~StopwatchWin();
    void fun_clicked();

private slots:
    void on_pushButton_clicked();

    void on_startBt_clicked();

    void on_stopBtn_clicked();

    void on_recordBtn_clicked();

    void on_resertBt_clicked();

private:
    Ui::StopwatchWin *ui;
    //QTime t;
    QTime t = QTime(0,0,0,0);
    QTimer mtimer;
};

#endif // STOPWATCHWIN_H

stopwatchwin.cpp

#include "stopwatchwin.h"
#include "ui_stopwatchwin.h"
#include <QDebug>
StopwatchWin::StopwatchWin(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::StopwatchWin)
{
    ui->setupUi(this);
    //把定时器信号与槽函数关联
    connect(&mtimer, &QTimer::timeout, this, &StopwatchWin::fun_clicked);
}

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

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()<<"启动定时器";
    mtimer.start(10);
}

void StopwatchWin::on_stopBtn_clicked()
{
    qDebug()<<"停止定时器";
    if(mtimer.isActive())
    {
        mtimer.stop();
    }
}

void StopwatchWin::on_pushButton_clicked()
{

}

void StopwatchWin::on_recordBtn_clicked()
{
    QString tim = t.toString("hh:mm:ss:zzz");
    ui->textBrowser->append(tim);
}

void StopwatchWin::on_resertBt_clicked()
{
   t = QTime(0,0,0,0);
}

main.cpp

#include "stopwatchwin.h"
#include <QApplication>

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

    return a.exec();
}