Qt实现抽奖小游戏的三种方式

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
QT_FORWARD_DECLARE_CLASS(C_DlgSetting)
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
private slots:
    // 退出
    void slot_actQuit_triggered();
    // 设置概率
    void slot_actSetting_triggered();
    // 开始
    void slot_btnStart_clicked();
    // 停止
    void slot_btnStop__clicked();
private:
    Ui::MainWindow *ui;
    C_DlgSetting*       m_pDlgSetting; // 概率设置类
    bool                m_bFlag = false;// 标志
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "DlgSetting.h"
#include <QTime>
#include <QThread>
#include <QCoreApplication>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    // m_pDlgSetting = new C_DlgSetting(this);
    // 信号和槽
    {
        connect(ui->action_quit, &QAction::triggered, this, &MainWindow::slot_actQuit_triggered);
        connect(ui->action_setting, &QAction::triggered, this, &MainWindow::slot_actSetting_triggered);
        connect(ui->btn_start, &QPushButton::clicked, this, &MainWindow::slot_btnStart_clicked);
        connect(ui->btn_stop, &QPushButton::clicked, this, &MainWindow::slot_btnStop__clicked);
    }
    // 声明随机数种子，不然就是伪随机(每次产生的随机数都一样)
    qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
}
MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::slot_actQuit_triggered()
{
    close();
}
void MainWindow::slot_actSetting_triggered()
{
    // m_pDlgSetting->exec();
}
void MainWindow::slot_btnStart_clicked()
{
    if(m_bFlag)
    {
        return;
    }
    QStringList sl;
    sl << "一等奖" << "二等奖" << "三等奖" << "四等奖" << "五等奖";
    m_bFlag = true;
    while (m_bFlag) {
        int nRange = qrand() % 5;
        ui->label_turn->setText(sl.at(nRange));
        // 100ms转一次
        QThread::msleep(100);
        // 防止界面卡死
        QCoreApplication::processEvents();
    }
}
void MainWindow::slot_btnStop__clicked()
{
    m_bFlag = false;
    // 显示最终获奖结果
    QString strRes = QString("最终结果: %1").arg(ui->label_turn->text());
    ui->label_res->setText(strRes);
}

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

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QTimer>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
private slots:
    // 退出
    void slot_actQuit_triggered();
    // 开始
    void slot_btnStart_clicked();
    // 停止
    void slot_btnStop__clicked();
    // 定时器处理
    void slot_timeout();
private:
    Ui::MainWindow *ui;
    bool                m_bFlag = false;// 标志
    QTimer*             m_pTimer;// 定时器
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QTime>
#include <QThread>
#include <QCoreApplication>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    m_pTimer = new QTimer(this);
    // 处理
    connect(m_pTimer, &QTimer::timeout, this, &MainWindow::slot_timeout);
    // 信号和槽
    {
        connect(ui->action_quit, &QAction::triggered, this, &MainWindow::slot_actQuit_triggered);
        connect(ui->btn_start, &QPushButton::clicked, this, &MainWindow::slot_btnStart_clicked);
        connect(ui->btn_stop, &QPushButton::clicked, this, &MainWindow::slot_btnStop__clicked);
    }
    // 声明随机数种子，不然就是伪随机(每次产生的随机数都一样)
    qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
}
MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::slot_actQuit_triggered()
{
    close();
}
void MainWindow::slot_btnStart_clicked()
{
	// 此处可先判断定时器是否处于活动状态，如果是，则返回；否则，再启动
	// ToDoSomething
	{
	}
    m_pTimer->start(100);
}
void MainWindow::slot_btnStop__clicked()
{
    m_pTimer->stop();
    // 显示最终获奖结果
    QString strRes = QString("最终结果: %1").arg(ui->label_turn->text());
    ui->label_res->setText(strRes);
}
void MainWindow::slot_timeout()
{
    QStringList sl;
    sl << "一等奖" << "二等奖" << "三等奖" << "四等奖" << "五等奖";
    int nRange = qrand() % 5;
    ui->label_turn->setText(sl.at(nRange));
}