通过继承QSplashScreen类，得到CMySplashScreen类，然后在CMySplashScreen中定义QProgressBar变量，该变量以CMySplashScreen为父类，这样就实现了带进度条的启动界面。
进度条加入后，需要控制进度条的值，为了让进度条看起来更逼真，可以通过生成随机数的方式，把随机数当做进度条的值。此时，生成的随机数必须是从小到大排列的，要不然进度条就不会从开端一步步走到终点，而是会出现走到一半后又回到开端等反常现象。如何生成随机数可参考http://blog.csdn.net/caoshangpa/article/details/51036267
CMySplashScreen类的实现如下所示
#ifndef CMYSPLASHSCREEN_H #define CMYSPLASHSCREEN_H #include <QSplashScreen> #include <QPixmap> #include <QProgressBar> #include <QList> #include <QtGlobal> class CMySplashScreen: public QSplashScreen { Q_OBJECT public: CMySplashScreen(QPixmap& pixmap, int time); ~CMySplashScreen(); private: //进度条 QProgressBar *ProgressBar; //随机数列表 QList< int> numbersList; //启动界面停留的时间 int elapseTime; private: void setProgress(); void generateAscendRandomNumber(); private slots: void slotUpdateProgress(); }; #endif // CMYSPLASHSCREEN_H #include "cmysplashscreen.h" #include <QTime> #include <QTimer> CMySplashScreen::CMySplashScreen(QPixmap& pixmap, int time) : QSplashScreen(pixmap), elapseTime(time) { ProgressBar = new QProgressBar( this); //设置进度条的位置 ProgressBar->setGeometry( 0,pixmap.height() -50,pixmap.width(), 30); //设置进度条的样式 ProgressBar->setStyleSheet( "QProgressBar {color:black;font:30px;text-align:center; }QProgressBar::chunk {background-color: rgb(202, 165, 14);}"); //设置进度条的范围 ProgressBar->setRange( 0, 100); //设置进度条的当前进度 ProgressBar->setValue( 0); generateAscendRandomNumber(); setProgress(); } CMySplashScreen::~CMySplashScreen() { } void CMySplashScreen::setProgress() { int tempTime=elapseTime/ 100; for( int i= 0;i< 100;i++) { QTimer::singleShot(i*tempTime, this, SLOT(slotUpdateProgress())); } QTimer::singleShot(elapseTime, this, SLOT(close())); } void CMySplashScreen::slotUpdateProgress() { static int num= 0; ProgressBar->setValue(numbersList[num]); num++; } void CMySplashScreen::generateAscendRandomNumber() { int i; qsrand(QTime( 0, 0, 0).secsTo(QTime::currentTime())); //生成100个大小在[0,100]之间的随机数 for(i= 0;i< 100;i++) { numbersList.append(qrand()% 101); } //递增排序 qSort(numbersList.begin(),numbersList.end()); } 启动界面效果如下所示。