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);}");
- //设置进度条的样式
- 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。
源码链接：见http://blog.csdn.net/caoshangpa/article/details/51037427的评论