Qt QSplashScreen 启动GIF动画显示静止帧

Question

使用QSplashScreen 启动GIF动画 ，设置的3秒窗口延迟，GIF在三秒内是静止的，
等窗口初始化完成之后GIF才动

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QPixmap pixmap(440,175);
    QSplashScreen splash(pixmap);

    QLabel *label=new QLabel(&splash);
    QMovie *movie=new QMovie(":/test.gif");

    label->setMovie(movie);
    movie->start();

    splash.show();

    a.processEvents();
    Widget w;
    //w.show();
    //splash.close();//测试注释掉了
    return a.exec();
}

Answer 1

这样确实是不行的，只会静止。可以用计时器每帧更新画面：

#include <QApplication>
#include <QSplashScreen>
#include <QMovie>
#include <QTimer>

void UpdateGif(QSplashScreen *screen, QMovie *movie)
{
    screen->setPixmap(movie->currentPixmap());
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QPixmap pixmap(440, 175);
    auto screen = new QSplashScreen(pixmap);

    auto movie = new QMovie(":/test.gif");
    movie->start();

    auto timer = new QTimer(screen);
    QTimer::connect(timer, &QTimer::timeout, [=]
    {
        UpdateGif(screen, movie);
    });
    timer->start();

    screen->show();

    return QApplication::exec();
}