先看看效果：

    

Qt窗口的消失简单动画Demo_Qt

核心代码：

QPropertyAnimation *animation = new QPropertyAnimation(this, "windowOpacity");
    animation->setDuration(3000);
    animation->setStartValue(1);
    animation->setEndValue(0);
    animation->start();
    connect(animation, SIGNAL(finished()), this, SLOT(close()));