Qt为界面添加背景

重写paintEvent(QPaint* event)

.h:

private:

    void paintEvent(QPaintEvent* event);

.cpp

void 窗口对象::paintEvent(QPaintEvent* event)

{

    QPixmap  pixmap = QPixmap("*.jpg").scaled(this->size());//pixmap对象

    QPainter painter(this);

    painter.drawPixmap(this->rect(), pixmap);//绘制

}