我尝试了您的代码,它可以工作,但是我添加到您的代码中的唯一内容是,我将svg文件路径放入其中QString,并补充QGraphicsScene说我确定您也有这个。我将它推送到这个 repo 中供您测试:
https://bitbucket.org/parisa_HR/stackoverflow/src/master/
QGraphicsScene *scene2 = new QGraphicsScene(this);
QImage image(scene2->width(), scene2->height(), QImage::Format_ARGB32);
QSvgRenderer *renderer = new QSvgRenderer(QString(":/svgs/fire.svg")); // path of .svg file
QPainter painter(&image);
renderer->render(&painter);
QGraphicsSvgItem *f = new QGraphicsSvgItem();
f->setSharedRenderer(renderer);
scene2->setSceneRect(QRectF(0, 0, scene2->width(), scene2->height()));
scene2->addItem(f);
ui->view->setScene(scene2);
ui->view->show();

更新:
我更改了我的 SVG 文件并添加了一个jpeg文件作为背景示例。
但它有效。

我也尝试过png。
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enable-background="new 0 0 512 512"
height="512"
viewBox="0 0 512 512"
width="512"
version="1.1"
sodipodi:docname="fire.svg"
inkscape:version="1.1 (ce6663b3b7, 2021-05-25)"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns="http://www.w3.org/2000/svg"
xmlns:svg="http://www.w3.org/2000/svg">
<defs
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pagecolor="#505050"
bordercolor="#eeeeee"
borderopacity="1"
inkscape:pageshadow="0"
inkscape:pageopacity="0"
inkscape:pagecheckerboard="0"
showgrid="false"
inkscape:zoom="0.35976819"
inkscape:cx="144.53751"
inkscape:cy="523.94848"
inkscape:window-width="1366"
inkscape:window-height="670"
inkscape:window-x="0"
inkscape:window-y="27"
inkscape:window-maximized="1"
inkscape:current-layer="Capa_1" />
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作为您发送的文件:
