why I can't change the color of progressbar ?

[navid]

hello

why I can't change the color of progressbar ?

QPalette pal;
    QList<QProgressBar *> pblist = parent->findChildren<QProgressBar *>();
    if(!pblist.isEmpty()){
        foreach(QProgressBar* ouptr, pblist){
            pal = ouptr->palette();
            pal.setColor(QPalette::Highlight, Qt::red);
            ouptr->setPalette(pal);
            ouptr->setValue(50);
        }
    }

QPalette pal;
    QList<QProgressBar *> pblist = parent->findChildren<QProgressBar *>();
    if(!pblist.isEmpty()){
        foreach(QProgressBar* ouptr, pblist){
            pal = ouptr->palette();
            pal.setColor(QPalette::Highlight, Qt::red);
            ouptr->setPalette(pal);
            ouptr->setValue(50);
        }
    }

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