无法更改button的颜色和buttontext的颜色，使用qstyle自己画pushbutton，在风格选项中设置的palette解决思路

void CommentWidget::paintEvent(QPaintEvent *e){    QPainter painter(this);    painter.save();    painter.setRenderHint(QPainter::Antialiasing);//开启边缘反锯齿    QSize size=this->size();    qDebug()<<size;QPalette palette=QPalette(Qt::white);    //画刷的活动颜色组    palette.setBrush(QPalette::Window,Qt::lightGray);//窗口背景颜色    palette.setBrush(QPalette::WindowText,Qt::black);//窗口前景颜色    palette.setBrush(QPalette::Base,Qt::white);    palette.setBrush(QPalette::AlternateBase,Qt::lightGray);    palette.setBrush(QPalette::Text,Qt::black);    palette.setBrush(QPalette::Button,Qt::white);//按钮颜色    palette.setBrush(QPalette::ButtonText,Qt::red);//按钮文字颜色//画底部按钮    QStyleOptionButton opt;    opt.initFrom(this);opt.text = "Reply";    opt.rect=QRect(size.width()-180,size.height()-70+10,80,50);    opt.state=QStyle::State_Enabled;    opt.fontMetrics=QApplication::fontMetrics();    opt.palette=palette;this->style()->drawControl(QStyle::CE_PushButton,&opt,&painter,this);painter.restore();}