1、获取屏幕参数

    QList<QScreen *> screen_list= QGuiApplication::screens();for(int i=0;i<screen_list.count();i++){qDebug()<<screen_list.at(i)->size();             //屏幕的像素分辨率qDebug()<<screen_list.at(i)->availableGeometry();//屏幕尺寸}

2、设置

this->setGeometry(qApp->desktop()->availableGeometry());