1 QPixmap fitpixmap=image.scaled(ui->label->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation); 2 ui->label->setPixmap(fitpixmap); 3 ui->label->setAlignment(Qt::AlignCenter); 4 ui->label->show();
原文：https://www.cnblogs.com/ybqjymy/p/13433691.html