縮放居中
QPixmap pix = QPixmap::fromImage(m_QImg); ui.label->setAlignment(Qt::AlignCenter); ui.label->setPixmap(pix.scaled(ui.label->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation));
圖片適應控件
ui.label->setScaledContents(true);
控件適應圖片
QPixmap pix = QPixmap::fromImage(m_QImg); ui.label->setPixmap(pix); //圖像顯示在label上 ui.label->adjustSize(); //控件適應圖像(注意必須放到上一句代碼之後)