qpushbutton 图片充满 icon大小设置

QPixmap pixmap = QPixmap(":/image/miniIcon/mute-off.png");ui->muteBtn->setIcon(pixmap);ui->muteBtn->setIconSize(QSize(32, 32));QPainter p(ui->muteBtn);//表示引擎应尽可能对图元的边缘进行抗锯齿。p.setRenderHint(QPainter::Antialiasing);

避免显示的图标过小，不需要自定义按钮，重写paintevent。