QT5 设置按钮图标自适应大小

QPushButton *button = new QPushButton(this);

button->setGeometry(50, 50, 100, 50);

button->setStyleSheet("border-image:url(:/timg.jpg)");

connect(button, &QPushButton::pressed, [=](){

    button->setStyleSheet("border-image:url(:/myico.ico)");}

);

connect(button, &QPushButton::released, [=](){

    button->setStyleSheet("border-image:url(:/timg.jpg)"); }

);