pyqt pyside QPushButton 图标（icon）大小自适应设置

img = QtGui.QImage(r'd:/test.png')

pixmap = QtGui.QPixmap(img)

fitPixmap = pixmap.scaled(64, 64, QtCore.Qt.IgnoreAspectRatio, QtCore.Qt.SmoothTransformation)    #注意 scaled() 返回一个 QtGui.QPixmap

icon = QtGui.QIcon(fitPixmap)

btn = QtWidgets.QPushButton()

btn.setIcon(fitPixmap)

btn.setIconSize(64, 64)