摘自https://blog.csdn.net/imxiangzi/article/details/50742813，稍作修改
如下效果，点击某个位置：
focus.gif
**介绍一下Qt的聚焦策略 **
enum Qt::FocusPolicy
This enum type defines the various policies a widget can have with respect to acquiring keyboard focus.
图片.png
1、首先要设置窗口/控件的聚焦策略
通过designer设置
Qt::FocusPolicy的使用 - 柳北风儿 - 柳北风儿~~~~~~~欲宇仙炅
或者代码设置，这里最好重写一下目标控件，主要是他的focusInEvent 和focusOutEvent()
self.setFocusPolicy(QtCore.Qt.ClickFocus)
def focusInEvent(self, QFocusEvent):
print('focus in')
pix = QPixmap('icon/action2.png')
self.setPixmap(pix)
def focusOutEvent(self, QFocusEvent):
pix = QPixmap('icon/123.png')
self.setPixmap(pix)
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