Pyqt5 learning pit encounter and pit drainage (3) background picture coverage button style and check button status

I used it all afternoon today designer, It 's a long story , There is a button problem 3 Hours .

One 、 How to modify the style when a button is clicked

problem ： Try to use at first btn.ischecked() and btn.isdown(), It didn't work . Later, I thought of using signals , Still fruitless , In despair , He showed up :btn.pressed(),btn.released()
The code is as follows ：

 self.pushButton_god.pressed.connect(self.change1)
 self.pushButton_god.released.connect(self.recovery1)

First act pressed The signal , It means to send a signal when the button is pressed
Second behavior released The signal , Indicates that a signal is emitted when the mouse is released

Two 、 Adding a background image to the window overrides the button style

problem ： As shown above ;
terms of settlement ： Set up style style .

# Set for window name
MainWindow.setObjectName("MainWindow")
# Set up QSS style 
myWin.setStyleSheet("#MainWindow {background-image:url(../img/map.jpg)}")

When we are right MainWindow When setting styles , Does not change the style of other controls .
#MainWindow As the key point