Why Is Switching Screens Not Working In Kivy?

I am trying to switch screens in kivy and I have been stuck on this for a while so I don't know what is going on. The text is being printed but the screen is still not changing. He

Solution 1:

It appears that you are confusing classes and instances. In your switch_button() method your code:

ScreenManager.current = "FileScreen"

is setting the current attribute of the ScreenManager class, but the current property is an instance property and must be set on an instance of ScreenManager. And it must be the instance that is managing the FileScreenScreen.

A better coding of the switch_button() method:

classMainScreen(Screen):
    defswitch_button(self):
        print("switching")
        self.manager.current = "FileScreen"

The self.manager is a reference to the ScreenManager that is managing the MainScreen, which is also managing the FileScreen.

Elsewhere, you are making a similar confusion between class and instance:

MainScreen.switch_button(self)

Again, you need the instance of MainScreen, not the MainScreen class. This line can be replaced by:

self.root.get_screen('MainScreen').switch_button()

This code uses the get_screen() method of ScreenManager to access the instance of MainScreen, then calls the instance method switch_button().

A more direct approach would be to replace that line with:

self.root.current = 'FileScreen'