Im using kivy, and i have two screens, one has class variables which are numeric properties and i have methods which change the value according to the situation. The second screen should be used to display final values to the user.
class Main(Screen):
transport_price_value = NumericProperty(0)
def change_value_on_press(self):
self.transport_price_value += 10
class Second(Screen):
def display_transport_price_value(self):
return str(Main.transport_price_value)
class WindowManager(ScreenManager):
pass
class Example(App):
pass
When i click the submit button which triggers "display_transport_price_value" function it returns the name istead of the value of the property
>Solution :
Since Main is just a class and not an instance, and since in python it is possible to have multiple instances, what you really need is a way to get the Main instance created by kivy. I have not tested but I think this will work:
class Main(Screen):
transport_price_value = NumericProperty(0)
def change_value_on_press(self):
self.transport_price_value += 10
class Second(Screen):
def display_transport_price_value(self):
main_screen = self.manager.get_screen("main")
return str(main_screen.transport_price_value)
class WindowManager(ScreenManager):
pass
class Example(App):
pass
Source: https://stackoverflow.com/a/61002677/13314450