Kivy：ScreenManager问题

Question

I am struggling with Kivy's screen manager function. I want to set it up so that I can transition between screens, but I'm having trouble understanding the documentation. I think I may be misunderstanding because I am not very familiar with classes.

Trying to run this code causes a crash. It gives the error message:

   File "kivy\_event.pyx", line 254, in kivy._event.EventDispatcher.__init__ (kivy\_event.c:5332)
 TypeError: object.__init__() takes no parameters

I'd rather not mess around with the kivy language, please help me to understand how to make this work in python 3.

"""
Python 3.6.4
Kivy 1.10.0

Combines various .py files and
allows the game to run.
"""

__author__ = "RidiculousName"
__date__ = "Jan. 2018"

import sys
from kivy.app import App
from kivy.config import Config
from kivy.uix.image import Image
from kivy.uix.button import Button
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.screenmanager import ScreenManager, Screen


class MainMenu(FloatLayout):
    def __init__(self, **kwargs):
        super(MainMenu, self).__init__(**kwargs)

        # declares widget buttons
        background = Image(source="Img\\BG.png",
                           pos=(0, 0))

        start_button = Button(pos=(25, 75),
                              background_normal="Img\\Start.png",
                              background_down="Img\\Start_Down.png",
                              size_hint=(.1, .1))

        load_button = Button(pos=(225, 75),
                             background_normal="Img\\Load.png",
                             background_down="Img\\Load_Down.png",
                             size_hint=(.1, .1))

        options_button = Button(pos=(425, 75),
                                background_normal="Img\\Options.png",
                                background_down="Img\\Options_Down.png",
                                size_hint=(.15, .1))

        quit_button = Button(pos=(708, 75),
                             background_normal="Img\\Quit.png",
                             background_down="Img\\Quit_Down.png",
                             size_hint=(.1, .1))
        quit_button.bind(on_press=sys.exit)

        # Adds widgets in order
        self.add_widget(background)
        self.add_widget(start_button)
        self.add_widget(load_button)
        self.add_widget(options_button)
        self.add_widget(quit_button)



class BanditKing(App, ScreenManager):
    def build(self, **kwargs):
        super(BanditKing, self).__init__(**kwargs)

        sm = ScreenManager
        sm.add_widget(ScreenManager(name="MainMenu"))
        self.title = "Bandit King"
        self.icon = "Window_Icon.png"
        return sm



def main():
    Config.set("graphics", "width", "1600")
    Config.set("graphics", "height", "900")
    Config.write()
    BanditKing().run()


if __name__ == "__main__":
    main()

Answer 1

The widgets that you add to a ScreenManager should be type Screen . So MainMenu should extend Screen instead of FloatLayout . 'Screen' is a RelativeLayout , so it shouldn't affect your code much.

And your BanditKing class build() should create a ScreenManager and return it, rather than extend it:

class BanditKing(App):
    def build(self, **kwargs):
        super(BanditKing, self).__init__(**kwargs)
        sm = ScreenManager()
        sm.add_widget(MainMenu(name="MainMenu"))
        self.title = "Bandit King"
        self.icon = "Window_Icon.png"
        return sm