如何在Kivy中跨多个屏幕更新ID值

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button

# 定义全局变量来存储ID值
global_id = 0

class MainScreen(Screen):
    def __init__(self, **kwargs):
        super(MainScreen, self).__init__(**kwargs)

        # 创建控件来显示和编辑ID值
        self.label = Label(text=str(global_id))
        self.text_input = TextInput(text=str(global_id))
        self.update_button = Button(text="Update ID", on_release=self.update_id)

        # 添加控件到屏幕布局中
        self.add_widget(self.label)
        self.add_widget(self.text_input)
        self.add_widget(self.update_button)

    def update_id(self, instance):
        # 更新ID值
        new_id = int(self.text_input.text)
        global_id = new_id
        self.label.text = str(global_id)

class OtherScreen(Screen):
    def __init__(self, **kwargs):
        super(OtherScreen, self).__init__(**kwargs)

        # 创建控件来显示ID值
        self.label = Label(text=str(global_id))

        # 添加控件到屏幕布局中
        self.add_widget(self.label)

# 创建一个屏幕管理器，添加多个屏幕
screen_manager = ScreenManager()
screen_manager.add_widget(MainScreen(name="main"))
screen_manager.add_widget(OtherScreen(name="other"))

class MyApp(App):
    def build(self):
        return screen_manager

if __name__ == '__main__':
    MyApp().run()