如何在kivy中更改gridLayout中特定按钮的颜色

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button

class CustomGridLayout(GridLayout):
    def change_button_color(self, button_id, color):
        button = self.ids[button_id]
        button.background_color = color

class MyApp(App):
    def build(self):
        layout = GridLayout(cols=2)
        custom_grid = CustomGridLayout()
        layout.add_widget(custom_grid)
        return layout

class CustomGridLayout(GridLayout):
    def __init__(self, **kwargs):
        super(CustomGridLayout, self).__init__(**kwargs)
        self.cols = 2

        button1 = Button(text='Button 1', id='button1')
        button2 = Button(text='Button 2', id='button2')

        self.add_widget(button1)
        self.add_widget(button2)

class MyApp(App):
    def build(self):
        layout = GridLayout(cols=2)
        custom_grid = CustomGridLayout()
        layout.add_widget(custom_grid)

        # 调用change_button_color方法来更改按钮颜色
        custom_grid.change_button_color('button1', (1, 0, 0, 1))  # 设置按钮1为红色

        return layout