Kivy:单选按钮的正确实现

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.togglebutton import ToggleButton

class MyLayout(GridLayout):
    def __init__(self, **kwargs):
        super(MyLayout, self).__init__(**kwargs)
        self.cols = 1  # 设置布局为一列

        # 创建单选按钮
        self.button1 = ToggleButton(text='Option 1')
        self.button2 = ToggleButton(text='Option 2')
        self.button3 = ToggleButton(text='Option 3')

        # 绑定按钮的选择事件
        self.button1.bind(on_press=self.on_button_press)
        self.button2.bind(on_press=self.on_button_press)
        self.button3.bind(on_press=self.on_button_press)

        # 将按钮添加到布局中
        self.add_widget(self.button1)
        self.add_widget(self.button2)
        self.add_widget(self.button3)

    def on_button_press(self, instance):
        # 取消其他按钮的选择状态
        if instance == self.button1:
            self.button2.state = 'normal'
            self.button3.state = 'normal'
        elif instance == self.button2:
            self.button1.state = 'normal'
            self.button3.state = 'normal'
        elif instance == self.button3:
            self.button1.state = 'normal'
            self.button2.state = 'normal'

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

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