更改Kivy自定义按钮类中的文本

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout

class CustomButton(Button):
    def __init__(self, **kwargs):
        super(CustomButton, self).__init__(**kwargs)
        self.text = "Initial Text"
        self.bind(on_press=self.change_text)

    def change_text(self, instance):
        self.text = "Text Changed!"

class MyApp(App):
    def build(self):
        layout = BoxLayout(orientation='vertical')
        custom_button = CustomButton(text="Click Me")
        layout.add_widget(custom_button)
        return layout

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

<CustomButton>:
    text: "Initial Text"
    on_press: self.change_text()

<MyApp>:
    BoxLayout:
        orientation: 'vertical'
        CustomButton:
            text: "Click Me"

class CustomButton(Button):
    def __init__(self, **kwargs):
        super(CustomButton, self).__init__(**kwargs)
        self.text = "Initial Text"
        self.bind(on_press=self.change_text)  # 确保这里正确绑定

    def change_text(self, instance):
        self.text = "Text Changed!"