Kivy:使用按钮更新TextInput元素

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

class MyLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(MyLayout, self).__init__(**kwargs)
        self.orientation = 'vertical'

        self.input = TextInput()
        self.add_widget(self.input)

        self.button = Button(text='更新', on_press=self.update_text_input)
        self.add_widget(self.button)

    def update_text_input(self, instance):
        # 在此处实现更新TextInput元素的逻辑
        self.input.text = 'Hello, World!'

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

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