按KIvy按钮更改python代码中的标签文本

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

class MyApp(App):
    def build(self):
        # 在这里构建应用程序的UI界面
        pass

class MyApp(App):
    def build(self):
        layout = BoxLayout(orientation='vertical')
        
        # 创建一个按钮，并定义按钮点击事件的回调函数
        button = Button(text='点击我', on_release=self.change_label_text)
        
        # 创建一个标签，用于显示文本
        self.label = Label(text='原始文本')
        
        # 将按钮和标签添加到布局中
        layout.add_widget(button)
        layout.add_widget(self.label)
        
        return layout

class MyApp(App):
    def build(self):
        layout = BoxLayout(orientation='vertical')
        
        button = Button(text='点击我', on_release=self.change_label_text)
        self.label = Label(text='原始文本')
        
        layout.add_widget(button)
        layout.add_widget(self.label)
        
        return layout
    
    def change_label_text(self, button):
        self.label.text = '新的文本'