将标签添加到IM/聊天屏幕kivy

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

class ChatScreen(BoxLayout):
    def __init__(self, **kwargs):
        super(ChatScreen, self).__init__(**kwargs)
        
        # 创建标签并设置属性
        label1 = Label(text='Sender: John', size_hint=(1, None), height=30)
        label2 = Label(text='Type: Text', size_hint=(1, None), height=30)
        label3 = Label(text='Content: Hello, how are you?', size_hint=(1, None), height=30)
        
        # 将标签添加到聊天屏幕中
        self.add_widget(label1)
        self.add_widget(label2)
        self.add_widget(label3)

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

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