使用线程更新Kivy标签

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.clock import Clock
import threading

class MyBoxLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(MyBoxLayout, self).__init__(**kwargs)
        self.label = Label(text="Initial Text")
        self.add_widget(self.label)

class MyApp(App):
    def build(self):
        layout = MyBoxLayout()
        # 启动一个线程来更新标签
        threading.Thread(target=self.update_label).start()
        return layout

    def update_label(self):
        # 模拟耗时操作
        import time
        time.sleep(5)
        # 使用Clock.schedule_once方法在主线程中更新标签
        Clock.schedule_once(self.update_label_text)

    def update_label_text(self, dt):
        # 在主线程中更新标签的文本
        self.root.label.text = "Updated Text"

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