使用进度条调用Kivy应用程序的顺序线程

from kivy.app import App
from kivy.uix.progressbar import ProgressBar
from kivy.uix.boxlayout import BoxLayout
from kivy.clock import Clock
from kivy.lang import Builder

Builder.load_string('''
<ProgressLayout>:
    orientation: 'vertical'
    ProgressBar:
        id: progress_bar
        max: 100
        value: 0
    Button:
        text: 'Start'
        on_release: root.start_progress()
''')

class ProgressLayout(BoxLayout):
    def start_progress(self):
        # 在这里编写顺序线程的逻辑
        pass

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

class ProgressLayout(BoxLayout):
    def start_progress(self):
        # 创建顺序线程
        thread = threading.Thread(target=self.update_progress)
        thread.start()

    def update_progress(self):
        for i in range(101):
            # 更新进度条的值
            self.ids.progress_bar.value = i
            # 调用Clock.schedule_once()方法更新UI
            Clock.schedule_once(lambda dt: self.update_ui(), 0.1)
            # 模拟耗时操作
            time.sleep(0.1)

    def update_ui(self):
        # 更新UI的逻辑
        pass