尝试在Python Kivy中重置时钟计划

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

class ClockLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(ClockLayout, self).__init__(**kwargs)
        
        self.orientation = 'vertical'
        
        self.clock_label = Label(text='00:00:00')
        self.add_widget(self.clock_label)
        
        self.reset_button = Button(text='Reset', on_press=self.reset_clock)
        self.add_widget(self.reset_button)
        
        self.clock_event = None
        
    def start_clock(self):
        self.clock_event = Clock.schedule_interval(self.update_clock, 1)
        
    def update_clock(self, dt):
        # 更新时钟显示
        pass
        
    def reset_clock(self, instance):
        # 重置时钟计划
        pass

def reset_clock(self, instance):
    if self.clock_event:
        self.clock_event.cancel()
    self.clock_label.text = '00:00:00'

class ClockApp(App):
    def build(self):
        return ClockLayout()

def build(self):
    clock_layout = ClockLayout()
    clock_layout.start_clock()
    return clock_layout