Kivy tutorial 08 countdown app implements timer call (tutorial includes source code)

Actual combat needs

count down App Realization timer call

Running effect

Solution

1. introduce Clock Components

  from kivy.clock import Clock

2. Clock Component implementation timer

	def on_start(self):
		Clock.schedule_interval(self.update, 0)

3. update Callback update interface

		def update(self, nap):
		# print('update')
		if self.sw_started:
			self.sw_seconds += nap
			
		m, s = divmod(self.sw_seconds, 60)
		self.root.ids.time.text = ('%02d:%02d.[size=40]%02d[/size]' %(int(m), int(s), int(s * 100 % 100)))

adopt on_press To specify the response function

Complete code

from kivy.app import App
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.utils import get_co