Python Kivy保持文本更新(刷新)

Question

我在Jetson Nano上运行了这个Kivy代码。MLX90614是连接到i2c的温度传感器。一旦运行，它将显示温度，但它不会更新/刷新。怎样才能让它不断地显示实际温度呢？

代码如下：

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

import board
import busio as io
import adafruit_mlx90614

i2c = io.I2C(board.SCL, board.SDA, frequency=100000)
mlx = adafruit_mlx90614.MLX90614(i2c)




class MainApp(App):
    def build(self):
        label = Label(text='This is the temperature: ' + str(mlx.object_temperature),
                      size_hint=(.5, .5),
                      pos_hint={'center_x': .5, 'center_y': .5})

        return label

if __name__ == '__main__':
    app = MainApp()
    app.run()

结果如下：

​

​

Answer 1

如下所示：

from kivy.clock import Clock

class MainApp(App):
    def build(self):
        self.label = Label(text='This is the temperature: ' + str(mlx.object_temperature),
                          size_hint=(.5, .5),
                          pos_hint={'center_x': .5, 'center_y': .5})
        Clock.schedule_interval(self.update_label, 0)

        return self.label
    
    def update_label(self, dt):
        self.label.text = "This is the temperature: {}".format(mlx.object_temperature)