Python 3.Kivy。有没有办法限制在TextInput小部件中输入的文本？

from kivy.app import App
from kivy.uix.textinput import TextInput
from kivy.uix.boxlayout import BoxLayout
import re

class MyBoxLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(MyBoxLayout, self).__init__(**kwargs)
        self.orientation = 'vertical'
        
        # 创建一个TextInput小部件，并设置input_filter属性为限制输入为数字的正则表达式
        self.text_input = TextInput(multiline=False, input_filter='int')
        self.add_widget(self.text_input)

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

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