表单加载后如何运行函数Kivy [英] How do I run a function once the form is loaded Kivy

问题描述

我在python中有一个kivy程序，它有一个文本框和一些按钮.我已经用kivy语言编写了ui，我需要运行一个函数来更新文本框并等待用户按下按钮.当所有小部件都已加载时，是否可以使用on_load属性或某种东西来运行此功能. .kv文件:

I have a kivy program in python which has a textbox and a few buttons. I have written the ui in kivy language and I need to run a function which updates the text box and waits for the user to press a button. Is there an on_load property I can use or some sort of thing to run this function when all the widgets have been loaded. The .kv file:

<MainGui>:
   id: layout1
   orientation: 'horizontal'
   #I would like for some sort of event like below to run my function:
   on_load: root.myfunction()

推荐答案

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

class DemoApp(App):

    def build(self):
        self.layout = layout = BoxLayout()
        layout.label = Label(text="INITIAL TEXT")
        layout.add_widget(layout.label)
        return(self.layout)

    def on_start(self, **kwargs):
        self.layout.label.text = "APP LOADED"

DemoApp().run()

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