How to access some widget attribute from another widget in Kivy?

Question

Ok let\'s say I want that label in some widget to use text from label inside another widget:

:
    Label:
        text: str(root.         


        

Answer 1

1. The object property l probably gets populated after the first event loop iteration, while you are trying to access it within the first. You could delay it till the second iteration to make it work.

2. The most powerful approach is to bind those properties from inside python code, but there are some kv lang tricks to make it simpler. This is my favorite method:

BoxLayout

    Label
        id: label
        text: 'hello world'

    SubWidget
        label_text: label.text

<SubWidget@BoxLayout>
    label_text: 'none'

    Label
        text: root.label_text