why kivy ids dictionary become empty ?

[Degenerate Tech]

python==3.10.12

Kivy ==v2.3.0

kivymd== 2.0.1.dev0

from kivy.lang import Builder

from kivymd.uix.screen import MDScreen
from kivymd.uix.screenmanager import MDScreenManager
from kivymd.app import MDApp
from kivy.clock import Clock
KV = '''
SM:
    MDScreenManager:
        id:sm

<MScreen>:
    md_bg_color: self.theme_cls.backgroundColor

    MDScrollView:

        MDBoxLayout:
            orientation: "vertical"
            spacing: "20dp"
            adaptive_height: True
            size_hint_x: .8
            pos_hint: {"center_x": .5, "center_y": .5}

            MDTextField:
                mode: "filled"
                radius:'25dp'
                MDTextFieldLeadingIcon:
                    icon: "magnify"
                    theme_icon_color: "Custom"
                    icon_color_normal: "lightgreen"

                MDTextFieldHintText:
                    text:"Search..."
                MDTextFieldTrailingIcon:
                    icon: "information"
            MDTextField:
                mode: "filled"
                radius:'25dp'
                MDTextFieldLeadingIcon:
                    icon: "magnify"
                    theme_icon_color: "Custom"
                    icon_color_normal: "lightgreen"

                MDTextFieldHintText:
                    text:"Search..."
                MDTextFieldTrailingIcon:
                    icon: "information"

           

       
'''

class SM(MDScreen):
    def __init__(self,*args,**kargs):
        super().__init__(*args,**kargs)
    def on_kv_post(self,obj):
        print("##",self.ids)

        #self.ids.sm.add_widget(MScreen())

class MScreen(MDScreen):pass


class Example(MDApp):
    def build(self):
        self.theme_cls.primary_palette = "Olive"
        Builder.load_string(KV)
        return SM()



Example().run()

[elli...@cox.net]

Change your app class as below:

class Example(MDApp):
    def build(self):
        self.theme_cls.primary_palette = 

"Olive"
        return Builder.load_string(KV)

You were declaring a root widget in both python and kv.

---

From: kivy-...@googlegroups.com <kivy-...@googlegroups.com> on behalf of Degenerate Tech <sksah...@gmail.com>
Sent: Friday, April 19, 2024 1:24 AM
To: Kivy users support <kivy-...@googlegroups.com>
Subject: [kivy-users] why kivy ids dictionary become empty ?

 

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