How to remove widget in Kivy and then create again? - kivy

Question

I am using Kivy and Kivymd.
There is a class Detail in my code where I am creating a card. I need to remove any card before creating a new card.
I have a func remove. I can use it to remove any cards, then create a new card. But I need to implement removing and creating in one func add.
My py file
from kivymd.app import MDApp
from kivy.uix.screenmanager import Screen, ScreenManager
from kivymd.uix.label import MDLabel
from kivymd.uix.card import MDCard
class WindowManager(ScreenManager):
pass
class Detail(Screen):
def __init__(self, **kwargs):
super().__init__(**kwargs)
def add(self, instance):
# self.remove()
article = self.ids.article.text
card = MDCard(size_hint=(None, None), padding=20)
my_label = MDLabel(text=article)
card.add_widget(my_label)
self.ids.box.add_widget(card)
def remove(self):
self.ids.boxlayout_1.clear_widgets()
self.add_widget(Detail())
class Container(Screen):
pass
class App(MDApp):
def build(self):
return WindowManager()
App().run()
my app.kv
<WindowManager>:
Container:
name: 'container'
Detail:
name: 'detail'
<Container>
MDRaisedButton:
pos_hint: {'center_x': .5, 'center_y': .5}
text: 'Go To Detail'
on_release: root.manager.current = 'detail'
<Detail>
BoxLayout:
id: boxlayout_1
orientation: 'vertical'
MDToolbar:
title: 'App'
Button:
id: btn
text: 'Remove Cards'
on_release: root.remove()
MDTextField:
id: article
hint_text: 'Input article'
helper_text_mode: "on_focus"
mode: 'rectangle'
MDRaisedButton:
id: me
text: 'add'
pos_hint: {'center_x': .5, 'center_y': .5}
on_release: root.add(root)
ScrollView:
MDList:
spacing: 5
id: box

Answer 1

Your remove() method is removing more than just the cards. Try changing it to just remove the Widgets in the MDList, like this:
def remove(self):
self.ids.box.clear_widgets()
Then the add() method can just call remove(), like this:
def add(self, instance):
self.remove()
article = self.ids.article.text
card = MDCard(size_hint=(None, None), padding=20)
my_label = MDLabel(text=article)
card.add_widget(my_label)
self.ids.box.add_widget(card)