如何在使用RecycleView滚动时保持Kivy ToggleButton状态？

from kivy.uix.recycleview import RecycleView
from kivy.uix.togglebutton import ToggleButton
from kivy.adapters.listadapter import ListAdapter
from kivy.uix.recycleview.views import RecycleDataViewBehavior

class ToggleButtonWithData(RecycleDataViewBehavior, ToggleButton):
    pass

class RecycleViewAdapter(ListAdapter):
    def __init__(self, **kwargs):
        super(RecycleViewAdapter, self).__init__(**kwargs)
        self.toggle_states = [False] * len(self.data)

    def on_data_update(self, data):
        self.toggle_states = [False] * len(data)
        super(RecycleViewAdapter, self).on_data_update(data)

    def populate(self, view, data):
        view.text = data['text']
        view.state = 'down' if self.toggle_states[data['index']] else 'normal'

    def toggle_button_state(self, index):
        self.toggle_states[index] = not self.toggle_states[index]

class MyRecycleView(RecycleView):
    def __init__(self, **kwargs):
        super(MyRecycleView, self).__init__(**kwargs)
        self.adapter = RecycleViewAdapter(data=[{'text': 'Item {}'.format(i), 'index': i} for i in range(100)])

    def toggle_button_state(self, index):
        self.adapter.toggle_button_state(index)