Kivy设置具有多个值的微调器下拉菜单的高度

from kivy.app import App
from kivy.uix.spinner import Spinner
from kivy.uix.dropdown import DropDown
from kivy.uix.boxlayout import BoxLayout

class CustomDropDown(DropDown):
    def __init__(self, **kwargs):
        super(CustomDropDown, self).__init__(**kwargs)
        self.height = 200  # 设置下拉菜单的高度

class MyApp(App):
    def build(self):
        layout = BoxLayout(orientation='vertical')
        spinner = Spinner(text='Select One',
                          values=('Option 1', 'Option 2', 'Option 3', 'Option 4'),
                          size_hint=(None, None),
                          size=(200, 44))
        dropdown = CustomDropDown()
        for option in spinner.values:
            btn = Button(text=option, size_hint_y=None, height=44)
            btn.bind(on_release=lambda btn: dropdown.select(btn.text))
            dropdown.add_widget(btn)
        spinner.bind(on_release=dropdown.open)
        dropdown.bind(on_select=lambda instance, x: setattr(spinner, 'text', x))
        layout.add_widget(spinner)
        return layout

if __name__ == '__main__':
    MyApp().run()