使用迭代的Kivy DropDown列表

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.dropdown import DropDown
from kivy.uix.button import Button

class MyDropDown(DropDown):
    def __init__(self, **kwargs):
        super(MyDropDown, self).__init__(**kwargs)
        for i in ['Option 1', 'Option 2', 'Option 3']:
            btn = Button(text=i, size_hint_y=None, height=44)
            btn.bind(on_release=lambda btn: self.select(btn.text))
            self.add_widget(btn)

class MyApp(App):
    def build(self):
        layout = BoxLayout(orientation='vertical')
        main_button = Button(text='Select Option', size_hint=(None, None))
        dropdown = MyDropDown()
        main_button.bind(on_release=dropdown.open)
        dropdown.bind(on_select=lambda instance, x: setattr(main_button, 'text', x))
        layout.add_widget(main_button)
        return layout

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