kitchen_sink.py 文件源码

def build(self):
        main_widget = Builder.load_string(main_widget_kv)
        # self.theme_cls.theme_style = 'Dark'

        main_widget.ids.text_field.bind(
            on_text_validate=self.set_error_message,
            on_focus=self.set_error_message)

        self.nav_drawer = KitchenSinkNavDrawer()
        return main_widget