python-3.x - kivymd 属性错误 : 'MDNavigationDrawer' object has no attribute 'toggle_state'

Question

示例代码似乎有点过时，例如我不得不用“MDNavigationLayout”替换“NavigationLayout”。

我正在使用从 github 下载的最新 kivymd

这是simplest example我发现了，但是 example code here有同样的问题:

from kivymd.app import MDApp
from kivy.lang import Builder
from kivy.core.window import Window



Window.size = (300, 500)

navigation_helper = """
Screen:
    MDNavigationLayout:
        ScreenManager:
            Screen:
                BoxLayout:
                    orientation: 'vertical'
                    MDToolbar:
                        title: "Navigation Drawer"
                        elevation: 10
                        left_action_items: [['menu', lambda x: nav_drawer.toggle_nav_drawer()]]
                    Widget:
        MDNavigationDrawer:
            id: nav_drawer
"""


class DemoApp(MDApp):

    def build(self):
        screen = Builder.load_string(navigation_helper)
        return screen


DemoApp().run()

Answer 1

替换

#left_action_items: [['menu', lambda x: nav_drawer.toggle_nav_drawer()]]

与

left_action_items: [['menu', lambda x: nav_drawer.set_state('toggle')]]

似乎有效