我的kv代碼有問題。我想用幾個NavigationDrawerIconButtons創建一個MDNavigationDrawer。窗口會出現，但當我單擊MDToolbar時，程序崩潰并顯示此錯誤消息。在Traceback (most recent call last):

File "C:/Users/path/to/my/file/main.py", line 189, in

KivyGUI().run()

File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\app.py", line 855, in run

runTouchApp()

File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\base.py", line 504, in runTouchApp

EventLoop.window.mainloop()

File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\core\window\window_sdl2.py", line 746, in mainloop

self._mainloop()

File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\core\window\window_sdl2.py", line 478, in _mainloop

EventLoop.idle()

File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\base.py", line 342, in idle

self.dispatch_input()

File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\base.py", line 327, in dispatch_input

post_dispatch_input(*pop(0))

File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\base.py", line 293, in post_dispatch_input

wid.dispatch('on_touch_up', me)

File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch

File "C:\Users\uname\Anaconda3\lib\site-packages\kivymd\ripplebehavior.py", line 84, in on_touch_up

return super().on_touch_up(touch)

File "C:\Users\uname\Anaconda3\lib\site-packages\kivymd\button.py", line 480, in on_touch_up

return super().on_touch_up(touch)

File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\uix\behaviors\button.py", line 179, in on_touch_up

self.dispatch('on_release')

File "kivy\_event.pyx", line 703, in kivy._event.EventDispatcher.dispatch

File "kivy\_event.pyx", line 1214, in kivy._event.EventObservers.dispatch

File "kivy\_event.pyx", line 1138, in kivy._event.EventObservers._dispatch

File "C:\Users\path\to\my\file\design.kv", line 59, in

left_action_items: [['dots-vertical', lambda x: root.toggle_nav_drawer()]]

File "kivy\weakproxy.pyx", line 32, in kivy.weakproxy.WeakProxy.__getattr__

AttributeError: 'LayoutPy' object has no attribute 'toggle_nav_drawer'

我從一個單獨的文件導入kv代碼。在

^{pr2}$

Python代碼：import sys

import kivy

from kivy.app import App

from kivy.uix.floatlayout import FloatLayout

from kivy.uix.boxlayout import BoxLayout

from kivy.core.window import Window

from kivymd.theming import ThemeManager

from kivymd.label import MDLabel

from kivymd.textfields import MDTextField, MDTextFieldClear, MDTextFieldRect, MDTextFieldRound

from kivy.lang import Builder

from kivymd.navigationdrawer import MDNavigationDrawer, NavigationDrawerIconButton, NavigationLayout

from kivy.properties import ObjectProperty

from kivymd.toast import toast

kivy.require('1.11.0')

class LayoutPy(FloatLayout):

def __init__(self, **kwargs):

super(LayoutPy, self).__init__(**kwargs)

self.scr_mngr = ObjectProperty(None)

self.build_nav_btns()

def callback(self, instance, value):

toast("Pressed item menu %d" % value)

def exit(self):

sys.exit(1)

def build_nav_btns(self):

btns = ["Select Language", "Contact the developer", "Exit"]

for count, btn in enumerate(btns):

if count == 1:

self.ids.nav_drawer.add_widget(

NavigationDrawerIconButton(

icon='settings', text=btn,

on_release=lambda x, btn: self.callback(x, btn)))

elif count == 2:

self.ids.nav_drawer.add_widget(

NavigationDrawerIconButton(

icon='face', text=btn,

on_release=lambda x, btn: self.callback(x, btn)))

elif count == 3:

self.ids.nav_drawer.add_widget(

NavigationDrawerIconButton(

icon='close', text=btn,

on_release=lambda x: self.exit()))

Builder.load_file("design.kv")

class KivyGUI(App):

theme_cls = ThemeManager()

theme_cls.primary_palette = ("Teal")

title = ("App")

def build(self):

c = LayoutPy()

return c

if __name__ == "__main__":

KivyGUI().run()

我對Python代碼進行了大量的裁剪，這樣對您來說就更清楚了。我不認為這是模塊本身的問題，因為KivyMD example code對我來說很好(這也是我運行它時解決方案的外觀)。我認為問題是我的LayoutPy類繼承了FloatLayout，它沒有{}對象。。。但是我現在不知道如何在我現有的代碼中實現一個合適的解決方案(我現在正在嘗試兩天)。如果您需要整個代碼(在添加NavigationDrawer之前，一切都很好)，您可以看看here。在

先謝謝你！在

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