如何在KivyMD（Python）中组合导航抽屉和多个屏幕？

Question

我是一个编码初学者，我想制作一个移动应用程序，其中包含一个带有导航抽屉的工具栏，应该可以将用户带到应用程序中的不同屏幕。我到处寻找解决方案，但没有真正找到，因为有时整个代码都在.kv文件中，因此很难处理变量并打印它们，例如在以下代码中：

How to switch between screens within the NavigationDrawer using KivyMD

我尝试将其与只使用Kivy而不是KivyMD的代码结合起来，但我失败了，因为它实际上不适用于移动应用程序：

https://www.techwithtim.net/tutorials/kivy-tutorial/multiple-screens/

我希望有人能帮助我。 谢谢

Answer 1

from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty

from kivymd.app import MDApp

KV = '''
<ContentNavigationDrawer>:

    ScrollView:

        MDList:

            OneLineListItem:
                text: "Screen 1"
                on_press:
                    root.nav_drawer.set_state("close")
                    root.screen_manager.current = "scr 1"

            OneLineListItem:
                text: "Screen 2"
                on_press:
                    root.nav_drawer.set_state("close")
                    root.screen_manager.current = "scr 2"


Screen:

    MDToolbar:
        id: toolbar
        pos_hint: {"top": 1}
        elevation: 10
        title: "MDNavigationDrawer"
        left_action_items: [["menu", lambda x: nav_drawer.set_state("open")]]

    MDNavigationLayout:
        x: toolbar.height

        ScreenManager:
            id: screen_manager

            Screen:
                name: "scr 1"

                MDLabel:
                    text: "Screen 1"
                    halign: "center"

            Screen:
                name: "scr 2"

                MDLabel:
                    text: "Screen 2"
                    halign: "center"

        MDNavigationDrawer:
            id: nav_drawer

            ContentNavigationDrawer:
                screen_manager: screen_manager
                nav_drawer: nav_drawer
'''


class ContentNavigationDrawer(BoxLayout):
    screen_manager = ObjectProperty()
    nav_drawer = ObjectProperty()


class TestNavigationDrawer(MDApp):
    def build(self):
        return Builder.load_string(KV)


TestNavigationDrawer().run()

https://kivymd.readthedocs.io/en/latest/components/navigation-drawer/#switching-screens-in-the-screenmanager-and-using-the-common-mdtoolbar