Kivy：self.parent.current 没有使用屏幕管理器将我重定向到不同的屏幕

Question

使用 Kivymd，我试图让 MDList 中的按钮转到某个页面，但是当我尝试设置 on_release 时，没有任何反应。有人请帮忙。我需要能够单击注销按钮并使用 python 函数将我重定向到登录屏幕，因为我还想在单击按钮后做其他事情

main.py

import kivy
from kivy.uix.widget import Widget
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.behaviors.button import ButtonBehavior
from kivymd.app import MDApp
from kivymd.theming import ThemeManager

class SignInScreen(Screen):
    pass

class HomeScreen(Screen):
    pass

class MenuScreen(Screen):
    pass

class ButtonGrid(ButtonBehavior, BoxLayout):
    pass

class AttendanceApp(MDApp):
    def build(self):
        #self.theme_cls.primary_palette = "LightBlue"
        #self.theme_cls.accent_palette = "Red"
        return HomeScreen()
    def change_theme(self, primary_palette, accent_palette):
        pass
        #theme_cls = ThemeManager()
    def signin_pressed(self, instance):
        pass

if __name__ == "__main__":
    AttendanceApp().run()

Attendance.kv

# Filename: Attendance.kv

#:import utils kivy.utils

#screens

<SignInScreen>
 #code

<HomeScreen>
    NavigationLayout:

        ScreenManager:

            Screen:

                BoxLayout:
                    orientation: "vertical"

                    MDToolbar:
                        title: "Home"
                        left_action_items: [["menu", lambda x: nav_menu.set_state()]]
                        elevation: 10

                    MDLabel:
                        text: "Content"
                        halign: "center"
                        
        MDNavigationDrawer:
            id: nav_menu

            MenuScreen:

ScreenManager:
    id: sm_menu

    SignInScreen:
        name: "signin"
    HomeScreen:
        name: "home"
    MenuScreen:
        name: "menu"

<MenuScreen>
        
    ScrollView:

        MDList:
            id: scroll

            OneLineAvatarIconListItem:
                id: menu_home
                text: "Home"
                elevation: 10

                IconLeftWidget:
                    icon: "home"
            
            OneLineAvatarIconListItem:
                id: menu_schedule
                text: "Schedule"
                elevation: 10

                IconLeftWidget:
                    icon: "calendar-month"
            
            OneLineAvatarIconListItem:
                id: menu_take
                text: "Take"
                elevation: 10

                IconLeftWidget:
                    icon: "account-multiple"

            OneLineAvatarIconListItem:
                id: menu_rosters
                text: "Rosters"
                elevation: 10

                IconLeftWidget:
                    icon: "clipboard-list-outline"

            OneLineAvatarIconListItem:
                id: menu_subs
                text: "Subs"
                elevation: 10

                IconLeftWidget:
                    icon: "account-multiple-outline"
            
            OneLineAvatarIconListItem:
                id: menu_help
                text: "Help"
                elevation: 10

                IconLeftWidget:
                    icon: "lightbulb-on-outline"

            OneLineAvatarIconListItem:
                id: menu_settings
                text: "Settings"
                elevation: 10

                IconLeftWidget:
                    icon: "settings-outline"        

            OneLineAvatarIconListItem:
                id: menu_signout
                text: "Sign Out"
                elevation: 10
                on_release: "signin"

                IconLeftWidget:
                    icon: "exit-to-app"

Answer 1

您可以像这样 Button 稍微更改 kv：

        OneLineAvatarIconListItem:
            id: menu_signout
            text: "Sign Out"
            elevation: 10
            on_release: app.signout_pressed()

            IconLeftWidget:
                icon: "exit-to-app"

然后在您的 AttendanceApp 中添加一个方法：

def signout_pressed(self):
    print('signout pressed')
    self.root.current = 'signin'

这假设您的 AttendanceApp 的 root 将是 ScreenManager。

Kivy：self.parent.current 没有使用屏幕管理器将我重定向到不同的屏幕

Kivy: self.parent.current not redirecting me to different screen using screen manager

python

kivy

kivy-language

kivymd