在 kivymd 中更改屏幕时更改工具栏标题

如何解决在 kivymd 中更改屏幕时更改工具栏标题

我的程序包含两个屏幕。我希望每次更改屏幕时更改工具栏标题。

这是我的 main.py 文件

from kivymd.app import MDApp
from kivy.lang import Builder
from kivymd.uix.Boxlayout import MDBoxLayout
from kivy.properties import ObjectProperty,StringProperty
from kivymd.uix.navigationdrawer import MDNavigationDrawer
from kivymd.uix.navigationdrawer import MDNavigationLayout
from kivy.uix.screenmanager import Screen
from kivy.core.window import Window
from kivy.uix.screenmanager import ScreenManager
from kivymd.uix.toolbar import MDToolbar

Window.size = (360,640)

global sm

class DashboardScreen(Screen):
    def __init__(self,**kwargs):
        super(DashboardScreen,self).__init__(**kwargs)


class DigitalGoldScreen(Screen):
    def __init__(self,**kwargs):
        super(DigitalGoldScreen,self).__init__(**kwargs)


class ContentNavigationDrawer(MDBoxLayout):
    screen_manager = Objectproperty()
    nav_drawer = Objectproperty()


# Create the screen manager

sm = ScreenManager()
sm.add_widget(DashboardScreen(name='screen-dash'))
sm.add_widget(DigitalGoldScreen(name='screen-dgld'))



class MoneyManagercopiedApp(MDApp):
    def __init__(self,**kwargs):
        super(MoneyManagercopiedApp,self).__init__(**kwargs)



    def set_toolbartitle(self,screen):
        self.title = screen
        return self.title

    def get_toolbartitle(self):


        screentitle = self.title
        if screentitle == "screen-dash":
            self.settitle = "Dashboard"
        elif screentitle == "screen-dgld":
            self.settitle = "Digital Gold"
        else:
            pass

        return (self.settitle)


    def build(self):
        pass

print(sm.current)
if __name__ == "__main__":
    MoneyManagercopiedApp().run()

这是我的 .kv 文件

<ContentNavigationDrawer>:

    ScrollView:

        MDList:

            OneLineListItem:
                text: "Digital Gold"
                on_press:
                    root.nav_drawer.set_state("close")
                    root.screen_manager.current = "screen-dgld"



            OneLineListItem:
                text: "Dashboard"
                on_press:
                    root.nav_drawer.set_state("close")
                    root.screen_manager.current = "screen-dash"

mdscreen:

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


    MDNavigationLayout:
        ScreenManager:
            id: screen_manager

            DashboardScreen:
            DigitalGoldScreen:


        MDNavigationDrawer:
            id: nav_drawer

            ContentNavigationDrawer:
                screen_manager: screen_manager
                nav_drawer: nav_drawer



<DashboardScreen>:
    name: 'screen-dash'


    MDRectangleFlatButton:
        text: "You're in dashboard screen"
        pos_hint: {'center_x':0.5,'center_y':0.6}
        on_press: root.manager.current = 'screen-dgld'


<DigitalGoldScreen>:
    name: 'screen-dgld'
    MDLabel:
        text: "You're in digigold screen"
        halign: 'center'
    MDRectangleFlatButton:
        text: 'Back'
        pos_hint: {'center_x':0.5,'center_y':0.1}
        on_press: root.manager.current = 'screen-dash'

我在某处找到了与绑定回调函数相关的内容，但我不明白。如何创建这样的函数并将其放置在 .kv 文件中 MDToolbar 的工具栏属性中？

解决方法

您可以在您的 on_press 中包含更改 Button 的 Screen。像这样：

<DashboardScreen>:
    name: 'screen-dash'


    MDRectangleFlatButton:
        text: "You're in dashboard screen"
        pos_hint: {'center_x':0.5,'center_y':0.6}
        on_press:
            root.manager.current = 'screen-dgld'
            app.root.ids.toolbar.title = 'Digital Gold'


<DigitalGoldScreen>:
    name: 'screen-dgld'
    MDLabel:
        text: "You're in digigold screen"
        halign: 'center'
    MDRectangleFlatButton:
        text: 'Back'
        pos_hint: {'center_x':0.5,'center_y':0.1}
        on_press:
            root.manager.current = 'screen-dash'
            app.root.ids.toolbar.title = 'Dashboard'