BoxLayout內的Kivy嵌套ScreenManager

每周都會看到不同風味的東西，在這里我們再次使用更多 ScreenManager 惡作劇！

除非按鈕是螢屏本身的一部分，否則螢屏不會改變，我希望在頂部有一個通用導航欄，然后在其下方有一個“顯示”。兩個螢屏都作業，在它們之間切換的按鈕不作業。

（如果你能告訴我如何使每個螢屏都有自己的 KV 檔案并仍然與螢屏管理器鏈接，則可以加分）

無論如何：代碼

QCManager.py

import kivy
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen, NoTransition

kivy.require('1.9.1')


class MOTD(Screen):
    print("MOTD Screen!")
    pass


class Search(Screen):
    print("Search Screen!")
    pass


class ScreenManagement(ScreenManager):
    pass


class ClassAllScreen(BoxLayout):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.manager = ScreenManagement()


class ClassApp(App):

    def build(self):
        self.root = ClassAllScreen()
        return self.root

if __name__ == '__main__':
    Builder.load_file('./kvfiles/main.kv')
    ClassApp().run()

主檔案

#: import NoTransition kivy.uix.screenmanager.NoTransition
<MOTD>:
    name: 'motd'
    BoxLayout:
        orientation:'vertical'
        padding:20
        spacing:10
        Label:
            text:"The Cake Is a Lie"

<Search>:
    name: 'search'
    BoxLayout:
        orientation:'vertical'
        padding:20
        spacing:10
        GridLayout:
            spacing:10
            cols:2

            Button:
                text:'Left'
            Button:
                text:'Right'
        Button:
            text:'bottom'


<ScreenManagement>:
    transition: NoTransition()
    MOTD:
    Search:

<ClassAllScreen>:
    orientation:'vertical'
    BoxLayout:
        size_hint_y: None
        height: 60
        spacing: 5
        padding: 5

        canvas:
            Color:
                rgba: .1,.1,.1,1
            Rectangle:
                pos: self.pos
                size: self.size
        Button:
            text:'Menu'
            size_hint_x: None
            width: 120
            on_release: root.manager.current = 'motd'
        Button:
            text:'Search'
            size_hint_x: None
            width: 120
            on_release: root.manager.current = 'search'
        Button:
            text:'Add to DB'
            size_hint_x: None
            width: 120
            on_press: print("Button Working")
    ScreenManagement:

uj5u.com熱心網友回復：

您__init__()在ClassAllScreen類中的方法正在創建ScreenManagement. 該實體保存為self.manager，但不會添加到您的 GUI。

在您的kv檔案中，該行：

ScreenManagement:

正在創建另一個不同的ScreenManagement. 此實體ScreenManagement是您的 GUI 中的實體。

因此，您self.manager在其中所做的任何事情ClassAllScreen都不會影響ScreenManagement您的 GUI 中的內容。

解決方法是確保您參考的是正確的實體ScreenManagement（而不是費心創建任何其他實體）。為此，您可以在檔案中添加一個ObjectPropertyto ，如下所示：ClassAllScreenkv

<ClassAllScreen>:
    manager: scr_manager  # added ObjectProperty that references the scr_manager id
    orientation:'vertical'
    BoxLayout:
        size_hint_y: None
        height: 60
        spacing: 5
        padding: 5

        canvas:
            Color:
                rgba: .1,.1,.1,1
            Rectangle:
                pos: self.pos
                size: self.size
        Button:
            text:'Menu'
            size_hint_x: None
            width: 120
            on_release: root.manager.current = 'motd'
        Button:
            text:'Search'
            size_hint_x: None
            width: 120
            on_release: root.manager.current = 'search'
        Button:
            text:'Add to DB'
            size_hint_x: None
            width: 120
            on_press: print("Button Working")
    ScreenManagement:
        id: scr_manager  # new id to enable reference to this ScreenManagement instance

ClassAllScreen然后可以將類簡化為：

class ClassAllScreen(BoxLayout):
    pass

uj5u.com熱心網友回復：

只是為了幫助任何試圖做同樣的事情的人。固定代碼如下

應用程式.py

import kivy
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen, NoTransition

kivy.require('1.9.1')


class MOTD(Screen):
    print("MOTD Screen!")
    pass


class Search(Screen):
    print("Search Screen!")
    pass


# class ScreenManagement(ScreenManager):
    # pass  # Removed, Instanced in kv


class ClassAllScreen(BoxLayout):
    pass  # Removed code, Done in kv


class ClassApp(App):
    def build(self):
        self.root = ClassAllScreen()
        return self.root

if __name__ == '__main__':
    Builder.load_file('./kvfiles/main.kv')
    ClassApp().run()

主檔案

#: import NoTransition kivy.uix.screenmanager.NoTransition
<MOTD>:
    name: 'motd'
    BoxLayout:
        orientation:'vertical'
        padding:20
        spacing:10
        Label:
            text:"The Cake Is a Lie"

<Search>:
    name: 'search'
    BoxLayout:
        orientation:'vertical'
        padding:20
        spacing:10
        GridLayout:
            spacing:10
            cols:2

            Button:
                text:'Left'
            Button:
                text:'Right'
        Button:
            text:'bottom'


<ClassAllScreen>:
    manager:scr_manager
    orientation:'vertical'
    BoxLayout:
        size_hint_y: None
        height: 60
        spacing: 5
        padding: 5

        canvas:
            Color:
                rgba: .1,.1,.1,1
            Rectangle:
                pos: self.pos
                size: self.size
        Button:
            text:'Menu'
            size_hint_x: None
            width: 120
            on_release: root.manager.current = 'motd'
        Button:
            text:'Search'
            size_hint_x: None
            width: 120
            on_release: root.manager.current = 'search'
        Button:
            text:'Add to DB'
            size_hint_x: None
            width: 120
            on_press: print("Button Working")
    ScreenManager:
        transition: NoTransition()
        id: scr_manager
        MOTD:
        Search:

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