Python kivy 應用程序，每個屏幕都有 kv 和 py 文件

Question

請解釋我如何在 kivy 上創建應用程序，以便每個屏幕都有單獨的 py 和 kv 文件。 包括從屏幕調用的屏幕。 其實我們需要一個窗體的示例應用：Mainscreen-> 1screen-> 2screen

Answer 1

這是一種方法：

主要.py：

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager


class WindowManager(ScreenManager):
    pass

class TestApp(App):
    def build(self):
        return Builder.load_file('main.kv')  # this method can be eliminated if `main.kv` is renamed to `test.kv`

if __name__ == '__main__':
    TestApp().run()

主.kv：

#  import the python files defining the Screens
#: import Screen1 screen1.Screen1
#: import Screen2 screen2.Screen2

#  include the kv files for the other Screens
#: include screen1.kv
#: include screen2.kv

WindowManager:
    Screen1:
    Screen2:

屏幕1.py：

from kivy.uix.screenmanager import Screen


class Screen1(Screen):
    pass

screen1.kv:

<Screen1>:
    name: 'screen1'
    BoxLayout:
        Label:
            text: 'Screen1'
        Button:
            text: 'back'
            on_release: app.root.current = 'screen2'

屏幕2.py：

from kivy.uix.screenmanager import Screen


class Screen2(Screen):
    pass

screen2.kv:

<Screen2>:
    name: 'screen2'
    BoxLayout:
        Label:
            text: 'Screen2'
        Button:
            text: 'back'
            on_release: app.root.current = 'screen1'

當然，有不同的方法可以做到這一點。 另一種方法是導入main.py中的所有py文件，並在main.py中為每個kv文件使用Builder.load_file()

如果您將所有文件（除了 main.py）放在名為subs的子文件夾中，那么您只需對 main.py 進行更改：

class TestApp(App):
    def build(self):
        return Builder.load_file('subs/main.kv')

並更改main.kv ：

#  import the python files defining the Screens
#: import Screen1 subs.screen1.Screen1
#: import Screen2 subs.screen2.Screen2

#  include the kv files for the other Screens
#: include subs/screen1.kv
#: include subs/screen2.kv

WindowManager:
    Screen1:
    Screen2: