Python kivy 应用程序，每个屏幕都有 kv 和 py 文件

Question

请解释我如何在 kivy 上创建一个应用程序，以便每个屏幕都有单独的 py 和 kv 文件。包括从屏幕调用的屏幕。事实上，我们需要一个表单的示例应用程序： 主屏-> 1屏-> 2屏

Answer 1

这是一种方法：

main.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()

main.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:

screen1.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'

screen2.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'

当然，有不同的方法可以做到这一点。另一种方法是在main.py 中导入所有py 文件，然后在main.py 中为每个kv 文件使用Builder.load_file()

如果您将所有文件（main.py 除外）放在名为subs 的子文件夹中，则只需对 main.py 进行更改：

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

并更改为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: