kivy中的应用程序名称

Question

我有两个应用程序和一个 kv 文件。两个应用程序之间仅在应用程序 class 名称中有所不同。应用程序 A 的结果很好，但应用程序 B 的结果很差。问题出在哪里？

应用程序 A：

import kivy
kivy.require('1.0.5')
from kivy.lang.builder import Builder

from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout
from kivy.app import App

class MyW(GridLayout):
    pass

class ShowApp(App):
def build(self):
    Builder.load_file('d:\MyPgm\Python\kivy\ControlShow    \ControlShow.kv')
    return MyW()


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

应用程序 B：

import kivy
kivy.require('1.0.5')
from kivy.lang.builder import Builder

from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout
from kivy.app import App

class MyW(GridLayout):
    pass

class ControlShowApp(App):
def build(self):
    Builder.load_file('d:\MyPgm\Python\kivy\ControlShow    \ControlShow.kv')
    return MyW()


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

KV 文件：

<MyW>
    cols: 2
    rows: 2
    Button:
      id: label1
      text: 'B1'
    Button:
      id: label2
      text: 'B2'
    Button:
      id: label3
      text: 'B3'
    Button:
      id: label4
      text: 'B4'

Answer 1

问题如下：

1. 一个 class 规则，由 < > 之间的小部件 class 的名称声明，后跟：例如<我的W>:
2. 缩进4个空格

例子

ControlShow.kv

#:kivy 1.10.0

<MyW>:
    cols: 2
    rows: 2
    Button:
        id: label1
        text: 'B1'
    Button:
        id: label2
        text: 'B2'
    Button:
        id: label3
        text: 'B3'
    Button:
        id: label4
        text: 'B4'

ShowApp.py

from kivy.lang.builder import Builder
from kivy.uix.gridlayout import GridLayout
from kivy.app import App


class MyW(GridLayout):
    pass


class ShowApp(App):
    def build(self):
        Builder.load_file('d:\MyPgm\Python\kivy\ControlShow    \ControlShow.kv')
        return MyW()


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

控制ShowApp.py

from kivy.lang.builder import Builder
from kivy.uix.gridlayout import GridLayout
from kivy.app import App


class MyW(GridLayout):
    pass


class ControlShowApp(App):
    def build(self):
        Builder.load_file('d:\MyPgm\Python\kivy\ControlShow    \ControlShow.kv')
        return MyW()


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

输出