应用程序名称在kivy中

Question

我有两个带有一个kv文件的应用程序。两个应用程序之间仅在app类名称中有所不同。应用A给出了良好的结果，但应用B是坏的。哪里有问题？

申请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()

申请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档案：

<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. 一个类规则，由＆lt;之间的widget类的名称声明。 ＆GT;然后是：例如＆LT; MYW＆GT;：
2. 缩进是4个空格

实施例

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()

ControlShowApp.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