Question

我有一个python文件，应该在 Builder.load_string 中引用多个类 firstscreenScreen和secondscreenScreen。但是，它执行的操作却显示错误unknow类secondscreenScreen。我猜这是因为它仅搜索头等舱，而忽略其他舱位。我在这里删除了无关紧要的代码。如何在一个buildloader中包含两个或多个文件，是否可以选择包含2 buil.load_string并且仍然能够切换屏幕？

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.core.window import Window
from kivy.lang import Builder
from kivy.uix.button import Button



Builder.load_string("""
#:kivy 1.9.0

<firstscreenScreen>:
   Word:

<secondscreenScreen>:
    WordList:
        Label:
            id: label1
            text: self.parent.txt1

""")



class Word(Widget):
    pass


class firstscreenScreen(Screen):

    pass


class secondscreenScreen(Screen):
    pass


class ScreenManager(ScreenManager):
    pass


   sm = ScreenManager()
   sm.add_widget(firstscreenScreen(name='firstscreen'))
   sm.add_widget(secondscreenScreen(name='secondscreen'))


class WordApp(App):

    def build(self):
        Window.clearcolor = (0,0,0.3,1)
        return sm


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



class WordList(Widget):
    txt1 = "abc"
class firstscreenScreen(Screen):
    pass


class secondscreenScreen(Screen):
     pass

class WordListApp(App):

    def build(self):
        Window.clearcolor = (0,0,0.3,1)
        return sm


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

Answer 1

在定义它们之前，您尝试使用这些类。将类定义移至load_string命令之前。

在一个build.load_string中引用多个python类

1 个答案: