Kivy错误:没有名称的屏幕 [英] Kivy Error: No Screen with Name

问题描述

我在Kivy ScreenManager中设置了一个Screen(myScreen只是一个继承Screen的类)

I set up a Screen in a Kivy ScreenManager (myScreen is just a class that inherits Screen)

class firstScreen(myScreen):
    def __init__(self,**kwargs):
        super(firstScreen, self).__init__(**kwargs)
        self.name = "first"
        self.add_widget(Button(on_release = switchScreens("second")))

我还设置了第二个屏幕:

I also set up a second screen:

class secondScreen(myScreen):
    def __init__(self,**kwargs):
        super(secondScreen, self).__init__(**kwargs)
        self.name = "second"

然后我设置我的ScreenManager:

I then set up my ScreenManager:

sm = ScreenManager()
sm.add_widget(firstScreen())
sm.add_widget(secondScreen())

这是switchScreens的代码:

And here is the code for switchScreens:

def switchScreens(next):
    sm.current = next

运行sm时，出现以下错误:

When I run sm, I get the following error:

kivy.uix.screenmanager.ScreenManagerException:没有名称为"second"的屏幕.

kivy.uix.screenmanager.ScreenManagerException: No Screen with name "second".

这对我来说似乎是错误的，因为我将secondScreen()添加到了sm中，名称为"second".

This seems wrong to me, since I added the secondScreen() to sm, with a name of "second".

如何获取firstScreen上的按钮以将应用正确发送到secondScreen?

How can I get the Button on firstScreen to correctly send the app to secondScreen?

推荐答案

在此处定义名称，而不是屏幕类:

Define the names inside here, not the screen classes:

sm = ScreenManager()
sm.add_widget(firstScreen())
sm.add_widget(secondScreen())

上方应为:

sm = ScreenManager()
sm.add_widget(firstScreen(name="first"))
sm.add_widget(secondScreen(name="second"))

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