如何从另一个类更改类的属性

Question

我是 Kivy 的新手，遇到了问题。我有“MainPanel”类，它包含四个类“导航”、“图像”、“配置”和“信息”。我想要的是当在“导航”类中按下按钮时，然后在“信息”类中使用屏幕管理器更改当前屏幕。这是我的代码：Main.py：class Navigation(FloatLayout):    passclass Information(ScreenManager):    passclass SlothFacts(Screen):    passclass KiwiFacts(Screen):    passclass MainPanel(GridLayout):    passBuilder.load_file("mainPanel.kv")class Complex(App):    def build(self):        return MainPanel()if __name__ == "__main__":    Complex().run()主面板.kv：#:include navigation.kv#:include images.kv#:include config.kv#:include information.kv<MainPanel>:    cols:2    Navigation:    Images:    Config:    Information:导航.kv：<Navigation>:    Button:        text:"Kiwi"        size_hint:(.3, .2)        pos_hint:{'x':.1, 'y':.25}        #on_press: <--- Change screen to kiwi in Information class资料.kv：#: import  FadeTransition kivy.uix.screenmanager.FadeTransition<Information>    transition: FadeTransition()    SlothFacts:    KiwiFacts:<SlothFacts>:    name: "sloth"    Label:        text:"im sloth"<KiwiFacts>:    name: "kiwi"    Label:        text:"im kiwi"

Answer 1

在文件中添加一个id，例如：ScreenManagermainPanel.kv

#:include navigation.kv

#:include images.kv

#:include config.kv

#:include information.kv

<MainPanel>:

    cols:2

    Navigation:

    Images:

    Config:

    Information:

        id: screenManager

然后，在您的Navigation.kv文件中使用它：

<Navigation>:

    Button:

        text:"Kiwi"

        size_hint:(.3, .2)

        pos_hint:{'x':.1, 'y':.25}

        #on_press: <--- Change screen to kiwi in Information class

        on_press: app.root.ids.screenManager.current='kiwi'