初始化Kivy屏幕的正确方法是什么? [英] What is the correct way to initialize a Kivy Screen?

问题描述

我正在将Kivy与.kv文件一起使用.这就是我的Python代码:

I am using Kivy with a .kv file. This is what my Python code looks like:

class WelconeScreen(Screen):
    def __init__(self, **kwargs):
        self.name='home'
        super(Screen,self).__init__(**kwargs)

class QuestionScreen(Screen):
    def __init__(self, **kwargs):
        self.name='question'
        super(Screen,self).__init__(**kwargs)

class RootScreen(ScreenManager):
    pass

class TestApp(App):
   def build(self):
        return RootScreen()

if __name__ == '__main__':
    appVar = TestApp()
    TestApp().run()

这是我的.kv文件:

<RootScreen>:
    WelcomeScreen:
    QuestionScreen:

<WelcomeScreen>:
    Button:
        text: 'Download DB'
<QuestionScreen>:
    BoxLayout:
        Button:
            text: 'My settings button'
        Button:
            text: 'Back to menu'
            on_press: root.manager.current = 'home'

这是用Kivy初始化屏幕的正确方法吗?这行得通，但是我不确定构造函数是否是正确的方法.

Is this the correct way to initialize a Screen with Kivy? This works, but I am not sure the constructor is the right way to do it.

推荐答案

name是kivy属性，因此您可能希望在调用super之后而不是之前对其进行初始化.

name is a kivy property, so you probably want to intialise it after calling super, not before.

您也可以在kv中进行设置，而不必为此专门定义__init__:

You can also set it in kv instead, then you don't have to define an __init__ just for this:

<WelcomeScreen>:
    name: 'home'
    Button:
        text: 'Download DB'

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