Question

请帮我看一下这段代码。每次我运行它，它显示一个空白屏幕，是kivy的新手。

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


class first_screen(Screen):
    pass

class second_screen(Screen):
    pass 

class my_manager(ScreenManager):
    pass 


Builder.load_file("testing_screens.kv")

class testing_screens(App):
    def build(self):
        return my_manager()



testing_screens().run()


<my_manager>:
    first_screen:
    second_screen:

<first_screen>:
    name: "one"
    Button:
        text: "hello peeps"
        on_press: app.root.current= "two"

<second_screen>:
    name: "two"
    Button:
        text: "world gurus"
        on_press: app.root.current= "one"

代码搞砸了。

Answer 1

小部件名称必须以大写字母开头才能使kv正常工作，因为它使用它来区分它们与属性。在这种情况下，kv规则认为你创建了两个名为first_screen和second_screen的新属性，而不是你添加了两个小部件。

在屏幕经理kivy的黑屏

1 个答案: