Question

我正在尝试使用CardTransition在多个屏幕上创建一个简单的应用程序，但是当我尝试运行它时，我得到一个错误。我知道应用程序本身有效，因为我尝试了不同的过渡，它工作正常。我正在使用Python 3.4.4和Kivy 1.9.1。

以下是代码：

import kivy
kivy.require("1.9.1")

from kivy.uix.boxlayout     import BoxLayout
from kivy.app               import App
from kivy.uix.label         import Label
from kivy.uix.button        import Button
from kivy.lang              import Builder
from kivy.uix.screenmanager import ScreenManager, Screen, SwapTransition, CardTransition

KivyFile = Builder.load_string("""
<Screen1>:
    name: "Screen1"
    BoxLayout:
        orientation: "vertical"
        padding: 40
        spacing: 20

        Label:
            text: "This is screen 1"
        Button:
            text: "Next Screen"
            on_release: app.root.current = "Screen2"
<Screen2>:
    name: "Screen2"
    BoxLayout:
        orientation: "vertical"
        padding: 40
        spacing: 20

        Label:
            text: "This is screen 2"
        Button:
            text: "Next Screen"
            on_release: app.root.current = "Screen3"
<Screen3>:
    name: "Screen3"
    BoxLayout:
        orientation: "vertical"
        padding: 40
        spacing: 20

        Label:
            text: "This is screen 3"
        Button:
            text: "Next Screen"
            on_release: app.root.current = "Screen1"
""")

class Screen1(Screen):
    pass

class Screen2(Screen):
    pass

class Screen3(Screen):
    pass

sm = ScreenManager(transition=CardTransition())
sm.add_widget(Screen1(name = "Screen1"))
sm.add_widget(Screen2(name = "Screen2"))
sm.add_widget(Screen3(name = "Screen3"))

class MyApp(App):

    def build(self):
        return sm

if __name__ == "__main__":
    MyApp().run()

这是我得到的错误：

 Traceback (most recent call last):
   File "C:/Users/Markus/Desktop/Kivy/TestTransitions.py", line 9, in <module>
     from kivy.uix.screenmanager import ScreenManager, Screen, SwapTransition, CardTransition
 ImportError: cannot import name 'CardTransition'

Answer 1

CardTransition只在kivy 1.10中添加。

CardTransition在Kivy 1.9.1中不起作用

1 个答案: