属性错误：当我运行我的 kivy 代码时'kivy.graphics.context_instructions.Color'对象没有属性'fbind'

Question

以下代码有什么问题？

# Program to Show how to create a switch
# import kivy module
import kivy
# base Class of your App inherits from the App class.
# app:always refers to the instance of your application
from kivy.app import App
# this restrict the kivy version i.e
# below this kivy version you cannot
# use the app or software
kivy.require('1.9.0')
# Builder is used when .kv file is
# to be used in .py file
from kivy.lang import Builder
# The screen manager is a widget
# dedicated to managing multiple screens for your application.
from kivy.uix.screenmanager import ScreenManager, Screen
# You can create your kv code in the Python file
Builder.load_string(""" 
<ScreenOne>: 
BoxLayout: 
canvas.before:
Color:
rgba: (.4, .6, 9, 1)                          #(0,0,0,1)
Rectangle:
size: self.size
pos: self.pos
canvas:
Color:
rgba: (1, 1, 1,1)
RoundedRectangle:
size : self.width/2, self.height/3
pos : self.center_x - self.w
idth/4 , self.center_y - self.height/6                         
radius: [(40, 40), (40, 40), (40, 40), (40, 40)]

Button: 
text: "Go to Screen 2" 
background_color : 0, 0, 1, 1 
on_press: 
# You can define the duration of the change 
# and the direction of the slide 
root.manager.transition.direction = 'left' 
root.manager.transition.duration = 1 
root.manager.current = 'screen_two' 
<ScreenTwo>: 
BoxLayout: 
Button: 
text: "Go to Screen 3" 
background_color : 1, 1, 0, 1 
on_press: 
root.manager.transition.direction = 'left' 
root.manager.transition.duration = 1 
root.manager.current = 'screen_three' 
<ScreenThree>: 
BoxLayout: 
Button: 
text: "Go to Screen 4" 
background_color : 1, 0, 1, 1 
on_press: 
root.manager.transition.direction = 'left' 
root.manager.transition.duration = 1 
root.manager.current = 'screen_four' 
<ScreenFour>: 
BoxLayout: 
Button: 
text: "Go to Screen 5" 
background_color : 0, 1, 1, 1 
on_press: 
root.manager.transition.direction = 'left' 
root.manager.transition.duration = 1 
root.manager.current = 'screen_five' 
<ScreenFive>: 
BoxLayout: 
Button: 
text: "Go to Screen 1" 
background_color : 1, 0, 0, 1 
on_press: 
root.manager.transition.direction = 'right' 
root.manager.current = 'screen_one' 

""")

# Create a class for all screens in which you can include
# helpful methods specific to that screen
class ScreenOne(Screen):
pass

class ScreenTwo(Screen):
pass

class ScreenThree(Screen):
pass

class ScreenFour(Screen):
pass

class ScreenFive(Screen):
pass

# The ScreenManager controls moving between screens
screen_manager = ScreenManager()
# Add the screens to the manager and then supply a name
# that is used to switch screens
screen_manager.add_widget(ScreenOne(name="screen_one"))
screen_manager.add_widget(ScreenTwo(name="screen_two"))
screen_manager.add_widget(ScreenThree(name="screen_three"))
screen_manager.add_widget(ScreenFour(name="screen_four"))
screen_manager.add_widget(ScreenFive(name="screen_five"))

# Create the App class
class ScreenApp(App):
def build(self):
return screen_manager
# run the app

sample_app = ScreenApp()
sample_app.run()

我是kivy的新手，在网上得到了这个代码，它非常完美。我现在试图通过在里面放一些画布和形状来改变它，但我得到了错误：

AttributeError: 'kivy.graphics.context_instructions.Color' object has no attribute 'fbind'

这意味着什么？我如何再次改变这一点，以实现我的目标，将我的两个矩形放在适当的位置并在它们上按下按钮？

Answer 1

假设您正确地复制和粘贴了代码，则缩进是错误的，您已经在子窗口小部件级别放置了Color指令，而不是在canvas.before:下缩进。这很可能是导致您出错的原因。