AttributeError: 'kivy.graphics.context_instruc

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' 

我是 kivy 的新手，在网上获得了这段代码，效果很好。我现在试图通过在其中放置一些画布和形状来更改它，但出现错误：

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

这是什么意思，我怎样才能再次改变它以实现我的目标，即放置我的 2 个矩形并在它们上面放置按钮？

Answer 1

假设您正确复制并粘贴了代码，但缩进是错误的，您已将 Color 指令放在子小部件级别，而不是缩进到canvas.before:.&nbsp;这很可能导致您的错误。