问题描述
众所周知，这个问题已经被问过好几次了.但是尝试以下解决方案后:
As I am very well aware, this question has been asked several times already. But after trying the following solutions:
- Python-Kivy:AttributeError:'super'尝试获取self.ids时，对象没有属性'__getattr__'
- Python/Kivy AttributeError:超级"对象没有属性'__getattr__'
- 如何我能否在不获取AttributeError的情况下访问kivy中另一个类的对象属性:'super'对象没有属性'__getattr__'
- AttributeError:超级"对象没有属性"__getattr __"
我得出的结论是，在我的特定问题上我需要帮助.列出的解决方案似乎不适用于我的具体情况.
I have reached the conclusion that i need help in my specific problem. The solutions listed didn't seem to work in my specific case.
以下情况:
我目前正在尝试使用kivy为智能手机开发应用程序.由于我喜欢干净整洁的结构代码，因此将Kivy代码拆分为几个kv文件.python代码应该主要具有逻辑，仅此而已.为了使其正常工作，我需要在不同的kv文件中引用不同对象的实例.为了弄清楚我的问题，我构建了一个相当简单的示例:
I am currently trying to develop an application for smartphones using kivy. Since i like my code pretty clean and clear structured i have split my Kivy code into several kv-files. The python code is supposed to have primarily the logic and nothing more. In order to get it working properly i need to reference the instances of the different objects in the different kv-files. In order to make my problem clear i have constructed a fairly simple example:
文件:try.py
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.factory import Factory
from kivy.uix.label import Label
from kivy.lang import Builder
x= 1
class ComplexBox(Widget):
def testit(self):
self.ids.layout.add_widget(Label(text = "Requirement A met."))
def addsome(self):
global x
self.ids.layout.add_widget(SomeWidget(id="XXX"+str(x)))
x = x +1
pass
class SomeWidget(Widget):
def change(self):
self.ids.REQB.text = "Requirement B met."
pass
class RequirementC(Widget):
def triggerC(self):
self.ids.ERRORBUTTON.text = "Requirement C met"
pass
class Attempt(App):
def build(self):
return presentation
pass
presentation = Builder.load_file("attempt.kv")
Attempt().run()
文件:try.kv
#:kivy 1.0
#:include attemptsupp.kv
#:include attemptsuppC.kv
# root
<ComplexBox>:
BoxLayout:
id: layout
size: root.size
Button:
id: ERRORBUTTON
text: "add"
on_press: root.addsome()
on_release: root.testit()
BoxLayout:
orientation: 'vertical'
ComplexBox:
RequirementC:
文件:trysupp.kv
FILE: attemptsupp.kv
#:kivy 1.0
# rules for the widget
<SomeWidget>:
BoxLayout:
pos: root.pos
size: root.size
orientation: "vertical"
Label:
id: REQB
text: "hello"
Button:
text: "world"
on_release: root.change()
文件:trysuppC.kv
FILE: attemptsuppC.kv
#:kivy 1.0
<RequirementC>:
Button:
id: REQC
text: "Press"
on_release: root.triggerC()
以kivy版本1.10和Python版本3.7.2运行，程序首先可以完美启动.但是，当我按下ID为ERRORBUTTON的标有"press"的按钮时，会出现此错误:
Running with kivy version 1.10 and Python version 3.7.2 the program first starts perfectly fine. But when I press on the Button labeled "press" with the id ERRORBUTTON I get this error:
...--default --nodebug --client --host localhost --port 57777...\attempt.py "
[INFO ] [Logger ] Record log in...\.kivy\logs\kivy_19-03-15_31.txt
[INFO ] [Kivy ] v1.10.1
[INFO ] [Python ] v3.7.2 (tags/v3.7.2:9a3ffc0492, Dec 23 2018,
...
[INFO ] [Window ] auto add sdl2 input provider
[INFO ] [Window ] virtual keyboard not allowed, single mode, not docked
[WARNING] [Lang ] attemptsupp.kv has already been included!
[WARNING] [Lang ] attemptsuppC.kv has already been included!
[INFO ] [Base ] Start application main loop
[INFO ] [GL ] NPOT texture support is available
[INFO ] [Base ] Leaving application in progress...
Traceback (most recent call last):
File "kivy\properties.pyx", line 838, in kivy.properties.ObservableDict.__getattr__
KeyError: 'ERRORBUTTON'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "...\ptvsd_launcher.py", line 45, in <module>
main(ptvsdArgs)
...
File "e:\Daten\Github_Projects\pc-clicker\attempt.py", line 35, in <module>
Attempt().run()
File "...\lib\site-packages\kivy\app.py", line 826, in run
runTouchApp()
...
File ...\lib\site-packages\kivy\lang\builder.py", line 64, in custom_callback
exec(__kvlang__.co_value, idmap)
File ...\attemptsuppC.kv", line 7, in <module>
on_release: root.triggerC()
File "...\attempt.py", line 25, in triggerC
self.ids.ERRORBUTTON.text = "Requirement C met"
File "kivy\properties.pyx", line 841, in kivy.properties.ObservableDict.__getattr__
AttributeError: 'super' object has no attribute '__getattr__'
即使我缩短了错误消息，也应该清楚会发生什么情况.我在RequirementC类中引用的ERRORBUTTON ID在词典中找不到.现在我的问题:
Even though I shortened the error message it should be clear what happens. The ERRORBUTTON id I am referencing in the RequirementC Class can't be found in the dictionary. Now to my question:
我如何使其起作用?我想念什么?
How can i make it work? What am I a missing?
简而言之，我尝试了一些事情:
Here in short a few things i have tried:
- 我尝试将BoxLayouts包装在Screen中，并通过screenmanager访问它们.
- 我尝试重新排列python代码中的顺序.(例如，首先加载主要kv文件)
- 我尝试使用Builder Factory并在其中注册不同的类.
- 我尝试更改参考.(例如self.ids.['ERRORBUTTON'] ...)
在我看来，这些尝试都没有奏效.
None of these attempts seem to have worked in my case.
所以总结一下:
我如何才能使跨不同类的kivy引用正常工作，为什么ERRORBUTTON ID不在我正在研究的字典中?
How can I get my kivy References across different classes to work properly and why is the ERRORBUTTON id not in the dict I am looking into?
推荐答案
因此，经过一番研究，我找到了所需的答案.对于那些可能也会在这里遇到我的问题的人来说，它来了:
So after a bit of research i found the answer i was looking for. For those who might also stumble over my problem here it comes:
class RequirementC(Widget):
def triggerC(self):
presentation.children[1].ids.ERRORBUTTON.text = "Requirement C met"
pass
通过遍历演示文稿的子级，可以使用"ids"方法.
By going over the children of the presentation it is possible to use the "ids" method.
但是对于那些现在想使用它的人，我建议遍历孩子以找到正确的ID，而不是给出硬"引用(children [1]).
But for those tempted to use it now i would recommend iterating over the children to find the correct id instead of giving a "hard" reference (children[1]).
这篇关于AttributeError:&#39; super&#39;对象没有属性&#39; __ getattr __&#39;在Kivy中将BoxLayout与多个kv文件一起使用时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！