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如何使用python或kivy訪問另一個類的標籤/ id並避免以下te錯誤？ 我在其他文章中搜索過，我發現不可能通過根目錄引用另一個類...... Hower，我不知道有任何其他方法可以做到這一點。我希望你能幫助我。 提前致謝。Kivy，python：如何從根類（FaceRecApp）訪問外部/子類？
FaceRec.py
庫
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager,Screen
from kivy.uix.widget import Widget
from kivy.uix.label import Label
from kivy.uix.settings import SettingsWithSidebar
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.actionbar import ActionBar
from kivy.logger import Logger
from kivy.config import Config
設置屏幕尺寸
Config.set('graphics', 'width', '850')
Config.set('graphics', 'height', '850')
主屏幕類
class ScreenManagement(ScreenManager):
pass
class HomeScreen(Screen):
pass
class HomeActionBar(ActionBar):
pass
class TitleLabel(Label):
pass
class StatusBoxLayout(BoxLayout):
pass
class ErrorsBoxLayout(BoxLayout):
pass
主要類
class FaceRecApp(App):
def build(self):
root = HomeScreen()
Logger.info('FaceRec.py: FaceRec.kv loaded')
self.settings_cls = MySettingsWithSidebar
Logger.info('FaceRec.py: MySettingsWithSidebar loaded')
status = root.ids.StatusBoxLayout.status
status.font_size = float(self.config.get('General', 'font_size'))
label = root.ids.label
label.font_size = float(self.config.get('General', 'font_size'))
return root
def build_config(self, config):
config.setdefaults('General', {'text': 'Default Hello','font_size': 20})
def build_settings(self, settings):
settings.add_json_panel('General', self.config, 'Settings.json')
def on_config_change(self, config, section, key, value):
Logger.info("FaceRec.py: App.on_config_change: {0}, {1}, {2}, {3}".format(config, section, key, value))
if section == "General":
if key == "text":
self.root.ids.label.text = value
elif key == 'font_size':
self.root.ids.label.font_size = float(value)
self.root.ids.StatusBoxLayout.status = float(value)
def close_settings(self, settings):
Logger.info("FaceRec.py: App.close_settings: {0}".format(settings))
super(FaceRecApp, self).close_settings(settings)
側邊欄的設置
class MySettingsWithSidebar(SettingsWithSidebar):
def on_close(self):
Logger.info('FaceRec.py: MySettingsWithSidebar.on_close')
def on_config_change(self, config, section, key, value):
Logger.info(
"FaceRec.py: MySettingsWithSidebar.on_config_change: "
"{0}, {1}, {2}, {3}".format(config, section, key, value))
執行
if __name__ == '__main__':
FaceRecApp().run()
FaceRec.kv
ScreenManagement:
HomeScreen:
<HomeActionBar>:
id: HomeActionBar
pos_hint: {'bottom':0}
ActionView:
use_separator: True
ActionPrevious:
title: 'Home'
with_previous: False
ActionOverflow:
ActionButton:
text: 'Settings'
icon: 'settings.png'
background_down: 'settings.png'
on_release:
app.open_settings()
<TitleLabel>:
id: TitleLabel
text: '[b]FaceRec[/b] - [i]The Face Recognition Project[/i]'
color: 0.0,0.3,1,1
markup: True
font_size: 38
<StatusBoxLayout>:
orientation: 'horizontal'
#padding: 100
Label:
id: status
text: 'Status: '
font_size: 20
Label:
id: status_value
text: 'Error'
font_size: 20
color: 1,0,0,1
<ErrorsBoxLayout>:
id: ErrorsBoxLayout
orientation: 'horizontal'
#padding: 100
Label:
id: errors
text: 'Errors No: '
font_size: 20
Label:
id: errors_value
text: '...'
font_size: 20
<HomeScreen>:
id: HomeScreen
BoxLayout:
orientation: 'vertical'
HomeActionBar:
TitleLabel:
BoxLayout:
cols: 2
orientation: 'vertical'
StatusBoxLayout:
ErrorsBoxLayout:
Label:
id: label
text: 'Does it run?'
Settings.json
[
{
"type": "string",
"title": "Label caption",
"desc": "Choose the text that appears in the label",
"section": "General",
"key": "text"
},
{
"type": "numeric",
"title": "Label font size",
"desc": "Choose the font size the label",
"section": "General",
"key": "font_size"
}
]
我試圖訪問標籤變量（FaceRecApp，建立和on_config_change功能）和程序正常運行。當我在設置中更改了標籤的字體大小時，HomeScreen中已應用更改。然後我已經添加的下面幾行代碼：
在構建（）：
status = root.ids.StatusBoxLayout.status
status.font_size = float(self.config.get('General', 'font_size'))
和on_config_change（）：
self.root.ids.StatusBoxLayout.status = float(value)
其結果是一個錯誤：
[INFO ] [Logger ] Record log in C:\***\.kivy\logs\kivy_17-04-17_109.txt
[INFO ] [Kivy ] v1.9.1
[INFO ] [Python ] v2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:53:40) [MSC v.1500 64 bit (AMD64)]
[INFO ] [Factory ] 179 symbols loaded
[INFO ] [Image ] Providers: img_tex, img_dds, img_gif, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO ] [Text ] Provider: sdl2
[INFO ] [OSC ] using <thread> for socket
[INFO ] [Window ] Provider: sdl2
[INFO ] [GL ] GLEW initialization succeeded
[INFO ] [GL ] OpenGL version <4.5.0 NVIDIA 376.53>
[INFO ] [GL ] OpenGL vendor <NVIDIA Corporation>
[INFO ] [GL ] OpenGL renderer <GeForce ***/PCIe/SSE2>
[INFO ] [GL ] OpenGL parsed version: 4, 5
[INFO ] [GL ] Shading version <4.50 NVIDIA>
[INFO ] [GL ] Texture max size <16384>
[INFO ] [GL ] Texture max units <32>
[INFO ] [Window ] auto add sdl2 input provider
[INFO ] [Window ] virtual keyboard not allowed, single mode, not docked
[INFO ] [FaceRec.py ] FaceRec.kv loaded
[INFO ] [FaceRec.py ] MySettingsWithSidebar loaded
Traceback (most recent call last):
File "C:/***/PycharmProjects/face_recognition_2/FaceRec.py", line 114, in <module>
FaceRecApp().run()
File "C:\Python27\lib\site-packages\kivy\app.py", line 802, in run
root = self.build()
File "C:/***/PycharmProjects/face_recognition_2/FaceRec.py", line 65, in build
status = root.ids.StatusBoxLayout.status
File "kivy\properties.pyx", line 757, in kivy.properties.ObservableDict.__getattr__ (kivy\properties.c:11882)
AttributeError: 'super' object has no attribute '__getattr__'
Process finished with exit code 1
我已閱讀此文章（以及其他許多...）： How to access id/widget of different class from a kivy file (.kv)? 但我的程序尚未運行。
再次感謝您的支持。