问题描述
好吧，这让我像过去两天一样发疯。这真的很烦人，所以我正在使用 kivy 构建一个应用程序，在使用“像馅饼一样简单” tkinter 之后，我认为是时候学习 kivy（因为它具有移动兼容性）。
#我想学习引用不同的小部件# 我在 YouTube 和 google 上搜索了几个小时但无济于事 我不断收到错误消息
我的代码：
.py
# Imports
import webbrowser
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import Screen
# Todo: Monetizing the Application
def Monetize():
pass
def hide():
# hidden func thats not related to code for Now
# configuring the Application
class HyperSearch(App):
main_text = "None"
# initialing the Application
def __init__(self,**kwargs):
super(HyperSearch,self).__init__(**kwargs)
self.a = Builder.load_file("kivy_file.kv")
def get_search(self):
engine_input = self.root.ids.raw_search
# building the Application
def build(self):
screen = Screen()
screen.add_widget(self.a)
# screen.add_widget("")
return screen
# Running The Application in main loop
if __name__ == "__main__":
HyperSearch().run()
# Todo: copyright Claim The Application and its code
.kv
<HyperSearch>:
GridLayout:
cols: 2
BoxLayout:
orientation: "vertical"
size_hint: None,1
size: "120dp",0
spacing: 5
Button:
text: "Toggle Shopping Search"
text_size: self.size
halign: 'center'
valign: 'middle'
Button:
text: "Toggle Music Search"
text_size: self.size
halign: 'center'
valign: 'middle'
Button:
text: "View History"
text_size: self.size
halign: 'center'
valign: 'middle'
BoxLayout:
orientation: "vertical"
valign: "top"
TextInput:
valign: "center"
orientation: "vertical"
font_size: 30
size_hint: 1,None
size: 0,"50dp"
pos_hint: {"top":1}
hint_text: "Search-Engine"
icon_right: "android"
helper_text: "Devices with under 1gb RAM may crash"
helper_text_mode: "on_focus"
multiline: False
id: raw_search
GridLayout:
cols: 2
size_hint: 1,"100dp"
spacing: 10
Button:
text: "Search!!"
text_size: self.size
halign: 'center'
valign: 'middle'
size_hint: .5,1
on_press: app.get_search()
Button:
text: "Small Search :("
text_size: self.size
halign: 'center'
valign: 'middle'
size_hint: .5,1
GridLayout:
cols: 2
size_hint: 1,"100dp"
Label:
text: "log:"
Label:
text: app.main_text
和
我的错误
[INFO ] [Base ] Start application main loop
[INFO ] [Base ] Leaving application in progress...
Traceback (most recent call last):
File "kivy\properties.pyx",line 861,in kivy.properties.ObservableDict.__getattr__
KeyError: 'raw_search'
During handling of the above exception,another exception occurred:
Traceback (most recent call last):
File "C:\documents\kivy-trial\main.py",line 63,in <module>
HyperSearch().run()
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\app.py",line 950,in run
runTouchApp()
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\base.py",line 582,in runTouchApp
EventLoop.mainloop()
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\base.py",line 347,in mainloop
self.idle()
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\base.py",line 391,in idle
self.dispatch_input()
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\base.py",line 342,in dispatch_input
post_dispatch_input(*pop(0))
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\base.py",line 248,in post_dispatch_input
listener.dispatch('on_motion',etype,me)
File "kivy\_event.pyx",line 709,in kivy._event.Eventdispatcher.dispatch
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\core\window\__init__.py",line 1412,in on_motion
self.dispatch('on_touch_down',line 1428,in on_touch_down
if w.dispatch('on_touch_down',touch):
File "kivy\_event.pyx",in kivy._event.Eventdispatcher.dispatch
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\uix\relativelayout.py",line 297,in on_touch_down
ret = super(RelativeLayout,self).on_touch_down(touch)
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\uix\widget.py",line 545,in on_touch_down
if child.dispatch('on_touch_down',in kivy._event.Eventdispatcher.dispatch
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\uix\widget.py",in kivy._event.Eventdispatcher.dispatch
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\uix\behaviors\button.py",line 151,in on_touch_down
self.dispatch('on_press')
File "kivy\_event.pyx",line 705,in kivy._event.Eventdispatcher.dispatch
File "kivy\_event.pyx",line 1248,in kivy._event.EventObservers.dispatch
File "kivy\_event.pyx",line 1132,in kivy._event.EventObservers._dispatch
File "C:\Users\mayan\AppData\Local\Programs\Python\python39\lib\site-packages\kivy\lang\builder.py",line 57,in custom_callback
exec(__kvlang__.co_value,idmap)
File "C:\Documents\kivy-trial\kivy_file.kv",line 58,in <module>
on_press: app.get_search()
File "C:\documents\kivy-trial\main.py",line 51,in get_search
engine_input = self.root.ids.raw_search
File "kivy\properties.pyx",line 864,in kivy.properties.ObservableDict.__getattr__
AttributeError: 'super' object has no attribute '__getattr__'
Process finished with exit code 1
请帮助，在此先感谢那些花时间阅读我的帖子的人
解决方法
让我们举一个简单的例子来说明如何使用 kivy 的魔法 id 属性！
from kivy.lang import Builder
from kivymd.app import MDApp
KV = '''
BoxLayout:
Button:
id: my_button
text: "let's try !"
'''
class MyApp(MDApp):
def build(self):
self.screen = Builder.load_string(KV)
print("this is the app:",self)
print("this is the visual of the app:",self.screen)
print("this is the dictionnary of all object referenced with id in the app KV:",self.screen.ids)
print("this is my button:",self.screen.ids["my_button"])
print("let's bind a function to my button referenced in the KV object")
self.screen.ids["my_button"].bind(on_press=self.on_button_press)
return self.screen
def on_button_press(self,instance):
print("this is the widget linked to this event call (here it's the button):",instance)
print("here you can do whatever you want,yes kivy is easy !")
if __name__ == '__main__':
MyApp().run()
如果有什么不清楚的地方或者我错过了问题，请不要犹豫提问:)
PS：如果你想使用 .kv 文件，它会以同样的方式工作！只需将 Builder.load_string(KV) 替换为 Builder.load_file("kivy_file.kv")。
你已经做得很好，我只想说它不会改变任何东西。 ;)
为了使用 ids，您必须在 id 中定义 kv。因此，要使用 raw_search id，您必须像这样在 kv 中定义它：
TextInput:
id: raw_search
然后在您的代码中：
def get_search(self):
engine_input = self.a.ids.raw_search.text
print(engine_input)
请注意，ids 字典是在作为包含 id 的规则的根的小部件中构建的。在您的情况下，ids 在 GridLayout 中。因此，要访问该 GridLayout 小部件，您必须使用 self.a。此外，我认为您的 <HyperSearch>: 中的 kv 行是一个拼写错误并已将其删除。