我正在尝试在我的主屏幕上动态创建 OneLineListItems，但无法识别 ID。我尝试了很多，但我没有找到解决方案。
main.py：
class CustomDialogContent(MDGridLayout):
pass
class Content(BoxLayout):
manager = ObjectProperty()
nav_drw = ObjectProperty()
pass
class Demo(ScreenManager):
pass
class Main(MDApp):
def build(self):
return Demo()
def show_dialog(self):
close_button = MDFlatButton(text='Close', pos_hint={'x': 0, 'y': -.3}, on_release=self.close_dialog)
ok_button = MDFlatButton(text='OK', pos_hint={'x': 0, 'y': -.3}, on_release=self.ok_dialog)
self.dialog = MDDialog(
title="Dialog Title",
size_hint=(0.8, 0.3),
type="custom",
content_cls=CustomDialogContent(),
buttons=[ok_button, close_button],
auto_dismiss= False
)
self.dialog.open()
这是我的主要内容，包括我的课程，到目前为止这部分运行良好，我已经包含了一个 Navigationdrawer 和一个在按下按钮时打开的对话框。
def post_text(self, text1, text2, *args):
print(text1)
print(text2)
if text1:
screen = self.root.ids.screen_manager.get_screen("First")
screen.ids.list_view.add_widget(OneLineListItem(text=text1))
screen.ids.list_view.add_widget(OneLineListItem(text=text2))
#self.ids.list_view.add_widget(OneLineListItem(text=text1))
#self.ids.list_view.add_widget(OneLineListItem(text=text1))
这就是我的问题所在，我不明白为什么 id list_view 在应该存储在 self.ids 字典中时没有被识别。做后者被注释掉也不起作用。
这是我的其余代码，它也在我的主类中
def ok_dialog(self, *args):
text_field_1 = self.dialog.content_cls.ids.text_field_1
text_field_2 = self.dialog.content_cls.ids.text_field_2
self.post_text(text_field_1.text, text_field_2.text)
self.close_dialog()
def close_dialog(self, *args):
self.dialog.dismiss()
Main().run()
这也可以正常工作，在这里我调用我的 post_text 函数，它按应有的方式传递输入文本。
main.kv:
#: import NoTransition kivy.uix.screenmanager.NoTransition
<CustomDialogContent>
#cols: 1
rows: 2
spacing: '12dp'
padding: '12dp'
size_hint_y: None
height: '120dp'
MDTextField:
id: text_field_1
size_hint_x: .5
hint_text: "Text Field 1"
MDTextField:
id: text_field_2
size_hint_x: .5
hint_text: "Text Field 2"
<Content>:
ScrollView:
MDList:
OneLineListItem:
text: "Go to screen 1"
on_release:
root.manager.transition = NoTransition()
root.manager.current = "First"
OneLineListItem:
text: "Go to screen 2"
on_release:
root.manager.transition = NoTransition()
root.manager.current = "Second"
<Demo>:
Screen:
MDTopAppBar:
pos_hint: {"top": 1}
#title: "Navigation Drawer"
evelation: 8
left_action_items: [["menu",lambda x: nav_drawer.set_state("open")]]
FloatLayout:
MDTextField:
hint_text: "Search"
#color_mode: 'custom'
max_text_length: 15
size_hint_x: 0.425
line_color_focus: 0.92, 0.25, 0.20
hint_text_color_normal: "red"
text_color_focus: '#ff0000'
text_color_normal: '#00ff00'
pos_hint: {"right": 1.0, "top": 1.0}
MDNavigationDrawer:
id: nav_drawer
Content:
manager: screen_manager
nav_drw: nav_drawer
MDNavigationLayout:
ScreenManager:
id: screen_manager
Screen:
id: main_screen
name: "First"
MDLabel:
text: "First Screen"
MDList:
id:list_view
name: "list_view"
MDIconButton:
icon:'android'
pos_hint: {"y":0.1, "x": 0.8}
on_release:
app.show_dialog()
Screen:
name: "Second"
MDLabel:
text: "2nd Screen"
可以看到list_view定义在Screen(id: main_screen)中
File "kivy\properties.pyx", line 961, in kivy.properties.ObservableDict.__getattr__
KeyError: 'list_view'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\addyi\PycharmProjects\KivyApp2\main.py", line 73, in <module>
Main().run()
File "C:\Users\addyi\PycharmProjects\TestApp\venv\lib\site-packages\kivy\app.py", line 955, in run
runTouchApp()
File "C:\Users\addyi\PycharmProjects\TestApp\venv\lib\site-packages\kivy\base.py", line 574, in runTouchApp
EventLoop.mainloop()
File "C:\Users\addyi\PycharmProjects\TestApp\venv\lib\site-packages\kivy\base.py", line 339, in mainloop
self.idle()
File "C:\Users\addyi\PycharmProjects\TestApp\venv\lib\site-packages\kivy\base.py", line 383, in idle
self.dispatch_input()
File "C:\Users\addyi\PycharmProjects\TestApp\venv\lib\site-packages\kivy\base.py", line 334, in dispatch_input
post_dispatch_input(*pop(0))
File "C:\Users\addyi\PycharmProjects\TestApp\venv\lib\site-packages\kivy\base.py", line 302, in post_dispatch_input
wid.dispatch('on_touch_up', me)
File "kivy\_event.pyx", line 731, in kivy._event.EventDispatcher.dispatch
File "C:\Users\addyi\PycharmProjects\TestApp\venv\lib\site-packages\kivymd\uix\button\button.py", line 1187, in on_touch_up
return super().on_touch_up(touch)
File "C:\Users\addyi\PycharmProjects\TestApp\venv\lib\site-packages\kivymd\uix\behaviors\ripple_behavior.py", line 404, in on_touch_up
return super().on_touch_up(touch)
File "C:\Users\addyi\PycharmProjects\TestApp\venv\lib\site-packages\kivy\uix\behaviors\button.py", line 179, in on_touch_up
self.dispatch('on_release')
File "kivy\_event.pyx", line 727, in kivy._event.EventDispatcher.dispatch
File "kivy\_event.pyx", line 1307, in kivy._event.EventObservers.dispatch
File "kivy\_event.pyx", line 1231, in kivy._event.EventObservers._dispatch
File "C:\Users\addyi\PycharmProjects\KivyApp2\main.py", line 65, in ok_dialog
self.post_text(text_field_1.text, text_field_2.text)
File "C:\Users\addyi\PycharmProjects\KivyApp2\main.py", line 53, in post_text
screen.ids.list_view.add_widget(OneLineListItem(text=text1))
File "kivy\properties.pyx", line 964, in kivy.properties.ObservableDict.__getattr__
AttributeError: 'super' object has no attribute '__getattr__'
I have also added the error code if anybody needs it