【发布时间】：2022-07-18 03:17:46
【问题描述】：
此按钮有问题。我一直在更改对屏幕管理器的引用，因为我有两个，但我一直收到类似的错误。任何帮助将不胜感激，因为我意识到这可能是一个愚蠢或明显的错误。
我已经删除了其中一个屏幕，因为代码对于 stackoverflow 来说太多了 - 显然这不是问题，因为它与问题无关。
from kivy import Config
from kivy.lang import Builder
from kivy.metrics import dp
from kivy.properties import ObjectProperty
from kivy.properties import StringProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.popup import Popup
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.textinput import TextInput
from kivymd.app import MDApp
from kivymd.theming import ThemableBehavior
from kivymd.uix.list import MDList, OneLineIconListItem
from kivymd.uix.menu import MDDropdownMenu
from kivymd.uix.navigationdrawer import MDNavigationLayout
Config.set('input', 'mouse', 'mouse,disable_multitouch')
class DrawerList(ThemableBehavior, MDList, Screen):
pass
class NavLayout(MDNavigationLayout):
pass
class Login(Screen):
nav_drawer = ObjectProperty()
class Nav(Screen):
Login = ObjectProperty()
ScreenManager = ObjectProperty
homepage = ObjectProperty()
class IconListItem(OneLineIconListItem):
icon = StringProperty()
class Homepage(Screen):
Login = ObjectProperty()
nav_drawer = ObjectProperty()
ScreenManager = ObjectProperty
def __init__(self, **kw):
super().__init__(**kw)
self.menu = None
self.menu_items = None
def submit(self):
Popup(title='Submitted', content=Label(text='Case has been submitted and will be reviewed'),
size_hint=(0.5, 0.5)).open()
sm = self.ids.screen_manager
scr = sm.get_screen('Create Case')
for child in scr.children:
if isinstance(child, TextInput):
child.text = ''
def dropdown(self):
self.menu_items = [
{
"viewclass": "IconListItem",
"icon": "git",
"font_size": 25,
"text": f"Nice {i}",
"height": dp(56),
"on_release": lambda x=f"Item {i}": self.set_item(x),
} for i in range(5)
]
self.menu = MDDropdownMenu(
caller=self.ids.drop_item,
items=self.menu_items,
position="center",
width_mult=4,
)
self.menu.open()
def set_item(self, text_item):
self.ids.drop_item.set_item(text_item)
self.menu.dismiss()
class AddNewCustomer(Screen):
nav_drawer = ObjectProperty()
class AddNewStaff(Screen):
pass
class ScreenManager(ScreenManager):
Login = ObjectProperty()
homepage = ObjectProperty()
class ContentNavigationDrawer(BoxLayout):
pass
class MainApp(MDApp):
def build(self):
# Window.maximize()
# self.theme_cls.theme_style = "Light"
# self.theme_cls.primary_hue = "900"
login = Builder.load_file("login.kv")
return login
if __name__ == "__main__":
MainApp().run()
ScreenManager:
Login:
Homepage:
AddNewCustomer:
Nav:
DrawerList:
<Login>:
name: "login"
font_name: "Century"
MDCard:
size_hint: None, None
size: 700, 800
pos_hint: {"center_x": 0.5, "center_y": 0.5}
elevation: 10
padding: 25
spacing: 25
orientation: 'vertical'
Image:
source: 'images/asteria.png'
size: 100, 200
MDLabel:
id: login
font_size: 40
font_name: "Century"
halign: 'center'
size_hint_y: None
height: self.texture_size[1]
padding_y: 15
MDTextFieldRound:
id: user
hint_text: "username"
font_name: "Century"
icon_right: "account"
size_hint_x: None
width: 200
font_size: 18
pos_hint: {"center_x": 0.5}
MDTextFieldRound:
id: password
hint_text: "password"
font_name: "Century"
icon_right: "eye-off"
size_hint_x: None
width: 200
font_size: 18
pos_hint: {"center_x": 0.5}
password: True
MDRoundFlatButton:
text: "LOGIN"
font_size: 12
font_name: "Century"
pos_hint: {"center_x": 0.5}
on_release:
root.manager.current = "homepage"
root.manager.transition.direction = "left"
MDRoundFlatButton:
text: "CLEAR"
font_size: 12
font_name: "Century"
pos_hint: {"center_x": 0.5}
on_press: app.clear()
Widget:
size_hint_y: None
height: 50
<Nav>:
ScrollView:
MDList:
OneLineListItem:
text: "[font=Century]Add New Customer[/font]"
on_release:
root.nav_drawer.set_state("close")
root.screen_manager.current = "addNewCustomer"
root.screen_manager.transition.direction = "right"
OneLineListItem:
text: "[font=Century]Add New Staff[/font]"
font_size: 15
halign: "center"
on_release:
root.nav_drawer.set_state("close")
root.screen_manager.current = "addNewStaff"
OneLineListItem:
text: "[font=Century]Case List[/font]"
font_size: 15
halign: "center"
on_release:
root.nav_drawer.set_state("close")
root.screen_manager.current = "caseList"
OneLineListItem:
text: "[font=Century]Create Case[/font]"
font_size: 15
halign: "center"
on_release:
root.nav_drawer.set_state("close")
root.screen_manager.transition.direction = "left"
root.screen_manager.current = "Create Case"
OneLineListItem:
text: "[font=Century]Create Case Version 2.0[/font]"
font_size: 15
halign: "center"
on_release:
root.nav_drawer.set_state("close")
root.screen_manager.transition.direction = "left"
root.screen_manager.current = "Create Case Version 2.0"
OneLineListItem:
text: "[font=Century]Create Case Version 3.0[/font]"
font_size: 15
halign: "center"
on_release:
root.nav_drawer.set_state("close")
root.screen_manager.transition.direction = "left"
root.screen_manager.current = "Create Case Version 3.0"
OneLineListItem:
text: "[font=Century]Log Out[/font]"
font_size: 15
halign: "center"
on_release:
root.nav_drawer.set_state("close")
root.manager.current = "login"
root.manager.transition.direction = "right"
<Homepage>:
name: "homepage"
Screen:
MDNavigationLayout:
ScreenManager:
id: screen_manager
Screen:
name: "Homepage"
MDLabel:
text: "Welcome Home"
font_name: "Century"
halign: "center"
Screen:
name: "addNewCustomer"
MDLabel:
text: "Add New customer"
font_name: "Century"
halign: "center"
Screen:
name: "addNewStaff"
MDLabel:
text: "Add New Staff"
font_name: "Century"
halign: "center"
Screen:
name: "caseList"
MDLabel:
text: "Case List"
font_name: "Century"
halign: "center"
Screen:
name: "casePool"
MDLabel:
text: "Case Pool"
font_name: "Century"
halign: "center"
Screen:
name: "Create Case Version 2.0"
MDLabel:
text: "Case Title"
font_size: 15
size_hint_x: None
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.875, "center_x": 0.180}
MDTextFieldRound:
id: CaseTitle
hint_text: "Info Here"
icon_right: "Case Title"
size_hint_x: None
multiline: True
height: 4000
width: 275
font_size: 15
pos_hint: {"top": 0.863, "center_x": 0.220}
MDLabel:
text: "Customer"
font_size: 15
size_hint_x: None
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.791, "center_x": 0.180}
MDTextFieldRound:
id: Customer
hint_text: "Info Here"
mode:"rectangle"
icon_right: "Customer"
size_hint_x: None
width: 275
font_size: 15
pos_hint: {"top": 0.779, "center_x": 0.220}
MDLabel:
text: "Customer Forename"
font_size: 15
size_hint_x: None
multiline: False
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.707, "center_x": 0.180}
MDTextFieldRound:
id: Customer Forename
hint_text: "Info here"
mode:"rectangle"
icon_right: "Customer"
size_hint_x: None
width: 275
font_size: 14
pos_hint: {"top": 0.687, "center_x": 0.220}
MDLabel:
text: "Customer Surname"
font_size: 15
size_hint_x: None
multiline: False
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.623, "center_x": 0.180}
MDTextFieldRound:
id: Customer Surname
hint_text: "Info Here"
mode:"rectangle"
icon_right: "Customer"
size_hint_x: None
width: 275
font_size: 14
pos_hint: {"top": 0.603, "center_x": 0.220}
MDLabel:
text: "Alternative email"
font_size: 15
size_hint_x: None
multiline: False
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.803, "center_x": 0.360}
MDTextFieldRound:
id: Alternative Email
hint_text: "Info Here"
mode:"rectangle"
size_hint_x: None
width: 275
font_size: 15
pos_hint: {"top": 0.779, "center_x": 0.400}
MDLabel:
text: "Alternative Phone"
font_size: 15
size_hint_x: None
multiline: False
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.707, "center_x": 0.360}
MDTextFieldRound:
id: Alternative phone
hint_text: "Info Here"
mode:"rectangle"
size_hint_x: None
width: 275
font_size: 15
pos_hint: {"top": 0.687, "center_x": 0.400}
MDLabel:
text: "Case Source"
font_size: 15
size_hint_x: None
multiline: False
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.623, "center_x": 0.360}
MDTextFieldRound:
id: Case Source
hint_text: "Info Here"
mode:"rectangle"
size_hint_x: None
width: 275
font_size: 15
pos_hint: {"top": 0.603, "center_x": 0.400}
MDLabel:
text: "Case Priority"
font_size: 15
size_hint_x: None
multiline: False
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.523, "center_x": 0.360}
MDTextFieldRound:
id: Case Priority
hint_text: "Info Here"
mode:"rectangle"
size_hint_x: None
width: 275
font_size: 15
pos_hint: {"top": 0.503, "center_x": 0.400}
MDLabel:
text: "Case Category"
font_size: 15
size_hint_x: None
multiline: False
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.423, "center_x": 0.360}
MDDropDownItem:
id: drop_item
pos_hint: {"center_y": .403, "center_x": 0.400}
text: 'filler text in here'
width: 275
on_release: root.dropdown()
MDLabel:
text: "Possible Cases"
font_size: 15
size_hint_x: None
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.887 , "center_x": 0.360}
MDTextFieldRound:
id: PossibleCases
hint_text: "Info Here"
icon_right: "Case Title"
size_hint_x: None
width: 275
font_size: 15
pos_hint: {"top": 0.863, "center_x": 0.400}
ThreeLineListItem:
text: "Knowledge Helper"
font_size: 15
secondary_text: "This is a multi-line label where you can"
tertiary_text: "fit more text than usual"
width: 275
size_hint_x: None
pos_hint: {"top": 0.915, "center_x": 0.645}
MDLabel:
text: "Case Description"
font_size: 15
size_hint_x: None
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.883, "center_x": 0.745}
MDTextField:
id: Case Description
hint_text: "Info Here"
icon_right: "Case Title"
size_hint_x: None
width: 275
multiline: True
font_size: 15
pos_hint: {"top": 0.863, "center_x": 0.790}
MDRoundFlatButton:
text: "Submit"
font_size: 60
pos_hint: {"center_y": 0.400,"center_x": 0.700}
on_release: root.submit()
Screen:
name: "Create Case Version 3.0"
MDLabel:
text: "Case Title"
font_name: "Century"
font_size: 30
size_hint_x: None
width: 275
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.875, "center_x": 0.180}
MDTextFieldRound:
id: CaseTitle
hint_text: "Info Here"
font_name: "Century"
icon_right: "Case Title"
size_hint_x: None
multiline: True
height: 4000
width: 275
font_size: 30
pos_hint: {"top": 0.860, "center_x": 0.180}
MDLabel:
text: "Customer"
font_name: "Century"
font_size: 30
size_hint_x: None
width: 275
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.788, "center_x": 0.180}
MDTextFieldRound:
id: Customer
hint_text: "Info Here"
font_name: "Century"
mode:"rectangle"
icon_right: "Customer"
size_hint_x: None
width: 275
font_size: 30
pos_hint: {"top": 0.773, "center_x": 0.180}
MDLabel:
text: "Customer Forename"
font_size: 30
font_name: "Century"
size_hint_x: None
width: 300
multiline: False
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.701, "center_x": 0.180}
MDTextFieldRound:
id: Customer Forename
hint_text: "Info here"
font_name: "Century"
mode:"rectangle"
icon_right: "Customer"
size_hint_x: None
width: 275
font_size: 30
pos_hint: {"top": 0.687, "center_x": 0.180}
MDLabel:
text: "Customer Surname"
font_size: 30
font_name: "Century"
size_hint_x: None
width: 300
multiline: False
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.615, "center_x": 0.180}
MDTextFieldRound:
id: Customer Surname
hint_text: "Info Here"
font_name: "Century"
mode:"rectangle"
icon_right: "Customer"
size_hint_x: None
width: 275
font_size: 30
pos_hint: {"top": 0.601, "center_x": 0.180}
MDLabel:
text: "Alternative Email"
font_size: 30
font_name: "Century"
size_hint_x: None
multiline: False
width: 275
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.875, "center_x": 0.380}
MDTextFieldRound:
id: Alternative Email
hint_text: "ewan@jccomtech.com"
font_name: "Century"
mode:"rectangle"
size_hint_x: None
width: 275
font_size: 25
pos_hint: {"top": 0.860, "center_x": 0.380}
MDLabel:
text: "Alternative Phone"
font_size: 30
font_name: "Century"
size_hint_x: None
width: 275
multiline: False
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.788, "center_x": 0.380}
MDTextFieldRound:
id: Alternative phone
hint_text: "Info Here"
font_name: "Century"
mode:"rectangle"
size_hint_x: None
width: 275
font_size: 25
pos_hint: {"top": 0.773, "center_x": 0.380}
MDLabel:
text: "Case Source"
font_size: 30
font_name: "Century"
size_hint_x: None
multiline: False
width: 275
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.701, "center_x": 0.380}
MDTextFieldRound:
id: Case Source
hint_text: "Info Here"
font_name: "Century"
mode:"rectangle"
size_hint_x: None
width: 275
font_size: 25
pos_hint: {"top": 0.687, "center_x": 0.380}
MDLabel:
text: "Case Priority"
font_size: 30
font_name: "Century"
size_hint_x: None
multiline: False
width: 275
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.615, "center_x": 0.380}
MDTextFieldRound:
id: Case Priority
hint_text: "Info Here"
font_name: "Century"
mode:"rectangle"
size_hint_x: None
width: 275
font_size: 25
pos_hint: {"top": 0.595, "center_x": 0.380}
MDLabel:
text: "Case Category"
font_size: 30
size_hint_x: None
font_name: "Century"
multiline: False
width: 275
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.423, "center_x": 0.380}
MDDropDownItem:
id: drop_item
font_size: 25
pos_hint: {"center_y": .423, "center_x": 0.450}
font_name: "Century"
width: 275
on_release: root.dropdown()
MDLabel:
text: "Knowledge Helper"
font_size: 30
font_name: "Century"
width: 275
multiline: False
size_hint_x: None
pos_hint: {"center_y": 0.875, "center_x": 0.580}
MDTextField:
id: Knowledge Helper
hint_text: "Info Here"
font_name: "Century"
icon_right: "Case Title"
size_hint_x: None
width: 275
multiline: True
font_size: 15
pos_hint: {"top": 0.863, "center_x": 0.580}
MDLabel:
text: "Case Description"
font_size: 30
font_name: "Century"
size_hint_x: None
width: 275
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.883, "center_x": 0.780}
MDTextField:
id: Case Description
hint_text: "Info Here"
font_name: "Century"
icon_right: "Case Title"
size_hint_x: None
width: 275
multiline: True
font_size: 15
pos_hint: {"top": 0.863, "center_x": 0.780}
MDLabel:
text: "Possible Cases"
font_size: 30
font_name: "Century"
size_hint_x: None
width: 275
bold: True
color: 0.204, 0.204, 0.204, 1
pos_hint: {"center_y": 0.351 , "center_x": 0.380}
MDTextFieldRound:
id: PossibleCases
hint_text: "Info Here"
font_name: "Century"
icon_right: "Case Title"
size_hint_x: None
width: 275
font_size: 25
pos_hint: {"top": 0.337, "center_x": 0.380}
MDRoundFlatButton:
text: "Submit"
font_size: 60
font_name: "Century"
pos_hint: {"center_y": 0.400,"center_x": 0.700}
on_release: root.submit()
BoxLayout:
orientation: 'vertical'
MDToolbar:
title: '[font=Century]Navigation[/font]'
height:'100dp'
font_name: "Century"
left_action_items: [['menu', lambda x: nav_drawer.set_state('open')]]
canvas:
Rectangle:
pos: (((self.parent.size[0])/2)+760,self.pos[1])
size: (200, 100)
source: 'images/asteria3.png'
Button:
screen_manager: screen_manager
manager: root.manager
text:'Homepage'
font_name: 'Century'
pos: (((self.parent.size[0])/2)+500,self.pos[1])
size_hint: None, None
size: (100, 100)
on_release: root.ScreenManager.current = "homepage"
Widget:
MDNavigationDrawer:
id: nav_drawer
Nav:
screen_manager: screen_manager
nav_drawer: nav_drawer
manager: root.manager
【问题讨论】：
-
如何重现该错误？我可以运行您的代码，但不会出现该错误。
-
您好，顶栏上有一个主页按钮。在任何页面上单击它时都会引发该错误。
-
HomePage按钮不在屏幕上。现在看看。