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[英]Python-Kivy AttributeError: 'NoneType' object has no attribute 'text'
[英]AttributeError: 'NoneType' object has no attribute 'text' kivy
我正在尝试从ABC.kv
文件中存在的文本框中提取值。 我在此url找到了类似的问题。 我尝试应用相同的解决方案,但错误不断弹出。 我不知道问题的根源在哪里。 有人足够友善地向我阐明所面临的问题吗?
ABC.py
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivy.uix.popup import Popup
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
class LoginScreen(BoxLayout):
username_input = ObjectProperty()
passwd_input = ObjectProperty()
def __init__(self, **kwargs):
super(LoginScreen, self).__init__(**kwargs)
boxp = BoxLayout(orientation='vertical')
labs = Label(text='')
self.boxp = BoxLayout(orientation='vertical')
self.labs = Label(text='')
self.boxp.add_widget(self.labs)
self.box = BoxLayout()
self.box.orientation = 'horizontal'
btn5 = Button(text="ok", size_hint=(0.5, 0.5))
btn5.bind(on_release=self.checkin())
self.box.add_widget(btn5)
self.box.add_widget(Button(text='cancel', size_hint=(0.5, 0.5), on_release=self.cancel_button_hit))
self.boxp.add_widget(self.box)
self.popup = Popup(title="LOGIN SUCCESSFUL",
content=self.boxp,
size=(200, 200),
size_hint=(0.3, 0.3),
auto_dismiss=True)
def checkin(self):
if self.username_input.text=="root" and self.passwd_input.text=="root":
self.labs.text = self.username_input.text
self.popup.open()
else:
self.popup.title='Failed Login'
self.labs.text = 'Failed'
self.popup.open()
def cancel_button_hit(self, instance):
self.popup.dismiss()
class AnotherScreen(Screen):
pass
class ScreenManagement(ScreenManager):
pass
class MainApp(App):
def build(self):
return LoginScreen()
MainApp().run()
广播电台
#: import FadeTransition kivy.uix.screenmanager.FadeTransition
ScreenManagement:
transition: FadeTransition()
LoginScreen:
AnotherScreen:
<LoginScreen>:
orientation: "vertical"
username_input: username
passwd_input: passwd
padding: 10
spacing: 10
name: 'login'
BoxLayout:
orientation: "vertical"
Label:
text: "Username"
TextInput:
id: username
Label:
text: "password"
TextInput:
id: passwd
password: True
Button:
on_release: root.checkin()
text: 'login'
font_size: 50
<AnotherScreen>:
name: 'other'
Button:
on_release: app.root.current = 'main'
text: 'back to the home screen'
font_size: 50
追溯:
Traceback (most recent call last):
File "C:/Users/Admin/PycharmProjects/guihm/ABC.py", line 59, in <module>
MainApp().run()
File "C:\Python34\lib\site-packages\kivy\app.py", line 802, in run
root = self.build()
File "C:/Users/Admin/PycharmProjects/guihm/ABC.py", line 57, in build
return LoginScreen()
File "C:/Users/Admin/PycharmProjects/guihm/ABC.py", line 27, in __init__
btn5.bind(on_release=self.checkin())
File "C:/Users/Admin/PycharmProjects/guihm/ABC.py", line 38, in checkin
if self.username_input.text=="root" and self.passwd_input.text=="root":
AttributeError: 'NoneType' object has no attribute 'text'
username_input和password_input缺少自己。 删除自我。 在他们中
当用户在popup
单击btn5
,没有必要再次调用checkin
方法。 您已经在ABC.kv
文件中存在的登录按钮的定义中调用了它。 首先,从btn5.bind(on_release=self.checkin())
行中删除checkin
后的括号。 我建议调用不同的方法来处理on_release
的动作btn5
。
btn5.bind(on_release=self.success)
定义一种称为success
的方法
def success(self,instance):
self.popup1.dismiss()
还要将ScreenManagement
类包含在.kv文件中的尖括号中。
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