求帮忙看看哪里出错了
用kivy写了一个app的开始和登录（未完成），注册页面，在pycharm上：在py文件中的代码为：
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.textinput import TextInput
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
from kivy.uix.screenmanager import Screen,ScreenManager
class WelcomePage(Screen):
pass
class LogIn(Screen):
pass
class Register(Screen):
pass
class TransitionWindow(ScreenManager):
pass
kv = Builder.load_file("my.kv")
class MyApp(App):
def build(self):
return kv
if __name__ == "__main__":
MyApp().run()
在my.kv文件中的代码为：
TransitionWindow:
WelcomePage:
LogIn:
Register:
<WelcomePage>:
orientation:"vertical"
Label:
text:"Welcome!"
text_size:cm(6),mm(28)
font_size: 40
italic:True
color:.8,.2,.1,3
FloatLayout:
Button:
text:"Log In"
size_hint:.2,.15
font_size:30
pos:185,100
background_color:0,1,1,1
on_release:app.root.current = "login"
Button:
text:"Register"
size_hint:.2,.15
font_size:30
pos:485,100
background_color:0,1,1,1
on_release:app.root.current = "register"
<LogIn>:
name: "login"
FloatLayout:
Label:
text:"Fill the following information to log in"
font_size: 15
italic:True
TextInput:
text:"account"
multiline = False
pos = 300,500
TextInput:
text:"password"
multiline = False
pos = 300,700
Button:
text:"Enter"
on_release: app.root.current = "register"
<Register>:
name: "register"
FloatLayout:
Label:
text:"Fill the following information to log in"
font_size: 15
italic:True
TextInput:
text:"account"
multiline = False
pos = 300,500
TextInput:
text:"password"
multiline = False
pos = 300,700
Button:
text:"Enter"
on_release:app.root.current = "login"
运行报错：
if current_property[:3] == 'on_':
TypeError: 'NoneType' object is not subscriptable 说是类型错误，实在没有找出错哪了
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