我正在尝试构建一个可以计算两个值之和的应用。我有一个名为Therdwindow的屏幕，其中有三个文本输入小部件。
from kivy.app import App
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.scatter import Scatter
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.textinput import TextInput
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen`
class MainWindow(Screen):
pass
class SecondWindow(Screen):
pass
class Therdwindow(Screen):
pass
class Fourwindow(Screen):
pass
class FunfthWindow(Screen):
def calculate3(self,bibi,mimi):
kiki = str(float(bibi) + float(mimi))
if kiki:
try :
self.result_1.text = str(eval(kiki))
except Exception:
self.result_1.text = 'Error'
class Sixwindow(Screen):
pass
class WindowManager(ScreenManager):
psss
kv = Builder.load_file("layout.kv")
class MyMainApp(App):
def build(self):
return kv
if __name__ == "__main__":
MyMainApp().run()
[一个人应该输入密码'gin'，而不是单击按钮“ NEXT”进入下一个名为SecondWindow的屏幕，然后单击按钮'NEXT'进入下一个名为TherdWindow的屏幕，
然后在“方框”中输入“第一个值”，然后单击“下一步”按钮转到下一个名为fourWindow的屏幕，而不是输入第二个Value并单击按钮“ NEXT”转到名为funfthWindow的下一个屏幕。
如果他单击按钮结果，则应该有“结果”。在此屏幕中，有一个标签应打印该人指定的总金额。
layout.kv
<CustButton@Button>:
font_size: 40
WindowManager:
MainWindow:
SecondWindow:
Therdwindow:
Fourwindow:
FunfthWindow:
Sixwindow:
<MainWindow>:
name: "main"
<MainWindow>:
name: "main"
GridLayout:
cols:1
GridLayout:
cols: 2
orientation: 'vertical'
Label:
text: "Password: "
font_size: "40sp"
background_color: (1,1,0,1)
font_name: 'RobotoMono-Regular.ttf'
TextInput:
id: passw
multiline: False
font_size: "40sp"
CustButton:
text: "Submit"
background_color: (0.8,0.8,0,1)
on_press:
app.root.current = "second" if passw.text == "gin" else "six"
root.manager.transition.duration = 1
root.manager.transition.direction = "left"
<SecondWindow>:
name: "second"
GridLayout:
cols: 1
spacing: 10
CustButton:
text: "Go Back"
on_press:
app.root.current = "main"
root.manager.transition.direction = "right"
CustButton:
text: "next"
on_press:
app.root.current = "therd"
root.manager.transition.direction = "left"
<Therdwindow>:
id:lulu
name: "therd"
nani:feras1
rows: 20
padding: 0
spacing: 2
GridLayout:
spacing: 10
cols:2
Label:
text: "Enter The First Value : "
font_size: "30sp"
TextInput:
id:first_Value
font_size: 40
multiline: True
CustButton:
text: "go back"
on_press:
app.root.current = "second"
root.manager.transition.direction = "right"
CustButton:
text: "Next"
on_press:
app.root.current = "four"
root.manager.transition.direction = "left"
<Fourwindow>:
id:lala
name: "four"
nani21:feras2
rows: 20
padding: 0
spacing: 2
GridLayout:
spacing: 10
cols:2
Label:
text: "Enter The second Value : "
font_size: "30sp"
TextInput:
id: second_Value
font_size: 40
multiline: True
CustButton:
text: "go back"
on_press:
app.root.current = "therd"
root.manager.transition.direction = "right"
CustButton:
text: "NEXT"
on_press:
app.root.current = "funfth"
root.manager.transition.direction = "left"
<FunfthWindow>:
id:CalcmGridLayout
name: "funfth"
result_1:label_id
rows: 20
padding: 0
spacing: 2
GridLayout:
spacing: 10
cols:2
CustButton:
text: "Result : "
font_size: "30sp"
on_press:CalcmGridLayout.calculate3(first_Value.text,second_Value.text)
Label:
id: label_id
font_size: 40
multiline: True
CustButton:
text: "go back"
on_press:
app.root.current = "four"
root.manager.transition.direction = "right"
CustButton:
text: "NEXT"
on_press:
app.root.current = "main"
root.manager.transition.direction = "left"
<Sixwindow>:
name: "six"
GridLayout:
cols: 1
spacing: 10
Label:
text: 'das Password ist falsch'
font_size: "40sp"
CustButton:
text: "nochmal"
on_press:
app.root.current = "main"
root.manager.transition.direction = "right"
单击“ 结果”时，出现此错误NameError : first_Value is not defined
请帮助。我真的很感谢任何建议。
嗯，有很多方法可以做到这一点，为简单起见，我将在MyMainApp类中进行所有操作：
from kivy.properties import ObjectProperty
from Kivy.clock import Clock
...
class Therdwindow(Screen):
first_Value = ObjectProperty(None)
def getvalue(self):
return self.first_Value
class Fourwindow(Screen):
second_Value = ObjectProperty(None)
def getvalue(self):
return self.second_Value
class FunfthWindow(Screen):
label_id = ObjectProperty(None)
def getlabel(self):
return self.label_id
class WindowManager(ScreenManager):
pass
class MyMainApp(App):
def build(self):
with open('layout.kv', encoding='utf-8', errors='ignore') as f:
Builder.load_string(f.read())
# creating objects of screens
self.mainwindow = MainWindow()
self.secondwindow = SecondWindow()
self.therdwindow = Therdwindow()
self.fourwindow = Fourwindow()
self.funfthwindow = FunthWindow()
# creating object of screen manager
self.sm = WindowManager()
# getting all object properties
self.first_Value = self.therdwindow.getvalue()
self.second_Value = self.fourwindow.getvalue()
self.label_id = self.funfthwindow.getlabel()
# connecting object properties to widgets from kv file
# sometimes we need to delay that, because the app can't load so quickly, so let's make a method for it
Clock.schedule_once(self.getids)
# adding screens to screen manager
self.sm.add_widget(self.mainwindow)
self.sm.add_widget(self.secondwindow)
self.sm.add_widget(self.therdwindow)
self.sm.add_widget(self.fourwindow)
self.sm.add_widget(self.funfthwindow)
# in case you want screen manager be able to work you should return it
return self.sm
def getids(self):
self.first_Value = self.therdwindow.ids.first_Value
self.second_Value = self.fourwindow.ids.second_Value
self.label_id = self.funfthwindow.ids.label_id
# method that does what you want
def count(self):
self.label_id.text = str(int(self.first_Value.text) + int(self.second_Value.text))
if __name__ == "__main__":
MyMainApp().run()
并且您需要编辑kv文件，进行所有更改
on_press:
app.root.current = "second"
至此：
on_press:
app.sm.current = "second"
并更改此：
CustButton:
text: "Result : "
font_size: "30sp"
on_press:CalcmGridLayout.calculate3(first_Value.text,second_Value.text)
至此：
CustButton:
text: "Result : "
font_size: "30sp"
on_press: app.count
并删除此：
WindowManager:
MainWindow:
SecondWindow:
Therdwindow:
Fourwindow:
FunfthWindow:
Sixwindow: