如何在主文件中的kivy中使用app.root.current

Question

我想在我们的登录详细信息通过验证后使用 'app.root.current' 转移到另一个 window。我想在 python 的主文件中实现它。这是相同的代码：主文件：

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.factory import Factory

class SigninWindow(Screen):
    def signin(self):
        db=open('QuizLoginData.txt','r')
        usernam=self.ids.username.text
        passw=self.ids.passw0.text
        popup=Factory.MyPopup()
        una=[]
        pas=[]
        for i in db:
            a,b=i.split(', ')
            b=b.strip()
            una.append(a)
            pas.append(b)
        data=dict(zip(una,pas))
        if usernam in data:
            if passw==data[usernam]:
                popup.ids.message.text = '''Login successful'''
                popup.open()
                app.root.current='quiz' #i want to switch screens after the requirement is satisfied
            else:
                popup.ids.message.text = '''Password Doesn't match'''
                popup.open()
                self.ids.passw0.text = ''
        else:
            popup.ids.message.text = '''Username doesn't exist'''
            popup.open()
            self.ids.username.text = ''
kv = Builder.load_file('loginLayoutCSS.kv')

class Login(App):
    def build(self):
        return kv

if __name__=='__main__':
    Login().run()

kivy 文件代码：

QuizScreenManager:
    SigninWindow:
    QuizWindow:

<SigninWindow>:
    name:'signin'
    BoxLayout:
        orientation:'vertical'
        padding:20
        spacing:15
        

        Label:
            text:'Login'
            id:loginHead
            font_size:32
            pos_hint:{'center_x':0.5}

        GridLayout:
            rols:2
            cols:2
            spacing:10

            Label:
                text:'Username'
            TextInput:
                multiline:False
                id:username
                hint_text:'username'
            Label:
                text:'Password'
            PassTextInput:
                multiline:False
                id:passw0
                hint_text:'password'

        SignButton:
            text:'Sign in'
            id:signin
            on_release:
                root.signin()
                # (point - 1)app.root.current='quiz' #it should only work after certain conditions are met
<QuizWindow>:
    name:'quiz'
    Button:
        text:'Start'

要点 - 1 我希望它在验证登录凭据后工作。我被困在这件事上，任何人都可以帮助找到这个工作的方法。我们将不胜感激。提前致谢

Answer 1

如果不重现问题，很难猜出实际问题。尽管如此，根据您的查询：

I want to use 'app.root.current' to shift to another window after our login details are verified. I want to implement it in main file of python...

而且您想从 Screen 执行此操作，我相信以下更改应该有效，

将 app.root.current='quiz' 替换为 self.manager.current='quiz'。

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