how to use app.root.current in kivy from main file-CodePudding

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. Here is the code for the same: Main file:

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()

Code for kivy file:

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'

In point - 1 i want it to work after the login credentials are verified. I am stuck in this thing can anyone please help in finding the method for this to work. It will be highly appreciated. Thanks in advance

CodePudding user response：

It's hard to guess the actual problem without recreating it. Nonetheless based on your query:

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...

and the fact that you want to do it from a Screen, I believe the following change should work,

Replace app.root.current='quiz' with self.manager.current='quiz'.