How To Use Multiple .ui Files In The Main Python File

i have two .ui files that converted to python using pyuic5. first converted ui file is (LoginWindowUI.py) as below: from PyQt5 import QtCore, QtGui, QtWidgets class Ui_LoginWindow

Solution 1:

You have the following errors:

• There can only be one object of the QApplication, you are creating one for each window and that is incorrect.

• Avoid using global variables, they are considered a bad practice and few cases are necessary. For more information read: Why are global variables evil?

• Qt Designer does not offer a widget but a class that serves to fill a widget so PyQt recommend to create a suitable widget class and fill it with that class, for more information read: http://pyqt.sourceforge.net/Docs/PyQt5/designer.html

Going to the point, you can not use a flag because the process is asynchronous, in Qt you work with signals, that's the correct way to inform that there is a change, for example a way to keep the classes separate is to create a signal that indicates that you have logged in, close the window and open the other window.

from LoginWindowUI import Ui_LoginWindow
from MainWindowUI import Ui_MainWindow
from PyQt5 import QtCore, QtGui, QtWidgets


class Main_Window(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(Main_Window, self).__init__(parent)
        self.setupUi(self)

class LoginWindow(QtWidgets.QMainWindow, Ui_LoginWindow):
    logged = QtCore.pyqtSignal()

    def __init__(self, parent=None):
        super(LoginWindow, self).__init__(parent)
        self.setupUi(self)
        self.login_btn.clicked.connect(self.authenticate)

    @QtCore.pyqtSlot()
    def authenticate(self):
        db_user = self.username_ldt.text()
        db_pass = self.password_ldt.text()
        if db_user == 'admin' and db_pass=='admin':
            self.logged.emit()
            self.close()

def main():
    import sys

    app = QtWidgets.QApplication(sys.argv)
    login = LoginWindow()
    w = Main_Window()
    login.logged.connect(w.show)
    login.show()
    sys.exit(app.exec_())


if __name__ == '__main__': main()