from PyQt6.QtWidgets import QApplication, QMainWindow

from PyQt6 import uic

import sys

class Login(QMainWindow):

    def __init__(self):

        super().__init__()

        uic.loadUi("gui/login.ui", self)

class Register(QMainWindow):

    def __init__(self):

        super().__init__()

        uic.loadUi("gui/register.ui", self)

if __name__ == '__main__':

    app = QApplication(sys.argv)

    login = Login()

    login.show()

    app.exec()

from PyQt6.QtCore import Qt

from PyQt6.QtWidgets import QApplication, QMainWindow, QMessageBox, QWidget

from PyQt6 import uic

import sys 

class Login(QMainWindow):

    def __init__(self):

        super().__init__()

        uic.loadUi("gui/login.ui", self)

        self.btnRegister.clicked.connect(self.show_register)

        self.btnLogin.clicked.connect(self.check_login)

        self.msg_box = QMessageBox()

    def check_login(self):

        email = self.txtEmail.text()

        password = self.txtPassword.text()

        if email == "admin@example.com" and password == "admin":

            main.show()

            self.close()

        else:

            self.msg_box.setText("Vui lòng nhập kiểm tra lại thông tin đăng nhập")

            self.msg_box.setIcon(QMessageBox.Icon.Warning)

            self.msg_box.exec()

    def show_register(self):

        register.show()

        self.close()

class Register(QMainWindow):

    def __init__(self):

        super().__init__()

        uic.loadUi("gui/register.ui", self)

        self.btnLogin.clicked.connect(self.show_login)

        self.msg_box = QMessageBox()

    def show_login(self):

        login.show()

        self.close()

class Main(QMainWindow):

    def __init__(self) :

        super().__init__()

        uic.loadUi("gui/main.ui")

if __name__ == '__main__':

    app = QApplication(sys.argv)

    login = Login()

    login.show()

    register = Register()

    main = Main()

    app.exec() 

from PyQt6.QtCore import Qt

from PyQt6.QtWidgets import QApplication, QMainWindow, QMessageBox, QWidget

from PyQt6 import uic

import sys 

class Login(QMainWindow):

    def __init__(self):

        super().__init__()

        uic.loadUi("gui/login.ui", self)

        self.btnRegister.clicked.connect(self.show_register)

        self.btnLogin.clicked.connect(self.check_login)

        self.msg_box = QMessageBox()

    def check_login(self):

        email = self.txtEmail.text()

        password = self.txtPassword.text()

        if email == "admin@example.com" and password == "admin":

            main.show()

            self.close()

        else:

            self.msg_box.setText("Vui lòng nhập kiểm tra lại thông tin đăng nhập")

            self.msg_box.setIcon(QMessageBox.Icon.Warning)

            self.msg_box.exec()

    def show_register(self):

        register.show()

        self.close()

class Register(QMainWindow):

    def __init__(self):

        super().__init__()

        uic.loadUi("gui/register.ui", self)

        self.btnLogin.clicked.connect(self.show_login)

        self.msg_box = QMessageBox()

    def show_login(self):

        login.show()

        self.close()

class Main(QMainWindow):

    def __init__(self) :

        super().__init__()

        uic.loadUi("gui/main.ui", self)

if __name__ == '__main__':

    app = QApplication(sys.argv)

    login = Login()

    login.show()

    register = Register()

    main = Main()

    app.exec()