多个gui python qt并在它们之间切换

Question

我有2个PyQt5文件-一个登录窗口和一个欢迎窗口。成功登录后，我需要弹出欢迎窗口。欢迎窗口中的按钮应该可以将我带回到登录窗口。当我按下相同按钮时，请任何人帮助我隐藏欢迎窗口。

请在下面找到代码

login.py

from PyQt5 import QtCore, QtGui, QtWidgets
import sqlite3
import os
from signup import Ui_Dialog2
from welcome import welcomeClass
os.chdir(r"C:\Users\maanto2\Desktop\qt")


class Ui_Dialog(object):

    def showMessageBox(self,title,message):
        msgBox =QtWidgets.QMessageBox()
        msgBox.setIcon(QtWidgets.QMessageBox.Warning)
        msgBox.setWindowTitle(title)
        msgBox.setText(message)
        msgBox.setStandardButtons(QtWidgets.QMessageBox.Ok)
        msgBox.exec_()

    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(428, 258)

        self.user_name = QtWidgets.QLabel(Dialog)
        self.user_name.setGeometry(QtCore.QRect(40, 50, 61, 16))
        self.user_name.setObjectName("user_name")
        self.pass_word = QtWidgets.QLabel(Dialog)
        self.pass_word.setGeometry(QtCore.QRect(40, 90, 61, 16))
        self.pass_word.setObjectName("pass_word")
        self.push_login = QtWidgets.QPushButton(Dialog)
        self.push_login.setGeometry(QtCore.QRect(150, 160, 91, 41))
        self.push_login.setObjectName("push_login")
        self.push_sign = QtWidgets.QPushButton(Dialog)
        self.push_sign.setGeometry(QtCore.QRect(270, 160, 81, 41))
        self.push_sign.setObjectName("push_sign")
        self.user_lineEdit = QtWidgets.QLineEdit(Dialog)
        self.user_lineEdit.setGeometry(QtCore.QRect(150, 50, 221, 20))
        self.user_lineEdit.setObjectName("user_lineEdit")

        #######
        self.push_login.clicked.connect(self.loginCheck)
        #######

        self.pass_lineEdit = QtWidgets.QLineEdit(Dialog)
        self.pass_lineEdit.setGeometry(QtCore.QRect(150, 90, 221, 20))
        self.pass_lineEdit.setObjectName("pass_lineEdit")
        #######
        self.push_sign.clicked.connect(self.signCheck)
        #######
        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Login Window"))
        self.user_name.setText(_translate("Dialog", "USERNAME"))
        self.pass_word.setText(_translate("Dialog", "PASSWORD"))
        self.push_login.setText(_translate("Dialog", "LOGIN"))
        self.push_sign.setText(_translate("Dialog", "SIGNUP"))

    def loginCheck(self):
        usernam=self.user_lineEdit.text()
        passwor=self.pass_lineEdit.text()
        conn = sqlite3.connect('login.db')
        crsr = conn.cursor()
        crsr.execute("SELECT * FROM users where username = '%s' and password= '%s' " %(usernam,passwor))
        result = crsr.fetchall()
        if (len(result)>0):
            print("User found")
            Dialog.close()
            self.welcomeWindow =QtWidgets.QMainWindow()
            self.ui=welcomeClass()
            self.ui.setupUi(self.welcomeWindow)
            self.welcomeWindow.show()


        else:
            print("Unauthorized Login Attempt")
            self.showMessageBox('Warning','Wrong credentials entered')
        conn.close()

    def signCheck(self):
        print("Sign clicked")
        Dialog.close()
        self.signupMe =QtWidgets.QDialog()
        self.ui=Ui_Dialog2()
        self.ui.setupUi(self.signupMe)
        self.signupMe.show()


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Dialog = QtWidgets.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())

welcome.py

from PyQt5 import QtCore, QtGui, QtWidgets

class welcomeClass(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(372, 245)
        MainWindow.setStyleSheet("background-color: rgb(0, 255, 255);")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(90, 70, 171, 91))
        font = QtGui.QFont()
        font.setPointSize(23)
        font.setBold(True)
        font.setWeight(75)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.goBack = QtWidgets.QPushButton(self.centralwidget)
        self.goBack.setGeometry(QtCore.QRect(140, 200, 75, 23))
        self.goBack.setObjectName("goBack")


        #######
        self.goBack.clicked.connect(self.goBack1)
        #######

        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "WELCOME"))
        self.goBack.setText(_translate("MainWindow", "GO BACK"))

    def goBack1(self):

        from login import Ui_Dialog
        self.loginWindow =QtWidgets.QDialog()
        self.ui=Ui_Dialog()
        self.ui.setupUi(self.loginWindow)
        self.loginWindow.show()

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

我的要求的简化示例如下。

from PyQt5 import QtCore, QtGui, QtWidgets
from pb2 import Ui_MainWindow2

class Ui_MainWindow1(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(633, 328)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pb1 = QtWidgets.QPushButton(self.centralwidget)
        self.pb1.setGeometry(QtCore.QRect(220, 110, 191, 81))
        self.pb1.setObjectName("pb1")
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        #######
        self.pb1.clicked.connect(self.signCheck1)
        #######
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pb1.setText(_translate("MainWindow", "PushButton"))

    def signCheck1(self):
        print("Sign  1 clicked")
        MainWindow.close()
        self.pb2 =QtWidgets.QMainWindow()
        self.ui=Ui_MainWindow2()
        self.ui.setupUi(self.pb2)
        self.pb2.show()


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow1()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow2(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(507, 328)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pb2 = QtWidgets.QPushButton(self.centralwidget)
        self.pb2.setGeometry(QtCore.QRect(170, 120, 211, 91))
        self.pb2.setObjectName("pb2")
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        #######
        self.pb2.clicked.connect(self.signCheck2)
        #######

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pb2.setText(_translate("MainWindow", "PushButton"))

    def signCheck2(self):
        print("Sign 2 clicked")
        from pb1 import Ui_MainWindow1
        MainWindow.close()
        self.pb1 =QtWidgets.QMainWindow()
        self.ui=Ui_MainWindow1()
        self.ui.setupUi(self.pb1)
        self.pb1.show()


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow2()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

基本上我有2个QMainWindows。

UI中的QPushButton-1将关闭UI-1并打开UI-2

UI中的QPushButton-2将关闭UI-2，然后再次打开UI-1

对不起，我错过了signup.py 请在下面找到它。 任何帮助将不胜感激。

signup.py

from PyQt5 import QtCore, QtGui, QtWidgets
import sqlite3

class Ui_Dialog2 (object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(485, 300)
        self.label = QtWidgets.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(60, 40, 91, 31))
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(Dialog)
        self.label_2.setGeometry(QtCore.QRect(60, 90, 71, 21))
        self.label_2.setObjectName("label_2")
        self.label_3 = QtWidgets.QLabel(Dialog)
        self.label_3.setGeometry(QtCore.QRect(60, 130, 71, 21))
        self.label_3.setObjectName("label_3")
        self.push_sign = QtWidgets.QPushButton(Dialog)
        self.push_sign.setGeometry(QtCore.QRect(250, 220, 131, 41))
        self.push_sign.setObjectName("push_sign")
        self.push_sign.clicked.connect(self.signUp)
        self.lineEdit = QtWidgets.QLineEdit(Dialog)
        self.lineEdit.setGeometry(QtCore.QRect(150, 50, 113, 20))
        self.lineEdit.setObjectName("lineEdit")
        self.lineEdit_2 = QtWidgets.QLineEdit(Dialog)
        self.lineEdit_2.setGeometry(QtCore.QRect(150, 90, 113, 20))
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.lineEdit_3 = QtWidgets.QLineEdit(Dialog)
        self.lineEdit_3.setGeometry(QtCore.QRect(150, 130, 311, 20))
        self.lineEdit_3.setObjectName("lineEdit_3")
        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "SIGN UP PAGE"))
        self.label.setText(_translate("Dialog", "USERNAME"))
        self.label_2.setText(_translate("Dialog", "PASSWORD"))
        self.label_3.setText(_translate("Dialog", "Email Address"))
        self.push_sign.setText(_translate("Dialog", "SIGN UP"))

    def signUp(self):
        usernam=self.lineEdit.text()
        passwor=self.lineEdit_2.text()
        email  =self.lineEdit_3.text()
        conn = sqlite3.connect('login.db')
        print ("Opened database successfully")
        conn.execute("INSERT INTO users VALUES (?,?,?)" ,(usernam,email,passwor));
        conn.commit()
        conn.close()



if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Dialog = QtWidgets.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())