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https://www.bilibili.com/video/BV1tz4y1o7Yc/

案例：設計一個使用者登入介面

工具：python PyQt5

（1）初始介面

（3）切換“管理員”和“普通使用者”登入

# -*- coding: utf-8 -*-from PyQt5 import QtCore, QtGui, QtWidgetsfrom PyQt5.QtGui import QPixmap, QIconfrom PyQt5.QtWidgets import QMessageBoxclass Ui_MainWindow(object):    def setupUi(self, MainWindow):        MainWindow.setObjectName("MainWindow")        MainWindow.resize(300, 180)        self.centralwidget = QtWidgets.QWidget(MainWindow)        self.centralwidget.setObjectName("centralwidget")        self.label = QtWidgets.QLabel(self.centralwidget)        self.label.setGeometry(QtCore.QRect(60, 30, 51, 16))        self.label.setObjectName("label")        self.label_2 = QtWidgets.QLabel(self.centralwidget)        self.label_2.setGeometry(QtCore.QRect(60, 60, 51, 16))        self.label_2.setObjectName("label_2")        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)        self.lineEdit.setGeometry(QtCore.QRect(120, 30, 113, 20))        self.lineEdit.setObjectName("lineEdit")        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)        self.lineEdit_2.setGeometry(QtCore.QRect(120, 60, 113, 20))        self.lineEdit_2.setObjectName("lineEdit_2")        self.lineEdit_2.setEchoMode(QtWidgets.QLineEdit.Password)  # 設定文字框為密碼        self.lineEdit_2.setValidator(QtGui.QIntValidator(10000000,99999999))  # 設定只能輸入8位數字                self.pushButton = QtWidgets.QPushButton(self.centralwidget)        self.pushButton.setGeometry(QtCore.QRect(70, 120, 61, 27))        self.pushButton.setObjectName("pushButton")        self.pushButton.setIcon(QIcon(QPixmap("login.ico")))  # 為“登入”按鈕設定圖示        self.label = QtWidgets.QLabel(self.centralwidget)        self.label.setGeometry(QtCore.QRect(60, 30, 51, 16))        self.label.setObjectName("label")        self.label_2 = QtWidgets.QLabel(self.centralwidget)        self.label_2.setGeometry(QtCore.QRect(60, 60, 51, 16))        self.label_2.setObjectName("label_2")        self.radioButton = QtWidgets.QRadioButton(self.centralwidget)        self.radioButton.setGeometry(QtCore.QRect(70, 90, 71, 18))        self.radioButton.setObjectName("radioButton")        self.radioButton.setChecked(True)  # 設定“管理員單選按鈕預設選中        self.radioButton_2 = QtWidgets.QRadioButton(self.centralwidget)        self.radioButton_2.setGeometry(QtCore.QRect(150, 90, 81, 18))        self.radioButton_2.setObjectName("radioButton_2")        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)        self.pushButton_2.setGeometry(QtCore.QRect(160, 120, 61, 27))        self.pushButton_2.setObjectName("pushButton_2")        self.pushButton_2.setIcon(QIcon(QPixmap("exit.ico")))  # 為“退出”按鈕設定圖示        MainWindow.setCentralWidget(self.centralwidget)        self.retranslateUi(MainWindow)        self.pushButton.clicked.connect(self.login)  # 為“登入”按鈕的clicked訊號繫結自定義槽函式        self.pushButton_2.clicked.connect(MainWindow.close)  # 為“退出”按鈕的clicked訊號繫結MainWindow視窗自帶的close(）槽函式        self.radioButton.toggled.connect(self.select)  # 為單選按鈕的toggled訊號繫結自定義槽函式        self.menubar = QtWidgets.QMenuBar(MainWindow)        self.menubar.setGeometry(QtCore.QRect(0, 0, 317, 26))        self.menubar.setObjectName("menubar")        MainWindow.setMenuBar(self.menubar)        self.statusbar = QtWidgets.QStatusBar(MainWindow)        self.statusbar.setObjectName("statusbar")        MainWindow.setStatusBar(self.statusbar)        QtCore.QMetaObject.connectSlotsByName(MainWindow)    def login(self):        from PyQt5.QtWidgets import QMessageBox        # 使用information()方法彈出資訊提示框        QMessageBox.information(MainWindow, "登入資訊", "使用者名稱: " + self.lineEdit.text() +                                "  密碼:" + self.lineEdit_2.text(), QMessageBox.Ok)    # 自定義槽函式，用來判斷使用者登入身份    def select(self):        if self.radioButton.isChecked():    # 判斷是否為管理員登入            QMessageBox.information(MainWindow, "提示", "您選擇的是 管理員 登入", QMessageBox.Ok)        elif self.radioButton_2.isChecked():    # 判斷是否為普通使用者登入            QMessageBox.information(MainWindow, "提示", "您選擇的是 普通使用者  登入", QMessageBox.Ok)    def retranslateUi(self, MainWindow):        _translate = QtCore.QCoreApplication.translate        MainWindow.setWindowTitle(_translate("MainWindow", "系統登入"))        self.label.setText(_translate("MainWindow", "使用者名稱："))        self.label_2.setText(_translate("MainWindow", "密 碼："))        self.pushButton.setText(_translate("MainWindow", "登入"))        self.pushButton_2.setText(_translate("MainWindow", "退出"))        self.radioButton.setText(_translate("MainWindow", "管理員"))        self.radioButton_2.setText(_translate("MainWindow", "普通使用者"))import sysif __name__ == '__main__':    app = QtWidgets.QApplication(sys.argv)    MainWindow = QtWidgets.QMainWindow()    ui = Ui_MainWindow()    ui.setupUi(MainWindow)    MainWindow.show()    sys.exit(app.exec_())