从新窗口返回到主窗口

【问题标题】：Going back from new window to main window从新窗口返回到主窗口
【发布时间】：2020-07-30 12:14:07
【问题描述】：

我有 2 个窗口，MainScreen 和 AddFW。 每当我从 MainScreen -> AddFW 转到时，它都会起作用（MainScreen 隐藏并且 AddFW 出现）。 但是，当我尝试从 AddFW 返回到 MainScreen 时，窗口崩溃并出现错误：“NameError: name 'AddFW' is not defined”。

我做错了什么？

MainScreen.py

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QMainWindow, QLineEdit, QPushButton
from PyQt5 import *
from PyQt5 import QtGui
from AddFW import *
import pyodbc

server = '**'
database = '**'
username = '**'
password = '**'
conn = pyodbc.connect('DRIVER={**};'
                      'SERVER=' + server + ';'
                                           'DATABASE=' + database + ';'
                                                                    'UID=' + username + ';'
                                                                                        'PWD=' + password)


class Ui_MainWindow(object):
    def OpenAddFW(self):
        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_AddFW()
        self.ui.setupUi(self.window)
        self.window.show()
        MainWindow.hide()

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(1000, 600)
        palette = QtGui.QPalette()
        brush = QtGui.QBrush(QtGui.QColor(255, 0, 127))
        brush.setStyle(QtCore.Qt.SolidPattern)
        palette.setBrush(QtGui.QPalette.Active, QtGui.QPalette.Text, brush)
        brush = QtGui.QBrush(QtGui.QColor(255, 0, 127))
        brush.setStyle(QtCore.Qt.SolidPattern)
        palette.setBrush(QtGui.QPalette.Inactive, QtGui.QPalette.Text, brush)
        brush = QtGui.QBrush(QtGui.QColor(120, 120, 120))
        brush.setStyle(QtCore.Qt.SolidPattern)
        palette.setBrush(QtGui.QPalette.Disabled, QtGui.QPalette.Text, brush)
        MainWindow.setPalette(palette)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(410, 40, 201, 41))
        font = QtGui.QFont()
        font.setFamily("Imprint MT Shadow")
        font.setPointSize(27)
        font.setBold(False)
        font.setUnderline(True)
        font.setWeight(50)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.InsertResultsBtn = QtWidgets.QPushButton(self.centralwidget)
        self.InsertResultsBtn.setGeometry(QtCore.QRect(58, 226, 160, 130))
        font = QtGui.QFont()
        font.setPointSize(11)
        font.setBold(True)
        font.setWeight(75)
        self.InsertResultsBtn.setFont(font)
        self.InsertResultsBtn.setObjectName("InsertResultsBtn")
        self.SearchResultsBtn = QtWidgets.QPushButton(self.centralwidget)
        self.SearchResultsBtn.setGeometry(QtCore.QRect(300, 226, 160, 130))
        font = QtGui.QFont()
        font.setPointSize(11)
        font.setBold(True)
        font.setWeight(75)
        self.SearchResultsBtn.setFont(font)
        self.SearchResultsBtn.setObjectName("SearchResultsBtn")
        self.CompareResultsBtn = QtWidgets.QPushButton(self.centralwidget)
        self.CompareResultsBtn.setGeometry(QtCore.QRect(541, 226, 160, 130))
        font = QtGui.QFont()
        font.setPointSize(11)
        font.setBold(True)
        font.setWeight(75)
        self.CompareResultsBtn.setFont(font)
        self.CompareResultsBtn.setObjectName("CompareResultsBtn")
        self.AddFWBtn = QtWidgets.QPushButton(self.centralwidget)
        self.AddFWBtn.setGeometry(QtCore.QRect(783, 226, 160, 130))
        font = QtGui.QFont()
        font.setPointSize(11)
        font.setBold(True)
        font.setWeight(75)
        self.AddFWBtn.setFont(font)
        self.AddFWBtn.setObjectName("AddFWBtn")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setEnabled(True)
        self.label_2.setGeometry(QtCore.QRect(420, 540, 181, 16))
        palette = QtGui.QPalette()
        brush = QtGui.QBrush(QtGui.QColor(255, 0, 127))
        brush.setStyle(QtCore.Qt.SolidPattern)
        palette.setBrush(QtGui.QPalette.Active, QtGui.QPalette.Text, brush)
        brush = QtGui.QBrush(QtGui.QColor(255, 0, 127))
        brush.setStyle(QtCore.Qt.SolidPattern)
        palette.setBrush(QtGui.QPalette.Inactive, QtGui.QPalette.Text, brush)
        brush = QtGui.QBrush(QtGui.QColor(120, 120, 120))
        brush.setStyle(QtCore.Qt.SolidPattern)
        palette.setBrush(QtGui.QPalette.Disabled, QtGui.QPalette.Text, brush)
        self.label_2.setPalette(palette)
        self.label_2.setObjectName("label_2")
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        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", "TestTrack"))
        self.InsertResultsBtn.setText(_translate("MainWindow", "Insert Results"))
        self.SearchResultsBtn.setText(_translate("MainWindow", "Search Results"))
        self.CompareResultsBtn.setText(_translate("MainWindow", "Compare Results"))
        self.AddFWBtn.setText(_translate("MainWindow", "Add Firmware"))
        self.label_2.setText(_translate("MainWindow", "George Hanna & Nadav Benun"))
        self.AddFWBtn.clicked.connect(self.OpenAddFW)


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_())

添加FW

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QMainWindow, QLineEdit
from PyQt5 import *
from PyQt5 import QtGui
from MainScreen import *
import pyodbc

server = '**'
database = '**'
username = '**'
password = '**'
conn = pyodbc.connect('DRIVER={**};'
                      'SERVER=' + server + ';'
                                           'DATABASE=' + database + ';'
                                                                    'UID=' + username + ';'
                                                                                        'PWD=' + password)


def create(conn2, AddToDataBase):
    cursor = conn2.cursor()
    cursor.execute('insert into dbo.Firmware(Firmware) values(?);', AddToDataBase)
    conn2.commit()
    print('Added!')

class Ui_AddFW(object):
    def AddFWFunc(self):
        create(conn, self.FirmwareInsert.text())

    def BackToMain(self):
        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self.window)
        self.window.show()
        AddFW.hide()

    def setupUi(self, AddFW):
        AddFW.setObjectName("AddFW")
        AddFW.resize(1000, 600)
        self.centralwidget = QtWidgets.QWidget(AddFW)
        self.centralwidget.setObjectName("centralwidget")
        self.AddFWButton = QtWidgets.QPushButton(self.centralwidget)
        self.AddFWButton.setGeometry(QtCore.QRect(470, 260, 121, 28))
        self.AddFWButton.setObjectName("AddFWButton")
        self.Back = QtWidgets.QPushButton(self.centralwidget)
        self.Back.setGeometry(QtCore.QRect(40, 40, 51, 28))
        self.Back.setObjectName("Back")
        self.FirmwareLabel = QtWidgets.QLabel(self.centralwidget)
        self.FirmwareLabel.setGeometry(QtCore.QRect(320, 170, 60, 16))
        self.FirmwareLabel.setObjectName("FirmwareLabel")
        self.Title = QtWidgets.QLabel(self.centralwidget)
        self.Title.setGeometry(QtCore.QRect(370, 50, 321, 16))
        font = QtGui.QFont()
        font.setPointSize(12)
        font.setBold(True)
        font.setWeight(75)
        self.Title.setFont(font)
        self.Title.setObjectName("Title")
        self.FirmwareInsert = QtWidgets.QLineEdit(self.centralwidget)
        self.FirmwareInsert.setGeometry(QtCore.QRect(400, 160, 281, 31))
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.FirmwareInsert.sizePolicy().hasHeightForWidth())
        self.FirmwareInsert.setSizePolicy(sizePolicy)
        self.FirmwareInsert.setObjectName("FirmwareInsert")
        AddFW.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(AddFW)
        self.statusbar.setObjectName("statusbar")
        AddFW.setStatusBar(self.statusbar)
        self.retranslateUi(AddFW)
        QtCore.QMetaObject.connectSlotsByName(AddFW)

    def retranslateUi(self, AddFW):
        _translate = QtCore.QCoreApplication.translate
        AddFW.setWindowTitle(_translate("AddFW", "MainWindow"))
        self.AddFWButton.setText(_translate("AddFW", "Insert to DataBase"))
        self.Back.setText(_translate("AddFW", "Back"))
        self.FirmwareLabel.setText(_translate("AddFW", "Firmware:"))
        self.Title.setText(_translate("AddFW", "Add Firmware to the DataBase"))
        self.AddFWButton.clicked.connect(self.AddFWFunc)
        self.Back.clicked.connect(self.BackToMain)


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

【问题讨论】：

    标签： python pycharm pyqt5 qt-designer


    【解决方案1】：

    这是因为 Add_FW 仅存在于 setupUi 和 retranslateUi 方法中。它在 MainWindow 中有效，因为您在下面声明它

    if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow() <- HERE
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

    一种快速解决方法是通过这种方式连接传递 AddFW 对象：

    self.Back.clicked.connect(lambda: self.BackToMain(AddFW))

    但更好的处理方法是在 Ui_AddFW 和 Ui_MainWindow 类中继承 QMainWindow，因为它们都成为 QMainWindow 的实例，并且您在实例化它时不必传递 QMainWindow。 看看这个：PyQt class inheritance

    最后，

    我建议不要在每个对象中显示和隐藏屏幕，而是创建一个 main.py 并以这种方式处理显示/隐藏逻辑：

    main.py

    from AddFW import Ui_AddFW
from MainScreen import Ui_MainWindow


def handle_back_to_main():
    add_fw.hide()
    main_screen.show()

def handle_back_to_add_fw():
    main_screen.hide()
    add_fw.show()

add_fw =  Ui_AddFW()
main_screen = Ui_MainWindow()
add_fw.Back.clicked.connect(handle_back_to_main)
main_screen.AddFWBtn.clicked.connect(handle_back_to_add_fw)

    【讨论】：

    • 我试试，非常感谢！
    • 没问题。让我知道这是否有帮助
    • 我尝试了 self.Back.clicked.connect(lambda: self.BackToMain(AddFW)) 解决方案，但它不起作用，我收到错误：TypeError: reduce expected at least 2 arguments ，得到 1 个
    • 问题是我对Python几乎一无所知，我只是在看教程来帮助我制作一个工作项目。我需要帮助:)
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