AttributeError：“ Ui_MainWindow”对象没有属性“ setCentralWidget”

Question

我仍在为数据库使用GUI，现在出现了另一个错误：

Traceback (most recent call last):
  File "G:\Python\Database Kast Thuis\PyQt Test\MainMenu_ui.py", line 84, in <module>
    ex = Ui_MainWindow()
  File "G:\Python\Database Kast Thuis\PyQt Test\MainMenu_ui.py", line 16, in __init__
    self.setupUi(self)
  File "G:\Python\Database Kast Thuis\PyQt Test\MainMenu_ui.py", line 55, in setupUi
    MainWindow.setCentralWidget(self.centralwidget)
AttributeError: 'Ui_MainWindow' object has no attribute 'setCentralWidget'

我不了解有关PyQt的信息，所以我不了解问题所在。

代码是：（这是编辑版本，原始版本发布在下面）

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'Main_Menu.ui'
#
# Created by: PyQt5 UI code generator 5.5.1
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow
import sys

class Ui_MainWindow(QtWidgets.QWidget):
    def __init__(self):
        QtWidgets.QWidget.__init__(self)
        self.setupUi(self)

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(387, 317)
        icon = QtGui.QIcon()
        icon.addPixmap(QtGui.QPixmap("C:/Users/Natan Samuel Geldorp.Remytop-PC/Documents/music-note-sound-256.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        MainWindow.setWindowIcon(icon)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.gridLayout = QtWidgets.QGridLayout()
        self.gridLayout.setObjectName("gridLayout")
        self.ButtonRemove = QtWidgets.QPushButton(self.centralwidget)
        self.ButtonRemove.setObjectName("ButtonRemove")
        self.gridLayout.addWidget(self.ButtonRemove, 10, 0, 1, 1)
        self.ButtonShowAll = QtWidgets.QPushButton(self.centralwidget)
        self.ButtonShowAll.setObjectName("ButtonShowAll")
        self.gridLayout.addWidget(self.ButtonShowAll, 7, 0, 1, 1)
        self.ButtonShowSpecific = QtWidgets.QPushButton(self.centralwidget)
        self.ButtonShowSpecific.setObjectName("ButtonShowSpecific")
        self.gridLayout.addWidget(self.ButtonShowSpecific, 8, 0, 1, 1)
        self.Text = QtWidgets.QLabel(self.centralwidget)
        self.Text.setObjectName("Text")
        self.gridLayout.addWidget(self.Text, 1, 0, 1, 1)
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setObjectName("label")
        self.gridLayout.addWidget(self.label, 3, 0, 1, 1)
        self.ButtonAdd = QtWidgets.QPushButton(self.centralwidget)
        self.ButtonAdd.setObjectName("ButtonAdd")
        self.gridLayout.addWidget(self.ButtonAdd, 9, 0, 1, 1)
        self.ButtonExit = QtWidgets.QPushButton(self.centralwidget)
        self.ButtonExit.setObjectName("ButtonExit")
        self.gridLayout.addWidget(self.ButtonExit, 4, 0, 1, 1)
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setObjectName("label_2")
        self.gridLayout.addWidget(self.label_2, 2, 0, 1, 1)
        self.verticalLayout.addLayout(self.gridLayout)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 387, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        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", "Main Menu"))
        self.ButtonRemove.setText(_translate("MainWindow", "Remove an album"))
        self.ButtonShowAll.setText(_translate("MainWindow", "Show all registerd albums"))
        self.ButtonShowSpecific.setText(_translate("MainWindow", "Show a specific album"))
        self.Text.setText(_translate("MainWindow", "Welcome to the MusicDatabase Version 2.1-2017"))
        self.label.setText(_translate("MainWindow", "Please select one of the options below."))
        self.ButtonAdd.setText(_translate("MainWindow", "Add an album"))
        self.ButtonExit.setText(_translate("MainWindow", "Exit"))
        self.label_2.setText(_translate("MainWindow", "Authors: N.S. Geldorp & H. Nahumury"))
        self.ButtonExit.clicked.connect(self.ButtonExit)

    def ButtonExit(self):
        exit()
if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    ex = Ui_MainWindow()
    ex.show()
    sys.exit(app.exec_())

有人看到这个问题吗？

-纳坦

过帐原始转换：

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'Main_Menu.ui'
#
# Created by: PyQt5 UI code generator 5.5.1
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(387, 317)
        icon = QtGui.QIcon()
        icon.addPixmap(QtGui.QPixmap("C:/Users/Natan Samuel Geldorp.Remytop-PC/Documents/music-note-sound-256.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        MainWindow.setWindowIcon(icon)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.gridLayout = QtWidgets.QGridLayout()
        self.gridLayout.setObjectName("gridLayout")
        self.ButtonRemove = QtWidgets.QPushButton(self.centralwidget)
        self.ButtonRemove.setObjectName("ButtonRemove")
        self.gridLayout.addWidget(self.ButtonRemove, 10, 0, 1, 1)
        self.ButtonShowAll = QtWidgets.QPushButton(self.centralwidget)
        self.ButtonShowAll.setObjectName("ButtonShowAll")
        self.gridLayout.addWidget(self.ButtonShowAll, 7, 0, 1, 1)
        self.ButtonShowSpecific = QtWidgets.QPushButton(self.centralwidget)
        self.ButtonShowSpecific.setObjectName("ButtonShowSpecific")
        self.gridLayout.addWidget(self.ButtonShowSpecific, 8, 0, 1, 1)
        self.Text = QtWidgets.QLabel(self.centralwidget)
        self.Text.setObjectName("Text")
        self.gridLayout.addWidget(self.Text, 1, 0, 1, 1)
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setObjectName("label")
        self.gridLayout.addWidget(self.label, 3, 0, 1, 1)
        self.ButtonAdd = QtWidgets.QPushButton(self.centralwidget)
        self.ButtonAdd.setObjectName("ButtonAdd")
        self.gridLayout.addWidget(self.ButtonAdd, 9, 0, 1, 1)
        self.ButtonExit = QtWidgets.QPushButton(self.centralwidget)
        self.ButtonExit.setObjectName("ButtonExit")
        self.gridLayout.addWidget(self.ButtonExit, 4, 0, 1, 1)
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setObjectName("label_2")
        self.gridLayout.addWidget(self.label_2, 2, 0, 1, 1)
        self.verticalLayout.addLayout(self.gridLayout)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 387, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        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", "Main Menu"))
        self.ButtonRemove.setText(_translate("MainWindow", "Remove an album"))
        self.ButtonShowAll.setText(_translate("MainWindow", "Show all registerd albums"))
        self.ButtonShowSpecific.setText(_translate("MainWindow", "Show a specific album"))
        self.Text.setText(_translate("MainWindow", "Welcome to the MusicDatabase Version 2.1-2017"))
        self.label.setText(_translate("MainWindow", "Please select one of the options below."))
        self.ButtonAdd.setText(_translate("MainWindow", "Add an album"))
        self.ButtonExit.setText(_translate("MainWindow", "Exit"))
        self.label_2.setText(_translate("MainWindow", "Authors: N.S. Geldorp & H. Nahumury"))

Answer 1

Qt Designer用于生成视图的设计，pyuic5将该设计转换为python代码，该元素必须与逻辑一起使用，此外建议不要对其进行修改。

第一个解决方案：

import sys

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

第二种解决方案：

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


import sys

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

第三种解决方案：

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



import sys

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())