AttributeError：QDialog对象没有属性setCentralWidget

AttributeError：QDialog对象没有属性setCentralWidget

使用qt-designer时，可以选择要设计的小部件的类型：

例如，您选择了一个主窗口，因此必须使用QMainWindow来实现它。

## Created by: PyQt5 UI pre generator 5.7## WARNING! All changes made in this file will be lost!import sysfrom PyQt5 import QtCore, QtGui, QtWidgetsfrom PyQt5.QtWidgets import QApplication, QMainWindowclass Ui_ImageDialog(object):    def setupUi(self, MainWindow):        MainWindow.setObjectName("MainWindow")        MainWindow.resize(800, 600)        self.centralwidget = QtWidgets.QWidget(MainWindow)        self.centralwidget.setObjectName("centralwidget")        self.pushButton = QtWidgets.QPushButton(self.centralwidget)        self.pushButton.setGeometry(QtCore.QRect(160, 200, 191, 151))        self.pushButton.setObjectName("pushButton")        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)        self.pushButton_2.setGeometry(QtCore.QRect(450, 200, 191, 151))        self.pushButton_2.setObjectName("pushButton_2")        self.label = QtWidgets.QLabel(self.centralwidget)        self.label.setGeometry(QtCore.QRect(150, 70, 501, 101))        palette = QtGui.QPalette()        brush = QtGui.QBrush(QtGui.QColor(255, 0, 255))        brush.setStyle(QtCore.Qt.SolidPattern)        palette.setBrush(QtGui.QPalette.Active, QtGui.QPalette.WindowText, brush)        brush = QtGui.QBrush(QtGui.QColor(255, 0, 255))        brush.setStyle(QtCore.Qt.SolidPattern)        palette.setBrush(QtGui.QPalette.Inactive, QtGui.QPalette.WindowText, brush)        brush = QtGui.QBrush(QtGui.QColor(127, 127, 127))        brush.setStyle(QtCore.Qt.SolidPattern)        palette.setBrush(QtGui.QPalette.Disabled, QtGui.QPalette.WindowText, brush)        self.label.setPalette(palette)        font = QtGui.QFont()        font.setPointSize(72)        self.label.setFont(font)        self.label.setLayoutDirection(QtCore.Qt.LeftToRight)        self.label.setObjectName("label")        MainWindow.setCentralWidget(self.centralwidget)        self.menubar = QtWidgets.QMenuBar(MainWindow)        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 22))        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", "MainWindow"))        self.pushButton.setText(_translate("MainWindow", "Open Input File:"))        self.pushButton_2.setText(_translate("MainWindow", "Run"))        self.label.setText(_translate("MainWindow", "Happy Scraping"))app = QApplication(sys.argv)window = QMainWindow()ui = Ui_ImageDialog()ui.setupUi(window)window.show()sys.exit(app.exec_())

如果要实现QDialog，则必须选择某些Dialog（底部带按钮的对话框，右侧带按钮的对话框或不含按钮的对话框）。