AttributeError：'MyMainWindow'对象没有属性'pushButton'

Question

尝试在我的代码中继续单击按钮事件，但出现了一些问题。

AttributeError: 'MyMainWindow' object has no attribute 'pushButton'

好像单击事件一样，无法从我的子类中找到按钮。可能我在语法上犯了一些错误，因此请耐心等待您的帮助。很抱歉，如果这个问题很平庸，那么pyQt5对我来说只是新的，试图解决所有这些问题。

这是我的文件。

ui_main.py

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

# Form implementation generated from reading ui file '1.ui'
#
# Created by: PyQt5 UI code generator 5.7.1
#
# 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(349, 131)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.formLayout = QtWidgets.QFormLayout()
        self.formLayout.setObjectName("formLayout")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setAlignment(QtCore.Qt.AlignHCenter|QtCore.Qt.AlignTop)
        self.lineEdit.setObjectName("lineEdit")
        self.formLayout.setWidget(1, QtWidgets.QFormLayout.SpanningRole, self.lineEdit)
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.formLayout.setWidget(0, QtWidgets.QFormLayout.SpanningRole, self.label)
        self.gridLayout.addLayout(self.formLayout, 0, 0, 1, 1)
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.horizontalLayout.addWidget(self.pushButton)
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setObjectName("pushButton_2")
        self.horizontalLayout.addWidget(self.pushButton_2)
        self.gridLayout.addLayout(self.horizontalLayout, 1, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 349, 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", "MainWindow"))
        self.label.setText(_translate("MainWindow", "TextLabel"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))
        self.pushButton_2.setText(_translate("MainWindow", "PushButton"))


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_())

py_main.py

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, qApp
from PyQt5.QtCore import Qt, QEvent, QObject
from ui_main import Ui_MainWindow


class MyMainWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MyMainWindow, self).__init__(parent)
        qApp.installEventFilter(self)
        self.pushButton.clicked.connect(self.clickButton()) #here is where the issue is occurs
        self.show()
        self.setupUi(self)

    def eventFilter(self, obj, event):
        if event.type() == QEvent.KeyPress:
            if event.key() == Qt.Key_Escape:
                self.close()
        return super(MyMainWindow, self).eventFilter(obj, event)

    def clickButton(self):
        sender = self.sender()
        self.statusbar().showMessage(sender.text() + ' was pressed')

if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = MyMainWindow()
    test = TestClass()
    sys.exit(app.exec_())

等待您的帮助！

Answer 1

在您的代码中有3个错误：

1. setupUI由于按钮是在此处创建的，因此必须首先调用该函数，然后将该按钮连接到插槽。
2. 当按钮连接到插槽时，您只需要传递插槽名称而无需括号。
3. 更改statusbar()为statusBar()。

码：

# ...
class MyMainWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MyMainWindow, self).__init__(parent)
        qApp.installEventFilter(self)
        self.setupUi(self)
        self.pushButton.clicked.connect(self.clickButton)
        self.show()
# ...
    def clickButton(self):
        sender = self.sender()
        self.statusBar().showMessage(sender.text() + ' was pressed')
# ...