pyQt5 AttributeError：'MyMainWindow'對象沒有屬性'pushButton'

Question

試圖繼續在我的代碼中點擊按鈕事件，但有一些問題。

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

看來，像點擊事件不能老是找按鈕從我的子類。可能我在語法上犯了一些錯誤，所以真的在等待你的幫助。對不起，如果問題很平庸，pyQt5對我來說只是一個新東西，試圖找出所有這一切。

這是我的文件。

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_()) 

等待着您的幫助！

Answer 1

在代碼中有3個錯誤：

1. 您必須先打電話，因爲該按鈕在這裏創建了setupUI函數，然後該按鈕連接到插槽。
2. 當按鈕連接到插槽時，您只需傳遞沒有括號的插槽名稱。
3. 變化statusbar()變爲statusBar()。

代碼：

[...] 

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') 

[...]