Adding Functions to Buttons via Importing PyQt5 Ui

Question

I have a PyQt5 Ui named guiNext.py and next.py which is refrencing the UI. How do I add function to the UI button? This is what I have and nothing happens when I run next.py and click on HELLO button.

guiNext.py:

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

# Form implementation generated from reading ui file 'guiNext_001.ui'
#
# Created by: PyQt5 UI code generator 5.6
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_nextGui(object):
    def setupUi(self, nextGui):
        nextGui.setObjectName("nextGui")
        nextGui.resize(201, 111)
        nextGui.setMinimumSize(QtCore.QSize(201, 111))
        nextGui.setMaximumSize(QtCore.QSize(201, 111))
        self.centralwidget = QtWidgets.QWidget(nextGui)
        self.centralwidget.setObjectName("centralwidget")
        self.helloBtn = QtWidgets.QPushButton(self.centralwidget)
        self.helloBtn.setGeometry(QtCore.QRect(10, 10, 181, 91))
        self.helloBtn.setObjectName("helloBtn")
        nextGui.setCentralWidget(self.centralwidget)

        self.retranslateUi(nextGui)
        QtCore.QMetaObject.connectSlotsByName(nextGui)

    def retranslateUi(self, nextGui):
        _translate = QtCore.QCoreApplication.translate
        nextGui.setWindowTitle(_translate("nextGui", "MainWindow"))
        self.helloBtn.setText(_translate("nextGui", "HELLO"))

and here is main file next.py:

#!usr/bin/env python
#-*- coding: utf-8 -*-

from PyQt5 import QtCore, QtGui, QtWidgets
from guiNext import Ui_nextGui

class mainProgram(Ui_nextGui):
    def __init__(self, parent=None):
        Ui_nextGui.__init__(self)
        self.setupUi(nextGui)
        self.helloBtn.clicked.connect(self.hello)

    def hello(self):
        print ("HELLO")

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

ekhumoro · Accepted Answer · 2016-11-26 16:33:42Z

7

The structure of your program is not quite right. There are several ways to use the ui files created by Qt Designer. The multiple-inheritance approach is possibly the most intuitive. This is what your code should look like:

from PyQt5 import QtCore, QtGui, QtWidgets
from guiNext import Ui_nextGui

class mainProgram(QtWidgets.QMainWindow, Ui_nextGui):
    def __init__(self, parent=None):
        super(mainProgram, self).__init__(parent)
        self.setupUi(self)
        self.helloBtn.clicked.connect(self.hello)

    def hello(self):
        print ("HELLO")

if __name__ == "__main__":

    import sys
    app = QtWidgets.QApplication(sys.argv)
    nextGui = mainProgram()
    nextGui.show()
    sys.exit(app.exec_())

answered Nov 26, 2016 at 16:33

ekhumoro

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6 Comments

Sherafati Over a year ago

Is super(mainProgram, self).__init__(parent) necessary?

ekhumoro Over a year ago

@Sherafati Yes - otherwise QMainWindow would not be initialised properly. However, in Python 3 it can be simplified to super().__init__(parent).

Sherafati Over a year ago

But we you delete that expression, the program still works

ekhumoro Over a year ago

@Sherafati You must be running different code. If you delete that line in my example, it will raise an error: RuntimeError: super-class __init__() of type mainProgram was never called.

ekhumoro Over a year ago

@Sherafati Yes. If you follow the link to the pyqt docs in my answer, it shows three different ways to use the designer files. When you create an instance of QMainWindow yourself, it will automatically call its own __init__. But if you override __init__ in a subclass, the base-class __init__ must be called explicitly.

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