如何在 Pyqt5 .ui 文件中获取子菜单？

Question

I want to get the submenu That is QuitProgram <- This is name of submenu but it is in UI file.

How can I get it in a variable set its action to quit program?

File menu object name is 'actionQuit_FromProgram' <- This is a submenu.

Python File:

from PyQt5 import QtWidgets, uic
from PyQt5.QtWidgets import QFileDialog, QMenuBar
from PyQt5.QtGui import *
import sys
import os
import qdarkgraystyle
path = os.path.abspath(os.getcwd())
import qrcode

class Ui(QtWidgets.QMainWindow):
def __init__(self):
    super(Ui, self).__init__()
    uic.loadUi('main.ui', self)
    #self.show()
    self.button = self.findChild(QtWidgets.QPushButton, 'qrgenerator')
    self.button.clicked.connect(self.QrCodeGenerator) # Remember to pass the definition/method, not the return value!
    self.input = self.findChild(QtWidgets.QLineEdit, 'qredit')
    self.button1 = self.findChild(QtWidgets.QPushButton, 'qropen')
    self.button1.clicked.connect(self.OpenQRCode)
    self.menu1 = self.findChild(QMenuBar,'actionQuit_FromProgram')
    print(self.menu1)
    #self.menu1.triggered.connect(qApp.quit)
    self.show()

def QrCodeGenerator(self):
    # Generate QR code
    self.url = qrcode.make(self.qredit.text())
    if self.qredit.text() == '':
        QMessageBox.warning(self, "Error", "Please Type In Something To Generate Qr Code")
    else:
        self.url.save("filename.png","PNG")
def OpenQRCode(self):
    fname = QFileDialog.getOpenFileName(self, 'Open file', 
    path,"Image files (*.jpg *.gif *.png *.svg)")[0]
    self.label_2.setPixmap(QPixmap(fname))

app = QtWidgets.QApplication(sys.argv)
app.setStyleSheet(qdarkgraystyle.load_stylesheet())
window = Ui()
app.exec_()

Answer 1

If you're using loadUi (or setupUi if you're using files generated by pyuic), all elements in the object inspector (the tree view that lists all widgets on your UI) become available as instance attributes, according to their object name .

So, if your action is called actionQuit_FromProgram in the inspector, you can directly access it using self.actionQuit_FromProgram .

This also means that:

• all those findChild are absolutely useless: you already have access to self.qrgenerator , self.qredit , etc;
• in any case, findChild should be used with the correct class of the object you're looking for: I sincerely doubt that actionQuit_FromProgram is a QMenuBar (so, using findChild(QMenuBar, ...) won't work at all; if it is an action, use findChild(QAction, ...) ; if it's a submenu, use findChild(Qmenu, ...) ;
• there's usually just one menu bar for each QMainWindow, and it is easily accessible using self.menuBar() ;