[Python] How can I set app icon with Qt Design Studio project?

How can I modify the icon in the upper left corner of my software and the icon displayed in the taskbar? The software was designed by Qt Design Studio, and the project was generated in 2 ways, one is CMake, and the other is qrc.

I can run the code normally in both ways. CMake uses C++ driver. Qrc is converted by python using pyside6-rcc. Python can also run, but I can't set the icon of my software. Can anyone help me solve it? The QT version used is 6.8, and the Qt Design Studio version is 4.7.0.

Below is my python code:

import sys
import os
import sys
import PySide6.QtCore
import PySide6.QtQuick
from PySide6.QtQml import QQmlApplicationEngine
from PySide6.QtWidgets import QApplication, QMessageBox
from PySide6.QtCore import QObject, Slot
from PySide6.QtGui import QIcon
from PySide6.QtGui import QGuiApplication
import UpgradeTools_rc
import serial
import serial.tools.list_ports
import ctypes

class QuickWidget(QObject):
def __init__(self):
super().__init__()
self.engine = QQmlApplicationEngine()
self.engine.rootContext().setContextProperty("backend", self)
self.engine.addImportPath(u":/qml")
self.engine.addImportPath(u":/")

self.engine.load(u":/UpgradeToolsContent/App.qml")
if not self.engine.rootObjects():
QMessageBox.critical(None, "Error", "Failed to load QML file.")
sys.exit(-1)

root_objects = self.engine.rootObjects()
if root_objects:
window = root_objects[0]
if hasattr(window, "setIcon"):
window.setIcon(QIcon(":/images/iconImage.ico"))
else:
print("this root window not support setIcon")
else:
print("not found root window")

@Slot()
def onTestButtonClicked(self):
QMessageBox.information(None, "Clicked", "You clicked the large button!")
ports = serial.tools.list_ports.comports()
for port in ports:
print(port)


if __name__ == '__main__':
app = QGuiApplication([])
iconTemp = QIcon(":/images/iconImage.ico")
if iconTemp is None:
print("Icon not found")
else:
print("Icon found")
# app.setWindowIcon(iconTemp)
quick_widget = QuickWidget()

# root_objs = quick_widget.engine.rootObjects()
# if root_objs:
# window = root_objs[0]
# if hasattr(window, "setIcon"):
# window.setIcon(iconTemp)
# print("Window icon set via root object")
# else:
# print("Window object does not support setIcon")
# else:
# print("No root window found")
app.exec()


No matter if I use app.setWindowIcon(iconTemp) or root_objs, it doesn't work, and iconTemp is prompted to load normally.

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