PyQt5 development notes, how to achieve the program startup screen and exit prompt?

Program launch screen: if _ _ name__ = "_ _ main__": ui_style = UIStyle (). Get_style () app = QtWidgets.QApplication (sys.argv) # create QSplashScreen object instance splash = QtWidgets.QSplashScreen ("UserView/logo.png") # set the font splash.setFont of the text in the screen (QFont ('Microsoft YaHei UI') 12) # display screen splash.show () # display information splash.showMessage ("starting. 0%", QtCore.Qt.AlignLeft | QtCore.Qt.AlignBottom, QtCore.Qt.white) time.sleep (1) splash.showMessage ("loading style sheet .20%", QtCore.Qt.AlignLeft | QtCore.Qt.AlignBottom QtCore.Qt.white) if (ui_style=='dark'): app.setStyleSheet (qdarkstyle.load_stylesheet_pyqt5 ()) time.sleep (1) splash.showMessage ("loading stylesheet .40%", QtCore.Qt.AlignLeft | QtCore.Qt.AlignBottom, QtCore.Qt.white) time.sleep (1) splash.showMessage ("loading database configuration .60%", QtCore.Qt.AlignLeft | QtCore.Qt.AlignBottom QtCore.Qt.white) time.sleep (1) splash.showMessage ("testing database connection. 80%", QtCore.Qt.AlignLeft | QtCore.Qt.AlignBottom, QtCore.Qt.white) conn = GetMysqlConnection (). Get_connection () if (connexion 0): conn.close () splash.showMessage ("testing database connection. Success", QtCore.Qt.AlignLeft | QtCore.Qt.AlignBottom QtCore.Qt.white) else: splash.showMessage ("testing database connection. Faild", QtCore.Qt.AlignLeft | QtCore.Qt.AlignBottom, QtCore.Qt.white) time.sleep (2) splash.showMessage ("starting .100%", QtCore.Qt.AlignLeft | QtCore.Qt.AlignBottom QtCore.Qt.white) time.sleep (2) ui = MainWindow () ui.show () # destroy the splash screen splash.finish (ui) sys.exit (app.exec_ ()) when the main interface is displayed

Program exit prompt # implement this function def closeEvent (self, QCloseEvent): # use QMessageBox prompt reply = QMessageBox.warning (self, "warm prompt", "exit soon, are you sure?" , QMessageBox.Yes | QMessageBox.No, QMessageBox.No) if (reply== QMessageBox.Yes): QCloseEvent.accept () if (reply==QMessageBox.No): QCloseEvent.ignore ()