pyqt5 setWindowTitle 设置窗口标题失效解决办法

myMainWindow = QMainWindow()
myUi = wMain.Ui_MainWindow()
myUi.setupUi(myMainWindow)
myMainWindow.setWindowTitle('ZDEMViewer    离散元数值模拟可视化程序')
myMainWindow.setWindowIcon(QIcon("./icons/logo.ico"))
myMainWindow.show()

如上所示的设置顺序可以成功

如果是:

myMainWindow = QMainWindow()
myMainWindow.setWindowTitle('ZDEMViewer    离散元数值模拟可视化程序')
myMainWindow.setWindowIcon(QIcon("./icons/logo.ico"))
myUi = wMain.Ui_MainWindow()
myUi.setupUi(myMainWindow)
myMainWindow.show()

会出现图标能够生效,但是标题在生效之后一闪而过,变为“MainWindow”