Pyqt5 QFileDialog无法在我的程序中获取目录

from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        self.setWindowTitle("File Dialog Example")
        self.setGeometry(100, 100, 300, 200)

        self.showFileDialog()

    def showFileDialog(self):
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        directory = QFileDialog.getExistingDirectory(self, "Select Directory", options=options)

        if directory:
            print("Selected Directory:", directory)

if __name__ == "__main__":
    app = QApplication([])
    window = MainWindow()
    app.exec_()