options = QFileDialog.Options()
file_names, _ = QFileDialog.getExistingDirectory(self, "选择文件", "", "Files (*.*)", options=options)
files = [u for u in file_names]
print(files)

selected_directory8 = QFileDialog.getExistingDirectory()

if not selected_directory8:
    return

if os.path.isdir(str(selected_directory8)):
    selected_directory = selected_directory8
    self.ui.lb_setdir.setText(selected_directory)