选择路径 省略中间 ...

QString strOldDir = ui.labelDownloadSaveDir->text();
	QString strDir = QFileDialog::getExistingDirectory(this, tr("Open Directory"),
		strOldDir,
		QFileDialog::ShowDirsOnly
		| QFileDialog::DontResolveSymlinks);
	if (!strDir.isEmpty())
	{
		ui.labelDownloadSaveDir->setText(QDir::toNativeSeparators(strDir));
		//...save to preference
	}