与操作系统无关的方式在R中以交互方式选择目录

I would like users to be able to select a directory interactively in R. The solution needs to work on different platforms (at least on Linux, Windows and Mac machines that have a graphical desktop environment). And it needs to be robust enough to work on a variety of computers. I've run into problems with the variants I know of:I would like users to be able to select a direc