Autogenerate UML diagram for my xcode project?

I want to make a开发者_如何转开发 UML diagram for my xcode project automatically. Is there a tool out there that can do that for me? I've only found things like Omnigraffe.

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Doxygen is able to generate some class diagrams using dot and graphviz. Here is a sample project using it. But, to make it work you need MacPorts to port install doxygen dot and then edit the Doxygen text config file (included on that project) and set HAVE_DOT = YES and UML_LOOK = YES.

It's not complete and it's not much, but doxygen is the lesser of two evils. I wish someone knows a better option or a better tool appears.