Control yourself

I was having problems with code completion in XCode (iPhone dev platform), even though I fixed the obvious problem of it not being turned on by default.  It seemed to still not work like I expected (that expectation was basically that it should work just like Visual Studio, of course).  Well, it doesn't, and it still feels inferior, but at least I've figured out the "trick" (insofar as I don't see it immediately in the docs).  You have to press Control-Period to force the autocomplete to happen (and to cycle through the list if it has already triggered but is stuck on an entry you don't want).  Pressing Control-Slash (which was in the docs) takes you to each param in the param list.