My xcode base SDK has disappeared and I can't get it back. Even a New project offers me only MAC templates, not iOS templates.
Trying to fix it, I uninstalled and then installed 4.2. Everything looked fine (i.e. both iOS and MAC templates were available) I opened a project I have been working on and WHAP! No base SDK avaiable and many files showed in Navigator as missing, including Foundation and Core.
Two questions: what happened and how do I recover. I don't want to recreate my project if I can avoid that.