I am using Xcode 4.3.2 and I am trying to add some SDK references to my project. I can SEE the files using Finder, as I used the terminal script to view hidden files. Yet, when I go to my user home directory in Xcode finder, it does not show the "hidden" 'Library' folder under my user profile that stores my SDK files.
Scratching head
Press and hold the ⌘ + shift and . keys at the same time.
Then you can switch to view hidden/non-hidden files.