I’ve just pushed commit 2fd7c58 so if you rebuild the Projucer from the develop branch you can now specify a path to your .storyboard file relative to the project folder and it’ll be added as an Xcode resource. This means that you no longer need to add the file to the project source and it can be added only for the iOS build.
So for a folder structure like this:
Your .jucer project should look like this:
