szymczyk is right. These are 2 different things: learning XCode and Storyboards, which is quite independant of the language. And learning objective C. Do I guess well that you already know objC ? If so, use an Apple tutorial (App development with Swift for instance) but code everything in ObjC instead of Swift. That should be fairly easy.
Topic:
App & System Services
SubTopic:
Core OS
Tags: