OReilly – An Introduction to iOS Programming 2nd Edition

Sign up as an Apple developer, and generate all of the certificates and provisioning profiles you need
Become familiar with the Xcode and the iOS SDK by building a simple Hello World app
Dive deep into the Cocoa Touch frameworks
Build reusable code that enables you to embed web pages in your app
Create a working Twitter Trends app and learn how to use several development techniques
Prepare your finished app for sale on the App Store and upload it to iTunes Connect