These are some excellent resources to learn computer coding from general to specific for ios.  I ran across that are on iTunes U and  You Tube

The first three  are basic computer courses

Harvard CS50  2013 

Programming Methodology  Standford

Object Oriented Programming Swinburne University

Developing ios 7 Apps for iPhone and iPad   Stanford

Advanced iPhone Development  2010  Madison Area Technical College 

Swift Programming Tutorial 

A helpful book is Sams Teach yourself ios 7 Application Development although now you would probably want to start with Swift which is easier.   You can download the free Swift book from Apple.