The Autumn 2013 edition of Stanford University professor Paul Hegarty's popular Developing iOS Apps course is now live on iTunes U, fully updated for iOS 7. Professor Hegarty teaches the class every year and it remains an excellent introduction to iOS for coders looking to build their skills.
So far, videos and notes from four lectures have been posted, and more will be added throughout Stanford's Autumn Quarter.
Updated for iOS 7. Tools and APIs required to build applications for the iPhone and iPad platform using the iOS SDK. User interface designs for mobile devices and unique user interactions using multi-touch technologies. Object-oriented design using model-view-controller paradigm, memory management, Objective-C programming language. Other topics include: object-oriented database API, animation, multi-threading and performance considerations.
Prerequisites: C language and programming experience at the level of 106B (Programming Abstractions) or X. Recommended: UNIX, object-oriented programming, graphical toolkits
Stanford notes that CS106B Programming Abstractions (also available on iTunes U) should be taken by students before taking this class. Stanford and a number of other educational institutions have a wide variety of engineering and computer science classes available free on iTunes U.