I highly recommend Programming in Objective-C by Stephen G. Kochan. After that, a free Stanford course on iTunes U is a great resource for wrapping your head around Xcode and iOS development concepts. The course number is CS193p taught by Professor Paul Hegarty. I think the newest semester is called "Developing iOS 7 Apps for iPhone and iPad". iTunes link: https://itunes.apple.com/us/course/developing-ios-7-apps-for...