Ray Wenderlich's tutorials are completely comprehensive and have a ton of screenshots. This one takes you through the steps of making your first iPhone app with table views and an image picker. It introduces iOS patterns and the XCode working environment without overloading you with a lot of theory.
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@kateray
Big Nerd Ranch is one of the leading publishers of mobile app dev books. This book is extremely in-depth and teaches you a lot about Objective C and some theory around iOS dev.
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@kateray
This is a very basic guide to iOS development aimed at designers. It gives a nice tour of the environment and even a nice gallery of example interfaces.
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@kateray
Provides tutorials for many different aspects you might want to include in your app. It also updates tutorials on a regular basis, staying current with ios 7.
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@milesper