Published at LXer:

Johnathan Zdziarski's book Open iPhone Application Development is a guide writing applications for the iPhone without engaging the restrictions of Apple's official software development kit (SDK). The book takes readers on a concise tour of iPhone jailbreaking, setting up the free compiler tool chain, writing basic Objective-C apps, and the available libraries and APIs. Apple might not like this book, but if you need to develop for the iPhone or just want to learn more about how it works, you'll be hard-pressed to find a better practical resource.

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