Lockwood N. - iOS Core Animation

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Advanced Techniques

Nick Lockwood

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ISBN-13: 978-0-13-344075-1
ISBN-10: 0-13-344075-3

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For Zoe

Nick Lockwood is head of iOS development at the digital agency AKQA in London, and a prolific developer of applications and open source libraries. He has been working with the iOS platform for the past four years, after making the switch from HTML5 web-app development. Nick first picked up a programming book in 1993 at a middle school rummage sale and hasnt looked back since. He lives in Sidcup with his wife and daughter.

I would like to thank my wife, Angela, and daughter, Zoe, for putting up with seeing even less of me than normal while I wrote this. Thanks to David Deutsch and P.J. Cook for their valuable feedback on the early manuscript. Thanks to Mugunth Kumar for generously agreeing to be my technical editor, and to all the staff at Pearson, particularly Michael Thurston, Sara Schumacher, Angie Doyle, Trina MacDonald, and Olivia Basegio, who between them somehow managed to extract a book from me in the space of four months. Thanks to my parents, for buying me my first programming book at the tender age of 12, and so starting me on the path to my eventual career. Finally, thanks to Kate for all the cups of tea!

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When Apple engineers created the iPhone, they faced a challenge: they needed to create a modern, fast, and fluid user interface, the likes of which had never been seen outside of a video game, and they needed to do it on mobile hardware that was a decade behind current desktops and laptops in terms of graphics performance.

They also had an opportunity: to rebuild AppKit (the Mac OS user interface framework) from the ground up using modern graphics technology without needing to maintain support for the legacy applications inherited from nearly 25 years of Macintosh and NeXTSTEP history.

Their solution was a private framework called Layer Kit, developed by the iPhone software team to provide a high-performance, hardware-accelerated animation and compositing library to replace the slower, Quartz-based software drawing used by AppKit. This framework actually debuted first on Mac OS 10.5 under the name Core Animation, shortly before the iPhone was announced.

Core Animation is not just a set of functions for performing animations; it lies at the very heart of iOS, powering everything you see on screen. Even if you never invoke it explicitly, you are using it