Preface
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 ...
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