June 2011
Intermediate to advanced
590 pages
19h 31m
English
Content preview from iOS Programming: The Big Nerd Ranch Guide, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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For the More Curious: The Presentation Layer and the Model Layer
You can think of an instance of CALayer as having two parts: the content that gets composited onto the screen, and a set of parameters that describe how it should be composited: opacity, transform, position, etc. When a layer is being animated, it actually has two copies of these parameters: the model version and the presentation version. The presentation parameters are the ones that are being smoothly changed by the animation object. The model parameters are the persistent ones – the ones that will be used once the animation is over.
So, when a layer is being animated, its content is composited to the screen using the presentation parameters. When it is animation-less, the model ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.