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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23Controlling Animation with CAAnimation
An animation object drives change over time. An animation object is an instruction set (“Move from point A to point B over 2 seconds”) that can be added to a CALayer instance. When an animation object is added to a layer, that layer begins following the instructions of the animation. Many properties of CALayer can be animated by animation objects: opacity, position, transform, bounds, and contents are just a few.
Animation Objects
While you have not yet used animations objects explicitly, all animation in iOS is driven by them, including the animations you saw in the last chapter. The abstract superclass for all animation objects is CAAnimation. CAAnimation is responsible for handling timing; for instance, ...
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