CALayer Animatable Properties

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本文详细介绍了 CALayer 类中可被 Core Animation 动画化的各项属性，并提供了默认动画设置说明。包括锚点、背景颜色、边框样式等属性及其默认动画实现方式。

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源自：iOS SDK文档

CALayer Animatable Properties

The following CALayer class properties can be animated by Core Animation. See CALayer for more information.

anchorPoint Uses the default implied CABasicAnimation described in Table 1.
backgroundColor Uses the default implied CABasicAnimation described in Table 1. (subproperties are animated using a basic animation)
backgroundFiltersUses the default implied CATransitionAnimation described in Table 2. Sub-properties of the filters are animated using the default implied CABasicAnimation described in Table 1.
borderColor Uses the default implied CABasicAnimation described in Table 1.
borderWidth Uses the default implied CABasicAnimation described in Table 1.
boundsUses the default implied CABasicAnimation described in Table 1.
compositingFilterUses the default implied CATransitionAnimation described in Table 2. Sub-properties of the filters are animated using the default implied CABasicAnimation described in Table 1.
contents
contentsRect Uses the default implied CABasicAnimation described in Table 1.
cornerRadiusUses the default implied CABasicAnimation described in Table 1.
doubleSidedNo default implied animation is set.
filtersUses the default implied CABasicAnimation described in Table 1. Sub-properties of the filters are animated using the default implied CABasicAnimation described in Table 1.
frameThe frame property itself is not animatable. You can achieve the same results by modifying the bounds and position properties instead.
hidden Uses the default implied CABasicAnimation described in Table 1.
maskUses the default implied CABasicAnimation described in Table 1.
masksToBounds Uses the default implied CABasicAnimation described in Table 1.
opacity Uses the default implied CABasicAnimation described in Table 1.
positionUses the default implied CABasicAnimation described in Table 1.
shadowColorUses the default implied CABasicAnimation described in Table 1.
shadowOffsetUses the default implied CABasicAnimation described in Table 1.
shadowOpacityUses the default implied CABasicAnimation described in Table 1.
shadowRadiusUses the default implied CABasicAnimation described in Table 1.
sublayersUses the default implied CATransitionAnimation described in Table 2.
sublayerTransformUses the default implied CABasicAnimation described in Table 1.
transformUses the default implied CABasicAnimation described in Table 1.
zPositionUses the default implied CABasicAnimation described in Table 1.

iOS不支持这些属性的动画：backgroundFilter、filters、shadowColor、shadowOffset、shadowOpacity、shadowRadiu。（笔者注）

Table 1 Default Implied Basic Animation

Description	Value
Class	CABasicAnimation
duration	.25 seconds, or the duration of the current transaction
keyPath	Dependent on layer property type

Table 2 Default Implied Transition

Description	Value
Class	CATransition
duration	.25 seconds, or the duration of the current transaction
type	Fade (kCATransitionFade)
startProgress	0.0
endProgress	1.0