CAPropertyAnimation

CAPropertyAnimation详解

最新推荐文章于 2017-10-27 18:39:11 发布

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最新推荐文章于 2017-10-27 18:39:11 发布

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原文链接：http://www.cnblogs.com/zyingn/articles/iOS_reference2.html

本文详细介绍了CAPropertyAnimation类，它是Core Animation框架的一部分，用于创建操纵层属性值的动画。文章涵盖了该类的主要特性，包括如何指定动画的关键路径、确定值的计算行为以及创建动画实例的方法。

CAPropertyAnimation Class Reference

Inherits from	CAAnimation : NSObject
Conforms to	NSCoding (CAAnimation) NSCopying (CAAnimation) CAAction (CAAnimation) CAMediaTiming (CAAnimation) NSObject (NSObject)
Framework	/System/Library/Frameworks/ QuartzCore.framework
Availability	Available in iOS 2.0 and later.
Declared in	CAAnimation.h
Companion guides	Core Animation Programming Guide Core Animation Cookbook

Overview

CAPropertyAnimation is an abstract subclass of CAAnimation for creating animations that manipulate the value of layer properties. The property is specified using a key path that is relative to the layer using the animation.

Tasks

Animated Key Path

Property Value Calculation Behavior

Creating an Animation

Properties

additive

Determines if the value specified by the animation is added to the current render tree value to produce the new render tree value.

@property(getter=isAdditive) BOOL additive

Discussion

If YES, the value specified by the animation will be added to the current render tree value of the property to produce the new render tree value. The addition function is type-dependent, e.g. for affine transforms the two matrices are concatenated. The default is NO.

Availability

Available in iOS 2.0 and later.

Declared In

CAAnimation.h

cumulative

Determines if the value of the property is the value at the end of the previous repeat cycle, plus the value of the current repeat cycle.

@property(getter=isCumulative) BOOL cumulative

Discussion

If YES, then the value of the property is the value at the end of the previous repeat cycle, plus the value of the current repeat cycle. If NO, the value of the property is simply the value calculated for the current repeat cycle. The default is NO.

Availability

Available in iOS 2.0 and later.

Declared In

CAAnimation.h

keyPath

Specifies the key path the receiver animates.

@property(copy) NSString *keyPath

Discussion

The key path is relative to the layer the receiver is attached to.

Availability

Available in iOS 2.0 and later.

Declared In

CAAnimation.h

valueFunction

An optional value function that is applied to interpolated values.

@property(retain) CAValueFunction *valueFunction

Discussion

If the valueFunction property is not nil, the function is applied to the values interpolated by the animation as they are applied to the presentation layer. Defaults to nil.