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.

Availability
  • Available in iOS 3.0 and later.
Declared In
CAAnimation.h

Class Methods

animationWithKeyPath:

Creates and returns an CAPropertyAnimation instance for the specified key path.

+ (id)animationWithKeyPath:(NSString *)keyPath
Parameters
keyPath

The key path of the property to be animated.

Return Value

A new instance of CAPropertyAnimation with the key path set to keyPath.

Availability
  • Available in iOS 2.0 and later.
Related Sample Code
Declared In
CAAnimation.h