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# CAPropertyAnimation

An abstract subclass for creating animations that manipulate the value of layer properties.

```
class CAPropertyAnimation
```

## Overview

The property to animate is specified using a key path that is relative to the layer using the animation.

You do not create instances of [`CAPropertyAnimation`](/documentation/QuartzCore/CAPropertyAnimation): to animate the properties of a Core Animation layer, create instance of the concrete subclasses [`CABasicAnimation`](/documentation/QuartzCore/CABasicAnimation) or [`CAKeyframeAnimation`](/documentation/QuartzCore/CAKeyframeAnimation).

## Topics

### Animated Key Path

[`keyPath`](/documentation/QuartzCore/CAPropertyAnimation/keyPath)

Specifies the key path the receiver animates.

### Property Value Calculation Behavior

[`isCumulative`](/documentation/QuartzCore/CAPropertyAnimation/isCumulative)

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.

[`isAdditive`](/documentation/QuartzCore/CAPropertyAnimation/isAdditive)

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

[`valueFunction`](/documentation/QuartzCore/CAPropertyAnimation/valueFunction)

An optional value function that is applied to interpolated values.

### Creating an Animation

[`init(keyPath:)`](/documentation/QuartzCore/CAPropertyAnimation/init(keyPath:))

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


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