CATransformLayer Class Reference

Inherits from
Conforms to
Framework
/System/Library/Frameworks/QuartzCore.framework
Availability
Available in iOS 3.0 and later.
Declared in
CATransformLayer.h
Companion guides

Overview

CATransformLayer objects are used to create true 3D layer hierarchies, rather than the flattened hierarchy rendering model used by other CALayer classes.

Unlike normal layers, transform layers do not flatten their sublayers into the plane at Z=0. Due to this, they do not support many of the features of the CALayer class compositing model:

Tasks

Hit Testing

Instance Methods

hitTest:

Returns the farthest descendant of the receiver in the layer hierarchy (including itself) that contains a specified point.

- (CALayer *)hitTest:(CGPoint)thePoint
Parameters
thePoint

A point in the coordinate system of the receiver's superlayer.

Return Value

The layer that contains thePoint, or nil if the point lies outside the receiver’s bounds rectangle.

Discussion

Transform layers do not support hit-testing. As a result, you should not send hitTest: messages to transform layers.