CAAction Protocol Reference
| Adopted by | |
| Framework | /System/Library/Frameworks/QuartzCore.framework |
| Availability | Available in iOS 2.0 and later. |
| Declared in | CALayer.h |
| Companion guides |
Overview
The CAAction protocol provides an interface that allows an object to respond to an action triggered by an CALayer. When queried with an action identifier (a key path, an external action name, or a predefined action identifier) the layer returns the appropriate action object–which must implement the CAAction protocol–and sends it a runActionForKey:object:arguments: message.
Instance Methods
runActionForKey:object:arguments:
Called to trigger the action specified by the identifier. (required)
Parameters
- key
The identifier of the action. The identifier may be a key or key path relative to anObject, an arbitrary external action, or one of the action identifiers defined in CALayer Class Reference.
- anObject
The layer on which the action should occur.
- dict
A dictionary containing parameters associated with this event. May be
nil.
Availability
- Available in iOS 2.0 and later.
Declared In
CALayer.h© 2007 Apple Inc. All Rights Reserved. (Last updated: 2007-07-24)