Returns an object that implements the default action for the specified identifier.
Original signature is '+ (id < CAAction >)defaultActionForKey:(NSString *)key'
Available in Mac OS X v10.5 and later.


- key (NSString)
- The identifier of the action.

Returns the object that provides the action for key.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)