On 14 Dec 2008, at 16:06, Ken Thomases wrote:
I was surprised to learn that a hierarchy of NSDictionary objects
can be queried with valueForKeyPath:
NSDictionary *dict0 = [NSDictionary
dictionaryWithObjectsAndKeys:@"got me!", @"2", nil];
NSDictionary *dict = [NSDictionary
dictionaryWithObjectsAndKeys:dict0, @"1", nil];
NSLog([dict valueForKeyPath:@"1.2"]);
This is powerful functionality.
Am I blind (again), or is this fact omitted from the docs? Or is it
implicit from the nature of KVC?
It's implicit in two facts:
1) The default implementation of -valueForKeyPath: resolves down to
a series of -valueForKey: calls
2) The override of -valueForKey: on NSDictionary resolves to a call
to -objectForKey: in most cases
Thanks Ken
The docs on NSDictionary -valueForKey: do mention it.
Blind and stupid.
Jonathan Mitchell
Central Conscious Unit
http://www.mugginsoft.com
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