Re: KVC triggers Key-value access using _setKey: is deprecated

[Richard Frith-Macdonald]

On 5 Jun 2010, at 22:34, David Wetzel wrote:

> Hi Folks,
> 
> - (void)setValue:(id)value forKeyPath:(NSString *)keyPath
> 
> triggers
> 
> GSOnceFLog(@"Key-value access using _setKey: is deprecated:");
> 
> on GNUstep base.
> setValue: forKeyPath: is not depricated, so base must be wrong somewhere...

Take a look at 
http://developer.apple.com/mac/library/documentation/cocoa/conceptual/KeyValueCoding/Concepts/SearchImplementation.html

Near the end of that page I see this:

For backward binary compatibility with the behavior of takeValue:forKey:, a 
method whose name matches the pattern -_set<Key>: is also recognized in step 1. 
KVC accessor methods whose names start with underscores are deprecated as of 
Mac OS X v10.3.

My reading of this is that firstly, calling 'setValue:forKeyPath:' will call 
_setKey: as a last resort for backward compatibility, and secondly, _setKey: is 
deprectated.  Which seems to fit the behavior you are seeing.