On Feb 28, 2010, at 11:45 AM, Chris Tracewell wrote:
> On Feb 28, 2010, at 9:26 AM, Jens Alfke wrote:
>
>> On Feb 28, 2010, at 8:23 AM, Chris Tracewell wrote:
>>
>>> I have two synthesized properties - A and B. Whenever A changes I need B to
>>> be updated to A.keypath.
>>
>> If B's value is entirely dependent upon A, you don't even need to synthesize
>> it — you can just implement B's getter to return A.keypath, and declare B as
>> dependent on A:
>>
>> - (NSString*) b {return A.keypath; }
>> + (NSArray*) keyPathsForValuesAffectingB { return [NSArray arrayWithObject:
>> @"a"]; }
>
> keyPathsForValuesAffecting looks like what I am looking for.
Except note that it should return an NSSet, not an NSArray.
+ (NSSet*) keyPathsForValuesAffectingB { return [NSSet setWithObject:@"a"]; }
Regards,
Ken
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