On Nov 12, 2010, at 10:16, Quincey Morris wrote:
> - (id) valueForUndefinedKey: (NSString*) key {
> id retVal=[properties objectForKey:key]; // note: NOT 'valueForKey:'
> if (!retVal) {
> //fetch value from network
> //We do not wait for the value
> }
> return retVal;
> }
Oops, sorry, I meant to suggest a slightly different implementation, but
forgot. Here's what I had in mind:
static NSSet* knownKeys = [NSSet setWithObjects: ... list of 82 keys your
dictionary is allowed to contain ..., nil];
- (id) valueForUndefinedKey: (NSString*) key {
if (![knownKeys containsObject: key])
return [super valueForUndefinedKey: key];
id retVal=[properties objectForKey:key]; // note: NOT 'valueForKey:'
if (!retVal) {
//fetch value from network
//We do not wait for the value
}
return retVal;
}
Alternatively, you could prefill your dictionary with [NSNull null] values for
all keys, and test for that instead.
That way you can tell the difference between an invalid key and a key that
hasn't been fetched yet.
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