Hi,
I've a "PresetsController" which holds a dictionary containing preset settings
for my application. The presets contain trees (Mutable Dictionaries) of keys.
To save the GUI code from bothering with tracking the current preset, I want to
give my PresetController the option to replace a keyPath like
@"current.parameter.subparameter.value" to
@"preset2.parameter.subparameter.value".
I implemented it with a valueForUndefinedKey:
- (id) valueForUndefinedKey:(NSString *)key {
if ([key isEqual:@"current"])
return [presets valueForKey:currentPreset]; //presets is a
NSMutableDicitonary, currentPreset a NSString
else
return [presets valueForKey:key];
}
, returning the dictionary belonging to the current preset. This works for
setting and reading using keyPaths. It does not work for observing a keyPath
like @"current.parameter.subparameter.value". How should I implement that? I
tried monitoring all keyPaths in the dictionaries, and than calling [self
will/didChange] like:
- (void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
change:(NSDictionary *)change context:(void *)context {
NSString *newKeyPath=[keyPath
stringByReplacingOccurrencesOfString:currentPreset withString:@"current"];
if ([keyPath hasPrefix:currentPreset]) {
if ([[change
valueForKey:NSKeyValueChangeNotificationIsPriorKey] boolValue])
[self willChangeValueForKey:newKeyPath];
else
[self didChangeValueForKey:newKeyPath];
}
}
but this doesn't trigger anything. If I replace newKeyPath with @"current" than
all observers will get a trigger, independent of any (sub)parameters.
What would be the correct way to trigger the observers?
Kind regards,
Remco Poelstra
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