NSDictionary from NSArray using KVC

Question

Is it possible to get an NSDictionary using KVC from a NSArray of CALayer based on key property name? I tried using -dictionaryWithValuesForKeys:, but that returns an NSArray. Any idea?

   NSArray *tempArray = [self.layer.sublayers copy];
   NSArray *ListName = [self.layer.sublayers valueForKey:@"name"];

   NSDictionary *tmpD= [tempArray dictionaryWithValuesForKeys:ListName];

Thanks

score 5 · Accepted Answer · answered Aug 14 '13 at 20:11

5

Is this what you're asking about?

NSDictionary * layersByName = [NSDictionary dictionaryWithObjects:[self.layer.sublayers copy]
                                                          forKeys:[self.layer.sublayers valueForKey:@"name"]];

-[NSArray valueForKey:] returns an array formed by asking each object in the reciever for its own valueForKey:, using the same argument.

answered Aug 14 '13 at 20:11

jscs

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Fantastic , that was much easier then i thought :) – user519274 Aug 15 '13 at 02:23

score 0 · Answer 2 · answered Aug 14 '13 at 19:19

0

I don’t know of a way to do this directly with KVC. It’s pretty simple to do just by iterating over the array, though:

NSMutableDictionary *layersByName = [NSMutableDictionary dictionary];
for (CALayer *layer in self.layer.sublayers)
{
    [layersByName setObject:layer forKey:layer.name];
}

answered Aug 14 '13 at 19:19

Noah Witherspoon

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Yep that would the simplest way of doing it . I was just wondering if it is possible using KVC – user519274 Aug 14 '13 at 19:26

NSDictionary from NSArray using KVC

2 Answers2