CODEWITHSUNDEEP
iosnsobjectnsset
Darren
Darren

Reputation: 10129

Accessing properties of objects in an NSSet

I have an object called Contact. A Contact has a relationship with a set of PhoneNumber objects.

A phone number has a label and a value property (both NSString pointers).

How do I get a set of all the phone number labels for a given Contact?

Here is the code for what I want to do, but I think there must be an easier way:

NSSet *phoneNumbersSet = contact.phoneNumbers;
NSArray *phoneNumbersArray = [phoneNumbersSet allObjects];
NSMutableSet *phoneNumberLabelSet = [NSMutableSet setWithCapacity:0];
for (PhoneNumber* phoneNumber in phoneNumbersArray) {
   [phoneNumberLabelSet addObject:phoneNumber.label];
}

Upvotes: 0

Views: 1423

Answers (1)

Brian Palma
Brian Palma

Reputation: 641

NSSet *phoneNumbersSet = contact.phoneNumbers;
NSSet *phoneNumberLabelSet = [phoneNumbersSet valueForKey:@"label"];

NSSet has a valueForKey: instance method that calls valueForKey: on each of it's members. I believe that if your set is filled with phoneNumbers you can call valueForKey:@"label" and it will return a set with each of the phoneNumber's respective labels.

Upvotes: 3

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