如何在Xcode 7 / iOS 9中找到CNGroup的成员数

Question

I want to display the names of each of the CNGroups in an iPhone's contacts database, and the number of people in each group.

I have the array of CNGroups , so I can get the name and the identifier properties of each group

I could call

[CNContact predicateForContactsInGroupWithIdentifier: theGroup.identifier] ,

then create a fetch on the CNContactStore using that predicate and then count the number of elements of the array that is returned and that works.

That seems a long winded and processor intensive way of finding out the number of members, so much so that I'm sure there must be a easier way to achieve this.

Have I missed something or is this the way it has to be done?

Thanks.

Answer 1

That would be how I would do it, if you're finding it to be hitting performance you could always dispatch it onto a background queue since according to the documentation

this framework is optimized for thread-safe, read-only usage