objective c - Cocoa NSIndexSet : Multiple Indexes. How to create the index set, multiple indexes? -

i trying figure out how create set of indexes of lets (1, 2, 3) use in

- (void)selectrowindexes:(nsindexset *)indexes byextendingselection:(bool)extend 

it's (nsindexset *)indexes not know how use / create / populate indexes 1, 2, 3. should use class method or instance method?

i tried whole bunch of ways have no idea i'm doing ...

if indexes consecutive in example, can use this:

nsindexset *indexset = [nsindexset indexsetwithindexesinrange:nsmakerange(1, 3)]; 

if not, create mutable index set , add indexes (or ranges) 1 one:

nsmutableindexset *indexset = [nsmutableindexset indexset]; [indexset addindex:3]; [indexset addindex:5]; [indexset addindex:8];