The following predicate could work:
[NSPredicate predicateWithFormat:@"(items.@count == %d) AND (SUBQUERY(items, $x, $x IN %@).@count == %d)",
itemSet.count, itemSet, itemSet.count];
The predicate checks first that the number of items is equal to the size of the given itemSet
, and then checks that the number of items which are member of itemSet
is also equal to the size of itemSet
. If both are true, then items
must be equal to itemSet
.