ios - Xcode inserting record in core data -

i have database in core data needs group items according type. because of cant add item @ end. need insert specific index. can please tell me how insert new record @ index x , moving old index x index x+1 , on. or there way sort record descending acording parameter y ?

thank you

any concept of order created using ordering attribute(s) on entity. it's entirely update / maintain ordering information (and use when fetching / processing fetched results).