iphone - How to sorting core data fetch result -


hi need sort fetch result deasending order here code 

nsmanagedobjectcontext *context = [appdelegate managedobjectcontext];   nserror *error1; nsentitydescription *entitydesc; nsfetchrequest *fetchrequest = [[nsfetchrequest alloc] init]; entitydesc=[nsentitydescription entityforname:@"subcategoryentity" inmanagedobjectcontext:context]; [fetchrequest setentity:entitydesc]; nssortdescriptor *sortdescriptor = [[nssortdescriptor alloc]                                             initwithkey:@"subcategoryid" ascending:no]; [fetchrequest setsortdescriptors:[nsarray arraywithobject:sortdescriptor]]; [sortdescriptor release]; nsarray *array = [context executefetchrequest:fetchrequest error:&error1];

here use "subcategory" string type show me correct order in "single digits" couldn't work in "double digits"

here order after count "11" "9","8","7","6","5","4","3","2","1","10","0"

here need show "10","9","8","7","6","5","4","3","2","1","0"

i don't why it's happing can 1 me

thanks advance.

you're getting order in way because how sorting of strings work. can try using nssortdescriptor custom comparesubcategoryid: selector in custom subcategory class subcategoryentity.

update

initialize sort descriptor this:

nssortdescriptor *sortdescriptor = [[nssortdescriptor alloc] initwithkey:@"subcategoryid"                                                             ascending:no                                                             selector:@selector(comparesubcategoryid:)];

then add method custom nsmanagedobject subclass:

- (nscomparisonresult)comparesubcategoryid:(id)otherobject {   int ownsubcatid = [[self subcategoryid] intvalue];   int othersubcatid = [[otherobject subcategoryid] intvalue];    if (ownsubcatid < othersubcatid) return nsorderedascending;   if (ownsubcatid > othersubcatid) return nsordereddescending;   return nsorderedsame; }

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