ios - Sort UITableView content (Address Book) alphabetically -

below using retrieve contacts list device. want displayed alphabetically using other examples seen on stack overflow have been unable work. code below tutorial, need sort according alphabetical order?

- (void)getpersonoutofaddressbook {     //1     cferrorref error = null;     abaddressbookref addressbook = abaddressbookcreatewithoptions(null, &error);  if (addressbook != nil) {     nslog(@"succesful.");      //2     nsarray *allcontacts = (__bridge_transfer nsarray *)abaddressbookcopyarrayofallpeople(addressbook);      //3     nsuinteger = 0; (i = 0; < [allcontacts count]; i++)     {         person *person = [[person alloc] init];         abrecordref contactperson = (__bridge abrecordref)allcontacts[i];         //4         nsstring *firstname = (__bridge_transfer nsstring *)abrecordcopyvalue(contactperson,                                                                               kabpersonfirstnameproperty);         nsstring *lastname = (__bridge_transfer nsstring *)abrecordcopyvalue(contactperson, kabpersonlastnameproperty);         nsstring *fullname = [nsstring stringwithformat:@"%@ %@", firstname, lastname];          person.firstname = firstname; person.lastname = lastname;         person.fullname = fullname;          //email         //5         abmultivalueref emails = abrecordcopyvalue(contactperson, kabpersonemailproperty);          //6         nsuinteger j = 0;         (j = 0; j < abmultivaluegetcount(emails); j++) {             nsstring *email = (__bridge_transfer nsstring *)abmultivaluecopyvalueatindex(emails, j);             if (j == 0) {                 person.homeemail = email;                 nslog(@"person.homeemail = %@ ", person.homeemail);             }             else if (j==1) person.workemail = email;          }          //7          [self.tabledata addobject:person];     }      //8     cfrelease(addressbook); } else {      //9     nslog(@"error reading address book"); } } 

this uitableview code:

- (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath { static nsstring *cellidentifier = @"identifier"; uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:cellidentifier]; if (cell == nil) {     cell = [[uitableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellidentifier]; }  person *person = [self.tabledata objectatindex:indexpath.row]; cell.textlabel.text = person.fullname;  return cell; } 

i have tried below

[self.tabledata sortusingselector:@selector(localizedcaseinsensitivecompare:)]; 

i have tried nssortdescriptor don't have key sort by.

you'll need sort array of person objects. once have finished adding them array can sort on fullname using following code:

[self.tabledata sortusingcomparator:^nscomparisonresult(person *p1, person *p2) {     return [p1.fullname compare:p2.fullname]; }]; 

alternative

you may want implement compare: method on person object , perform comparison there, keep sorting logic nicely encapsulated , ensure else uses person objects can perform sorts without duplicating code shown above.

@implementation person  // implementation contain more code, not shown brevity  - (nscomparisonresult)comparebyfullname:(person *)otherperson {     return [self.fullname compare:otherperson.fullname]; }  @end 

then can sort array with:

[self.tabledata sortusingselector:@selector(comparebyfullname:)];