ios - Core Data not Persisting -

i'm having problem core data. have table view viewcontroller1 populated array populated data in core data model. when cell selected, push segue viewcontroller2, can view saved data. there, have button called "edit" that, when selected, modal segue viewcontroller3 can edit data. here's code have saving edited data.

//editmodel  [self.editmodel setvalue:self.editnametextfield.text forkey:@"name"]; [self.editmodel setvalue:self.edittextview.text forkey:@"text"]; [self.editmodel setvalue:[nsdate date] forkey:@"date"];  nserror *error; if (![[self.delegate managedobjectcontext] save:&error]) {     nslog(@"can't save edit: %@", [error localizeddescription]); }  if (self.delegate)     [self.delegate dismissedit:self]; else     nslog(@"there no delegate"); 

however, whenever try calling this, nslog: can't save edit: (null)

viewcontroller2 reflects change; table view in viewcontroller1. but, when quit ios simulator , run again, data previous editing process. help?

most managed object context isn't being made available delegate. rather delegate, each managed object has link managed object context added can do:

[self.editmodel.managedobjectcontext save:&error]