ios - TableView keeps empty after using NSFetchedResultsController -

i've tried use nsfetchedresultscontroller in order display sections tableview. tableview keeps empty.

 @property (nonatomic,strong) nsmanagedobjectcontext* managedobjectcontext; @property (nonatomic, retain) nsfetchedresultscontroller *fetchedresultscontroller;   - (nsmanagedobjectcontext *)managedobjectcontext {     nsmanagedobjectcontext *context = nil;     id delegate = [[uiapplication sharedapplication] delegate];     if ([delegate performselector:@selector(managedobjectcontext)]) {         context = [delegate managedobjectcontext];     }     return context; }  - (void)viewdidload {    self.fetchedresultscontroller = nil;     self.fetchedresultscontroller.delegate = nil;  }   - (nsfetchedresultscontroller *)fetchedresultscontroller {      if (_fetchedresultscontroller != nil) {         return _fetchedresultscontroller;     }      nsmanagedobjectcontext *managedobjectcontext = [self managedobjectcontext];       // create , configure fetch request plant entity.     nsfetchrequest *fetchrequest = [[nsfetchrequest alloc] init];     nsentitydescription *entity = [nsentitydescription entityforname:@"travel" inmanagedobjectcontext:managedobjectcontext];     [fetchrequest setentity:entity];      // create sort descriptors array.     nssortdescriptor *namedescriptor = [[nssortdescriptor alloc] initwithkey:@"name" ascending:yes];     nsarray *sortdescriptors = [[nsarray alloc] initwithobjects:namedescriptor, nil];     [fetchrequest setsortdescriptors:sortdescriptors];      // create , initialize fetch results controller.     nsfetchedresultscontroller *afetchedresultscontroller = [[nsfetchedresultscontroller alloc] initwithfetchrequest:fetchrequest managedobjectcontext:managedobjectcontext sectionnamekeypath:@"country" cachename:@"country"];     self.fetchedresultscontroller = afetchedresultscontroller;     _fetchedresultscontroller.delegate = self;      return _fetchedresultscontroller; }   - (nsinteger)numberofsectionsintableview:(uitableview *)tableview {     // return number of sections.     return [[self.fetchedresultscontroller sections] count]; }  - (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {     id <nsfetchedresultssectioninfo> sectioninfo = [self.fetchedresultscontroller sections][section];     return [sectioninfo numberofobjects]; }   - (nsstring *)tableview:(uitableview *)tableview titleforheaderinsection:(nsinteger)section { return @""; } 

i followed tutorial tableview empty now. tableview worked before fine (with coredata). maybe knows answer question. thanks.

you appear have forgotten after constructing nsfetchedresultscontroller:

nserror *error; bool success = [_fetchedresultscontroller performfetch:&error];