ios - Slow UISearchDisplayController with Core Data -


i have tableviewcontroller displaying 40 000 rows core data nsfetchedresultscontroller.

i implemented live search uisearchdisplaycontroller (support ios 7). it's working typing on keyboard when searching slow...

i'd appreciate if point me right direction , show me might going wrong.

here uisearchresultsupdating part in tableviewcontroller

- (bool)searchdisplaycontroller:(uisearchdisplaycontroller *)controller shouldreloadtableforsearchstring:(nsstring *)searchstring {     itemsearchscope scopekey = controller.searchbar.selectedscopebuttonindex;     [self searchfortext:searchstring scope:scopekey];     return yes; }  - (bool)searchdisplaycontroller:(uisearchdisplaycontroller *)controller shouldreloadtableforsearchscope:(nsinteger)searchoption {     nsstring *searchstring = controller.searchbar.text;     [self searchfortext:searchstring scope:searchoption];     return yes; }  - (void)searchfortext:(nsstring *)searchtext scope:(itemsearchscope)scopeoption {     if (self.managedobjectcontext) {     nsstring *predicateformat = @"%k contains[cd] %@";      nsstring *searchattribute1 = @"attribute1";     nsstring *searchattribute2 = @"attribute2";     nsstring *searchattribute3 = @"attribute3";      if (scopeoption == searchscopedebut) {         predicateformat = @"%k beginswith[cd] %@";     }      if (scopeoption == searchscopefin) {         predicateformat = @"%k endswith[cd] %@";     }      nspredicate *p1 = [nspredicate predicatewithformat:predicateformat, searchattribute1, searchtext];     nspredicate *p2 = [nspredicate predicatewithformat:predicateformat, searchattribute2, searchtext];     nspredicate *p3 = [nspredicate predicatewithformat:predicateformat, searchattribute3, searchtext];      nspredicate *predicate = [nscompoundpredicate orpredicatewithsubpredicates:@[p1, p2, p3]];      [self.searchfetchrequest setpredicate:predicate];      nserror *error = nil;     self.filteredlist = [self.managedobjectcontext executefetchrequest:self.searchfetchrequest error:&error];     if (error)     {         nslog(@"searchfetchrequest failed: %@",[error localizeddescription]);     } }

}

i ended using nstimer delaying shouldreloadtableforsearchstring method. searchtimerpopped selector triggered if user stop typing keyboard 2 seconds.

@property (nonatomic, retain) nstimer *searchtimer;  - (bool)searchdisplaycontroller:(uisearchdisplaycontroller *)controller shouldreloadtableforsearchstring:(nsstring *)searchstring {     if (self.searchtimer) {         [self.searchtimer invalidate];         self.searchtimer = nil;     }     self.searchtimer = [nstimer scheduledtimerwithtimeinterval:2 target:self selector:@selector(searchtimerpopped:) userinfo:searchstring repeats:false];     return no; }  - (void)searchtimerpopped:(nstimer *)timer {     nsstring *searchstring = [timer userinfo];     itemsearchscope scopekey = self.searchdisplaycontroller.searchbar.selectedscopebuttonindex;     [self searchfortext:searchstring scope:scopekey];     [self.searchdisplaycontroller.searchresultstableview reloaddata]; }

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