ios - Passing String Value of a NSManagedObject attribute to a new view controller -

i have tableview populated nsstring values nsfetchedresultscontroller. have cells configured check/uncheck cells. works perfectly.

i'm trying configure cells clicking 1 of labels within cell triggers segue view controller. configured label , threw log statement in i'd segue , works properly. when add segue, no compiler errors, crashes @ runtime follow error:

2015-05-31 08:09:04.656 myapp[17682:1240919] -[uiviewcontroller selecteditemphoto:]: unrecognized selector sent instance 0x7fa42b65d4e0 2015-05-31 08:09:04.694 myapp[17682:1240919] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[uiviewcontroller selecteditemphoto:]: unrecognized selector sent instance 0x7fa42b65d4e0' 

i'm i'm doing startlingly stupid, i'm stumped what. welcome suggestions.

mycustomcell.h:

@property (strong, nonatomic) iboutlet uilabel *itemdescription; @property (strong, nonatomic) iboutlet uilabel *itemgroup; @property (strong, nonatomic) iboutlet uiimageview *itemimage; 

firstvc.m methods:

cellforrowatindexpath method

- (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {     // implement custom cell     mycustomcell *customcell = [tableview dequeuereusablecellwithidentifier:@"customcell" forindexpath:indexpath];      // hold of mymanagedobject frc     mynsmanagedobject *myobject = [self.fetchedresultscontroller objectatindexpath:indexpath];      // configures 1st label hyperlink     customcell.itemdescription.text = myobject.itemdescription;     customcell.itemdescription.textcolor = [uicolor bluecolor];     customcell.itemdescription.userinteractionenabled = yes;      // enables gesture , sets demoobject pass along via segue called labeltap     uitapgesturerecognizer *labeltapgesture = [[uitapgesturerecognizer alloc]initwithtarget:self action:@selector(labeltap)];     [customcell.itemdescription addgesturerecognizer:labeltapgesture];     self.demoobject = myobject;      // configures 2nd label within customcell     customcell.itemgroup.text = myobject.itemgroup;     // add image cell, imported images.xcassets     nsstring *imagename = [nsstring stringwithformat:@"%@-1.jpg", myobject.photo];     customcell.imageview.image = [uiimage imagenamed:imagename];      // following code ensures random checkmarks don't appear when user scrolls.     if ([self.selectedobjects containsobject:[self.fetchedresultscontroller objectatindexpath:indexpath]]) {         customcell.accessorytype = uitableviewcellaccessorycheckmark;     } else {         customcell.accessorytype = uitableviewcellaccessorynone;     }      return customcell; } 

didselectrowatindexpath method

-(void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath {      self.selectedobject = [self.fetchedresultscontroller objectatindexpath:indexpath];      // set checkmark accessory selected row.     if ([tableview cellforrowatindexpath:indexpath].accessorytype == uitableviewcellaccessorynone) {         [[tableview cellforrowatindexpath:indexpath] setaccessorytype:uitableviewcellaccessorycheckmark];         [self.selectedobjects addobject:self.selectedobject];         [tableview deselectrowatindexpath:indexpath animated:yes];     } else {         [[tableview cellforrowatindexpath:indexpath] setaccessorytype:uitableviewcellaccessorynone];         [self.selectedobjects removeobject:self.selectedobject];         [tableview deselectrowatindexpath:indexpath animated:yes];     }      // enables save button if there items in selectedobjects array     if (self.selectedobjects.count > 0) {         [self.savebutton setenabled:yes];     } else {         [self.savebutton setenabled:no];     }    } 

labeltap method

- (void) labeltap {     // "hyperlink" effect i'm trying achieve works without segue     nslog(@"itemdescription tapped");     [self performseguewithidentifier:@"mysegue" sender:nil]; } 

prepareforsegue method

- (void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {     if ([[segue identifier] isequaltostring:@"mysegue"] && self.demoobject != nil) {         // line returns value...         nslog(@"self.demoobject = %@", self.demoobject.itemdescription);         // ...but crashes here when tries set on destinationviewcontroller         secondviewcontroller *destinationviewcontroller = [segue destinationviewcontroller];         destinationviewcontroller.selecteditemphoto = self.demoobject.photo;         destinationviewcontroller.selecteditemtitle = self.demoobject.itemdescription;     } } 

secondviewcontroller.h properties

// photo string references filename in app @property (nonatomic, strong) nsstring *selecteditemphoto; @property (nonatomic, strong) nsstring *selecteditemtitle; 

from error seems did not set class of second view controller. seems uiviewcontroller , should secondviewcontroller.

in storyboard select second view controller , set class secondviewcontroller.

another advice in objective c should use introspection before casting object. in code add:

- (void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {     if ([[segue identifier] isequaltostring:@"mysegue"] && self.demoobject != nil) {         // line returns value...         nslog(@"self.demoobject = %@", self.demoobject.itemdescription);         // ...but crashes here when tries set on destinationviewcontroller         if ([[segue destinationviewcontroller] iskindofclass:[secondviewcontroller class]]) {             secondviewcontroller *destinationviewcontroller = (secondviewcontroller *)[segue destinationviewcontroller];             destinationviewcontroller.selecteditemphoto = self.demoobject.photo;             destinationviewcontroller.selecteditemtitle = self.demoobject.itemdescription;         }     } } 

in way segue won't happen app won't crash.