ios - Add object to an NSArray from UITableViewCell -

i have created customed uitableviewcell contains pfobject property , button. want button add object on nsmutablearray , pass array uiviewcontroller. problem can't implement prepareforsegue method custom uitableviewcell when display array in restocardconfirmationvc empty array.

this code :

#import "boxtableviewcell.h" #import "restocardconfirmationviewcontroller.h" #import "restaucardviewcontroller.h"  @implementation boxtableviewcell {    nsmutablearray *_pickerplace;    restaucardviewcontroller *_restocardvc;    restocardconfirmationviewcontroller *_restocardconfirmationvc; }  - (void)awakefromnib {    // initialization code }  - (void)setselected:(bool)selected animated:(bool)animated {    [super setselected:selected animated:animated];     // configure view selected state }   - (nsinteger)numberofcomponentsinpickerview:(uipickerview *)pickerview {    return 1; }   - (nsinteger)pickerview:(uipickerview *)pickerview numberofrowsincomponent:(nsinteger)component {    return _pickerplace.count; }  - (nsstring*)pickerview:(uipickerview *)pickerview titleforrow:(nsinteger)row forcomponent:(nsinteger)component {     return [_pickerplace objectatindex:row]; }  - (ibaction)select:(id)sender {    nslog(@"the select box : %@",_box);    [_restocardconfirmationvc.boxescommande addobject:_box];    self.select.enabled = no; } @end 

restacardconfirmation.h

#import <uikit/uikit.h> #import <parse/parse.h>  @interface restocardconfirmationviewcontroller : uiviewcontroller  @property(nonatomic) pfobject *commande; @property(nonatomic) nsmutablearray *boxescommande;  - (ibaction)confirmer:(id)sender; @end 

you should initialise array before using it. this

- (void)awakefromnib {    // initialization code    _restocardconfirmationvc = [[restocardconfirmationviewcontroller alloc] init];    _restocardconfirmationvc.boxescommande = [nsmutablearray array]; } 

although bad approach. should initialise array in restocardconfirmationviewcontroller initialisation.