xcode - Trouble saving segmented control with core data -

i thought issue simple 1 on come, it's providing little harder , frustrating.

i'm using uisegmentedcontrol make selection , saved core data nsnumber entity. unfortunately when try convert integer segment control nsnumber, comes (null). below sample code of problem.

//  viewcontroller.h  #import <uikit/uikit.h> #import "object.h"  @interface viewcontroller : uiviewcontroller  @property (weak, nonatomic) iboutlet uisegmentedcontrol *segmentoutlet;  @property (strong, nonatomic) object *currentobject;  //core data object entity named subobject nsnumber  - (ibaction)segmentcontrolselected:(id)sender;  @end  //viewcontroller.m  -(ibaction)segmentcontrollerselected     {     [self.segmentoutlet selectedsegmentindex]  // segment control     currentobject.subobject = [nsnumber numberwithint:([self.segmentoutlet selectsegmentindex]); nslog(@"the object number %@", currentobject.subobject);        } 

the nslog %@ result (null), i'm not sure how correct this.

i've started learn programming, it's basic rookie mistake. help

your segmentoutlet needs specified strong. memory system discarding @ point; then, when try self.segmentoutlet return value nil. after invoking selectsegmentindex fails and, default, returns nil , 'null'. try:

@property (strong, nonatomic) iboutlet uisegmentedcontrol *segmentoutlet;