iphone - Load UIViewController on another UIViewController in UIStoryboard from xib -

i have uiviewcontroller(say a). separate nib file loaded popup on view controller. when popup closed clicking uibutton, want load view controller(say b) in uistoryboard. uiviewcontrollers in storyboard.

i tried delegates pattern. delegate method returns self.storyboard nil.

please suggest how handle (either performsegue b or pushing new instance of b on navigation controller nib file)

here code used delegate:

**in customviewnewprescription.h file:**      @class customviewnewprescription;     @protocol customviewnewprescriptiondelegate <nsobject>     -(void)savecustomviewnewprescription;     @end      @interface customviewnewprescription : uiview{         id<customviewnewprescriptiondelegate>delegate;      }      @property(nonatomic,strong) id<customviewnewprescriptiondelegate>delegate;      **in .m:**     - (ibaction)btncancel:(uibutton *)sender{         [self.delegate savecustomviewnewprescription];     }  delegate synthesized , initialised.  **in addnewrx.h:** @interface addnewrx : uiviewcontroller<customviewnewprescriptiondelegate>{ }  **in addnewrx.m:**  -(void)savecustomviewnewprescription{    //either self performseguewithidentifier .... (or)     rxviewcontroller *obj1 = [[self.navigationcontroller storyboard] instantiateviewcontrollerwithidentifier:@"rxviewcontroller"];     [self.navigationcontroller pushviewcontroller:obj1 animated:yes]; } 

in savecustomviewnewprescription, self.storyboard giving nil values

please suggest how load view controller in savecustomviewnewprescription.

instead of:

rxviewcontroller *obj1 = [[self.navigationcontroller storyboard] instantiateviewcontrollerwithidentifier:@"rxviewcontroller"]; 

try:

uistoryboard *yourstoryboard = [uistoryboard storyboardwithname:@"mainstoryboard" bundle:nil]; rxviewcontroller *obj1 = [yourstoryboard instantiateviewcontrollerwithidentifier:@"rxviewcontroller"];