ios - My Delegate method is not getting Called -

i started learning objective-c, breaking head why below simple code protocols , delegates not working, please clarify me why delegate method not getting called. in advance.

viewcontroller.h

#import <uikit/uikit.h> #include "secondviewcontroller.h"  @interface viewcontroller : uiviewcontroller<converterdelegate>  @property (strong,nonatomic) secondviewcontroller *secondview;  @property (strong, nonatomic) iboutlet uilabel *msgtext;  @property (strong, nonatomic) iboutlet uibutton *converbutton;  @end 

viewcontroller.m

#import "viewcontroller.h" #import "secondviewcontroller.h"  @interface viewcontroller ()  @end  @implementation viewcontroller @synthesize msgtext,converbutton,secondview;  - (void)viewdidload {     [super viewdidload];      self.secondview=[[secondviewcontroller alloc]init];     secondview.delegate=self; }  - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }   -(void)converttofahrenheit:(int)celsius{      float fah = ((1.8)*celsius)+32;     msgtext.text = [nsstring stringwithformat:@"the %i deg celsius             equal %.2f fah",celsius,fah]; } @end 

secondviewcontroller.h

#import <uikit/uikit.h>  @protocol converterdelegate <nsobject> @required -(void)converttofahrenheit:(int)celsius; @end  @interface secondviewcontroller : uiviewcontroller  @property (nonatomic, assign) id <converterdelegate> delegate;  @property (strong, nonatomic) iboutlet uitextfield *textfield; - (ibaction)convert:(id)sender;  @end 

secondviewcontroller.m

#import "secondviewcontroller.h"  @interface secondviewcontroller ()  @end  @implementation secondviewcontroller @synthesize textfield,delegate;  - (void)viewdidload {     [super viewdidload];     // additional setup after loading view. }      - (ibaction)convert:(id)sender {     [delegate converttofahrenheit:[textfield.text intvalue]];     //[self dismissviewcontrolleranimated:yes completion:nil]; } @end 

i totally confused why delegate method not getting called. newbie objective c please me.

i hope following code fulfil requirements.

viewcontroller.h

#import <uikit/uikit.h> #import "calculation.h"  @interface viewcontroller : uiviewcontroller<calculationdelegate>  @property (weak, nonatomic) iboutlet uilabel *msgtext; @property (weak,nonatomic) iboutlet uitextfield * inputfield; @property (weak, nonatomic) iboutlet uibutton *converbutton;  -(ibaction)convertmetod:(id)sender; @end 

viewcontroller.m

    #import "viewcontroller.h"  @interface viewcontroller ()  @end  @implementation viewcontroller  @synthesize msgtext,converbutton,inputfield;  - (void)viewdidload {     [super viewdidload]; }  -(ibaction)convertmetod:(id)sender {     calculation * calculationobj = [[calculation alloc] init];     calculationobj.delegate = self;     [calculationobj convertceltofaher:[inputfield.text intvalue]];  } -(void)showtheans:(nsstring *)ans {     nslog(@"delegate method called");     msgtext.text = ans; } - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }    @end 

calculation.h

 #import <foundation/foundation.h> @protocol calculationdelegate <nsobject> @required -(void) showtheans:(nsstring *) ans; @end  @interface calculation : nsobject @property (strong,nonatomic) id <calculationdelegate> delegate; -(void)convertceltofaher:(int)celsius; @end 

calculation.m

#import "calculation.h" @implementation calculation @synthesize delegate; -(void)convertceltofaher:(int)celsius {      float fah = ((1.8)*celsius)+32;      [delegate showtheans:[nsstring stringwithformat:@"the %i deg celsius             equal %.2f fah",celsius,fah]]; } @end