delegate not working

[schenker]

Hello, i have problem calling a method using delegate. Pls take a look at my simplified code and tell me what's wrong.

Protocol declaration file:

//  UpdateCurrentSumDelegate.h

#import <Foundation/Foundation.h>

@protocol UpdateCurrentSumDelegate <NSObject>

@required
-(void)UpdateCurrentSum;
@end

Header file of class that implements the protocol:

//  Cube1ViewController.h

#import "UpdateCurrentSumDelegate.h"

@interface Cube1ViewController : UIViewController <UpdateCurrentSumDelegate>{
    
    id <UpdateCurrentSumDelegate> delegate;
    
    Cube1ViewController *cube1vc;		
}

@property (nonatomic, assign) id delegate;

@end

Implementation file of class that implements the protocol:

//  Cube1ViewController.m

#import "Cube1ViewController.h"

@implementation Cube1ViewController

@synthesize delegate;

-(Cube1ViewController *)cube1vc {
    if (!cube1vc) 
    {
      cube1vc=[[Cube1ViewController alloc]init]; 
    }
    return cube1vc;
}


- (void)viewDidLoad {

     self.cube1vc.delegate = self;
    [self.delegate UpdateCurrentSum];
   }


-(void)UpdateCurrentSum {
    NSLog(@"this doesnt gets called by delegate!!!"); 
}

So, what is wrong? Pls help me. Thanks.

[Justinmichael]

From a quick glance at the code, you are setting the delegate on the var cubelvc and expecting it to call back in self. This almost would work but ultimately it is flawed. You've got a reference minefield going on here as you are creating a object with a reference to another of object of the same type and the order of viewDidLoad is throwing you so that the cube1vc object doesn't call the delegate after it has received it's delegate setup.

An overview of a simple delegate pattern:

ClassA.h

ClassA : NSObject <Delegate> {

    ClassB* b;

}

-----------
ClassA.m

- (id)init {
   ....
   b = [[ClassB alloc] init];
   b.delegate = self;[
  [b doSomething];
   ...
}

- (void)delegateCallBack {
   NSLog(@"here");
}

ClassB.h

id <Delegate> delegate;

@property .... delegate;

ClassB.m

@synthesize delegate;

-(void)doSomething {
    [delegate delegateCallBack];
}