simple implementation for a delegate on a view controller

delegate.h

#import <UIKit/UIKit.h>

@class SomeViewController;

@protocol SomeViewControllerDelegate <NSObject>

-(void)delegateMethodName: (SomeViewController *) controller;

@end
@interface SomeViewController : UIViewController

@property (nonatomic, weak) id<GFNewUserDelegate> delegate;

@end

delegate.m

#import "delegate.h"

@interface SomeViewController ()
@end

@implementation SomeViewController

- (void) someMethodToCallDelegate {
   [self.delegate delegateMethodName:self];
}

@end

delegateUser.m

#import "delegate.h"

@interface SomeDelegateUser ()
<SomeViewControllerDelegate>
@end

@implementation SomeDelegateUser

- (void) variousFoo {
   SomeViewController *controler = [[SomeViewController alloc] init];
   controller.delegate = self;
}

-(void)delegateMethodName: (SomeViewController *) controller {
   // handle the delegate being called here
}

@end