Question

I have a method call in a base class that looks like this:

#import <Foundation/Foundation.h>

@interface BaseController : NSObject

-(void)login;

@end

---

#import "BaseController.h"

@implementation BaseController

-(void)performTask
{
 return @"Base method loaded";
}


-(void)login
{
 [self performTask];
}


-(id)init
{
 if ((self = [super init]))
 {

 }

 return self;
}

-(void)dealloc
{
 [super dealloc];
}

@end

---

#import <Foundation/Foundation.h>
#import "BaseController.h"

@interface DerivedController : BaseController

-(void)performTask;

@end

---

#import "DerivedController.h"

@implementation DerivedController

-(void)performTask
{
 NSLog(@"Inherited method loaded.");
}

-(id)init
{
 if ((self = [super init])) { }

 return self;
}

-(void)dealloc
{
 [super dealloc];
}

@end

I would like to override the method performTask in a derived class and have the unchanged login method call the overridden method. This should be easy. What am I missing?

Answer 1

Just override performTask and the subclass instance will automatically use its own implementation when it receives the performTask message.