#import "CCSprite.h"
@interface Square : CCSprite
@end

implementaion file

#import "Square.h"
#import "cocos2d.h"
@implementation Square
-(id)init {
    // Apple recommend assigning self with supers return value
    self = [super init];
    if (!self) return (nil);
    self.contentSize = [[CCDirector sharedDirector] viewSize];
    self.userInteractionEnabled = YES;
    return self;
}
-(void)touchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{
    CCLOG(@"touch received");
}
@end

- (id)init
{
    // Apple recommend assigning self with supers return value
    self = [super init];
    if (!self) return(nil);

    Square *_square = [[Square alloc] initWithImageNamed:@"background.png"];
    [_square setPosition:CGPointZero];
    [self addChild:_square];
    // done
return self;
}

- (id)initWithTexture:(CCTexture *)texture rect:(CGRect)rect rotated:(BOOL)rotated;

- (void)onEnter {
    [super onEnter];

    self.userInteractionEnabled = TRUE;
}