JSTouchSprite.h

#import <Foundation/Foundation.h>
#import "cocos2d.h"

@protocol JSSpriteTouching
@optional
- (void)actOnTouch;
- (void)actOnTouchWithPosition:(CGPoint)pos;
@end

@interface JSTouchSprite : Sprite {
  BOOL tracked;
}

+ (NSMutableArray *)allSprites;
+ (void)track:(JSTouchSprite *)sprite;
+ (void)untrack:(JSTouchSprite *)sprite;
+ (BOOL)spriteWasTouchedAtPosition:(CGPoint)pos;
+ (JSTouchSprite *)spriteTouchedAtPosition:(CGPoint)pos;
+ (JSTouchSprite *)spriteWithTag:(int)tag;
- (CGRect)rect;

@end

JSTouchSprite.m

#import "JSTouchSprite.h"
@interface JSTouchSprite ()
@property (nonatomic, getter=isTracked) BOOL tracked;
@end

@implementation JSTouchSprite
@synthesize tracked;
static NSMutableArray *allSprites = nil;
+ (NSMutableArray *)allSprites {
  @synchronized(allSprites) {
    if (allSprites == nil)
      allSprites = [[NSMutableArray alloc] init];
    return allSprites;
  } return nil;
}

+ (void)track:(JSTouchSprite *)sprite {
  @synchronized(allSprites) {
    for (JSTouchSprite *obj in allSprites) {
      if (obj == sprite)
        return;
    }
    [[JSTouchSprite allSprites] addObject:sprite];
  }
}

+ (void)untrack:(JSTouchSprite *)sprite {
  @synchronized(allSprites) {
    [[JSTouchSprite allSprites] removeObject:sprite];
  }
}

+ (BOOL)spriteWasTouchedAtPosition:(CGPoint)pos {
  for (JSTouchSprite *obj in allSprites) {
    if (CGRectContainsPoint([obj rect], pos)
        && [obj isTracked])
      return YES;
  } return NO;
}

+ (JSTouchSprite *)spriteTouchedAtPosition:(CGPoint)pos {
  for (JSTouchSprite *obj in allSprites) {
    if (CGRectContainsPoint([obj rect], pos) && [obj isTracked])
      return obj;
  } return nil;
}

+ (JSTouchSprite *)spriteWithTag:(int)tag {
  for (JSTouchSprite *obj in allSprites) {
    if ([obj tag] == tag)
      return obj;
  } return nil;
}

- (id)init {
  self = [super init];
  if (self != nil) {
    [JSTouchSprite track:self];
    [self setTracked:YES];
  } return self;
}

- (CGRect)rect {
  float w = [self contentSize].width;
  float h = [self contentSize].height;
  CGPoint point = CGPointMake([self position].x - (w/2), [self position].y - (h/2));
  return CGRectMake(point.x, point.y, w, h);
}

- (void)dealloc {
  [JSTouchSprite untrack:self];
  [super dealloc];
}

@end