Wrong sprite moving when touched - iphone

Question

I have 20 sprites in my scene which I've added to a NSMutableArray. My problem is that when I drag one sprite over another, the other also moves. How do I restrict the movement of untouched sprites?
Please help me with code (I am new to Cocos2d).
if( (self=[super init])) {
collection=[[NSMutableArray alloc]init];
CCLayer *base=[CCSprite spriteWithFile:#"Base.png"];
base.position=ccp(512,384);
[self addChild:base];
x=0;
for(int i=1;i<=7;i++)
{
CCSprite *hole=[CCSprite spriteWithFile:#"ball.png"];
hole.position=ccp(140+x,318);
hole.tag=i;
[self addChild:hole];
hole.visible=YES;
[collection addObject:hole];
x=x+75;
}
self.isTouchEnabled=YES;
}
return self;
}
-(void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(#"count:%i",[collection count]);
UITouch *touch=[touches anyObject];
CGPoint location=[touch locationInView:[touch view]];
location=[[CCDirector sharedDirector]convertToGL:location];
location=[self convertToNodeSpace:location];
for(CCSprite *s in collection)
{
if(CGRectContainsPoint([s boundingBox], location))
s.position=ccp(location.x,location.y);
return;
}
}

Answer 1

You can do that:
Declare this in interface .h file
CCSprite *mSpriteOnHand;
CGPoint mLastPos;
Inside init assign it to nil.
mSpriteOnHand = nil;
In touchesBegan method check like this
- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *myTouch = [touches anyObject];
CGPoint location = [myTouch locationInView:[myTouch view]];
location = [[CCDirector sharedDirector] convertToGL:location];
for(CCSprite *s in collection)
{
if(CGRectContainsPoint([s boundingBox], location))
{
mLastPos = s.position;
s.position=ccp(location.x,location.y);
mSpriteOnHand = s;
break;
}
}
}
- (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch=[touches anyObject];
CGPoint location=[touch locationInView:[touch view]];
location=[[CCDirector sharedDirector]convertToGL:location];
location=[self convertToNodeSpace:location];
if(mSpriteOnHand)
{
mSpriteOnHand.position = location;
}
}
- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
if(mSpriteOnHand)
{
mSpriteOnHand.position = mLastPos;
mSpriteOnHand = nil;
}
}