Drag a sprite attached to a body - cocos2d-iphone

Question

I have a CCSprite that is attached to body in a b2world .
When someone is touch it, i want to move it with the touch location.
With a regular sprite that works fine , but with a sprite that has a body- it does not .
it gets the touch but not move the sprite (the body follow the sprite or the opposite?)
How should i do that ? apply a force relative to the touch is a problem..
- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView: [touch view]];
//detect a touch ont the button
for (b2Body* b = world->GetBodyList(); b; b = b->GetNext())
{
CGPoint location=[[CCDirector sharedDirector] convertToGL: currentPosition];
CCSprite *tempSprite = (CCSprite *) b->GetUserData();
if( tempSprite.tag==2 )
{
if(CGRectContainsPoint([tempSprite boundingBox], location))
{
tempSprite.position=location;
NSLog(#"touched");
}
}
}
}

Answer 1

Try changing the position of the body using SetTransform function. I think it's looking something like:
- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView: [touch view]];
//detect a touch ont the button
for (b2Body* b = world->GetBodyList(); b; b = b->GetNext())
{
CGPoint location=[[CCDirector sharedDirector] convertToGL: currentPosition];
CCSprite *tempSprite = (CCSprite *) b->GetUserData();
if( tempSprite.tag==2 )
{
if(CGRectContainsPoint([tempSprite boundingBox], location))
{
b->SetTransform( b2Vec2( location.x/PTM_RATIO, location.y/PTM_RATIO ), 0 ); //change position of the body
NSLog(#"touched");
}
}
}
}
Don't forget, if you want to change body position apply force or set linear velocity you must use kinematic or dynamic body type.