Cocos2d-x中的CCObject类及其派生类，使用autorelease()方法，将自身交托于CCPoolManager管理器进行管理，都可以使用retain()方法来使自身的引用计数加一，使用release()方法来使自身的引用计数减一，当引用计数为0的时候，CCPoolManager管理器就会将其删除释放。
类
所有实例化Cocos2d-x里面的以CCObject为基类的类时，都要使用其create()方法来创建对象，对于自己添加的派生类，需要通过CREATE_FUNC宏来实现create()方法，下面以《如何制作一个横版格斗过关游戏 Cocos2d-x 2.0.4》来举例介绍：
Hero.h
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| class Hero : public ActionSprite
{
public:
Hero(void);
~Hero(void);
CREATE_FUNC(Hero);
//……
}; |
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| #define CREATE_FUNC(__TYPE__) \
static __TYPE__* create() \
{ \
__TYPE__ *pRet = new __TYPE__(); \
if (pRet && pRet->init()) \
{ \
pRet->autorelease(); \
return pRet; \
} \
else \
{ \
delete pRet; \
pRet = NULL; \
returnNULL; \
} \
} |
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| class SimpleDPad : public cocos2d::CCSprite, public cocos2d::CCTargetedTouchDelegate
{
public:
SimpleDPad(void);
~SimpleDPad(void);
static SimpleDPad* dPadWithFile(cocos2d::CCString *fileName, float radius);
bool initWithFile(cocos2d::CCString *filename, float radius);
//……
}; |
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| SimpleDPad* SimpleDPad::dPadWithFile(CCString *fileName, float radius)
{
SimpleDPad *pRet = new SimpleDPad();
if (pRet && pRet->initWithFile(fileName, radius))
{
pRet->autorelease();
return pRet;
}
else
{
delete pRet;
pRet = NULL;
returnNULL;
}
} |
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| class GameLayer : public cocos2d::CCLayer, public SimpleDPadDelegate
{
public:
GameLayer(void);
~GameLayer(void);
CREATE_FUNC(GameLayer);
//……
CC_SYNTHESIZE_RETAIN(cocos2d::CCArray*, _robots, Robots);
}; |
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| GameLayer::GameLayer(void)
{
//……
_robots = NULL;
}
GameLayer::~GameLayer(void)
{
//……
CC_SAFE_RELEASE_NULL(_robots);
} |
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| class ActionSprite : public cocos2d::CCSprite
{
public:
ActionSprite(void);
~ActionSprite(void);
//……
CC_SYNTHESIZE_RETAIN(cocos2d::CCAction*, _attackAction, AttackAction);
}; |
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| bool Hero::init()
{
bool bRet = false;
do
{
//……
this->setAttackAction(CCSequence::create(CCAnimate::create(attackAnimation), CCCallFunc::create(this, callfunc_selector(Hero::idle)), NULL));
//……
} while (0);
return bRet;
} |
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| CCCallFunc * CCCallFunc::create(CCObject* pSelectorTarget, SEL_CallFunc selector)
{
CCCallFunc *pRet = new CCCallFunc();
if (pRet && pRet->initWithTarget(pSelectorTarget)) {
pRet->m_pCallFunc = selector;
pRet->autorelease();
return pRet;
}
CC_SAFE_DELETE(pRet);
returnNULL;
}
bool CCCallFunc::initWithTarget(CCObject* pSelectorTarget) {
if (pSelectorTarget)
{
pSelectorTarget->retain();
}
if (m_pSelectorTarget)
{
m_pSelectorTarget->release();
}
m_pSelectorTarget = pSelectorTarget;
returntrue;
} |
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| virtual ~CCCallFunc()
{
CC_SAFE_RELEASE(m_pSelectorTarget);
} |
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| class ActionSprite : public cocos2d::CCSprite
{
public:
//……
virtual void cleanup();
}; |
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| void ActionSprite::cleanup()
{
CC_SAFE_RELEASE_NULL(_idleAction);
CC_SAFE_RELEASE_NULL(_attackAction);
CC_SAFE_RELEASE_NULL(_walkAction);
CC_SAFE_RELEASE_NULL(_hurtAction);
CC_SAFE_RELEASE_NULL(_knockedOutAction);
CCSprite::cleanup();
} |