看了引用计数之后 那时好像懂了 今天突然想起一个问题：
Scene也是继承自Ref ，然后也是静态生成一个autorelease后的对象 那计数就变成1了
classCC_DLLScene:publicNode
{
public:
/** creates a new Scene object */
staticScene*create();
{
Scene *Scene::create()
{
Scene *ret =newScene();
if(ret && ret->init())
{
ret->autorelease();
returnret;
}
else
{
CC_SAFE_DELETE(ret);
returnnullptr;
}
}
}
}
intAPIENTRY_tWinMain(HINSTANCEhInstance,
HINSTANCEhPrevInstance,
LPTSTRlpCmdLine,
intnCmdShow)
{
returnApplication::getInstance()->run();
其中run(){
while(!glview->windowShouldClose())
{
QueryPerformanceCounter(&nNow);
if(nNow.QuadPart - nLast.QuadPart > _animationInterval.QuadPart)
{
nLast.QuadPart = nNow.QuadPart;
director->mainLoop();
其中mainLoop();
{
drawScene();
PoolManager::getInstance()->getCurrentPool()->clear();
for(constauto&obj : _managedObjectArray)
@H_502_421@ @H_502_421@{@H_502_421@ @H_502_421@obj->release();@H_502_421@ @H_502_421@ @H_502_421@}}glview->pollEvents();}elseSleep(0);}}}}
我们看到蓝色代码那里，PoolManager::getInstance()->getCurrentPool()->clear();Scene加入autorelease了 node继承的都加入了 Sprite也加入了 我们知道ref的构造函数是把引用计数自动变成1，那这里每一帧的绘画会把对象池里面的scene node sprite调用一次release 如果没有其他retain也就是变成0要回收了，但是不是这样的，实际还是可以显示出来的有两个地方 一个是scene的runWithScene一个是继承node的sprite这些等等
1、scene的runWithSceneboolAppDelegate::applicationDidFinishLaunching() {autodirector =Director::getInstance();autoglview = director->getOpenGLView();if(!glview) {glview =GLView::create("WeChat Airplane");glview->setFrameSize(600,800);director->setOpenGLView(glview);}director->setDisplayStats(true);director->setAnimationInterval(1.0 / 60);glview->setDesignResolutionSize(480,800,ResolutionPolicy::SHOW_ALL);this->setResourceSearchResolution();autoscene =WelcomeScene::create();director->runWithScene(scene);runWithScene(scene){pushScene(scene);{_scenesStack.pushBack(scene);{_data.push_back(object);object->retain();}}}returntrue;}
从上面的代码 我们可以看到最好还是retain了 所以scene是在mainloop里面的autoreleasepool减1 clear一次 但是他在_scenesStack retain了那么就不会被回收了 那所有的node其实都是添加到scene里面的，也就不会因为release Scene而导致node减1
2、继承node的sprite这些等等我们知道都要addChild的 layer也好 node也好 sprite也好 都是要加进去的voidNode::addChild(Node *child){CCASSERT( child !=nullptr,"Argument must be non-nil");this->addChild(child,child->_localZOrder,child->_tag);{voidNode::insertChild(Node*child,intz)@H_502_421@{@H_502_421@_transformUpdated =true;@H_502_421@_reorderChildDirty =true;@H_502_421@_children.pushBack(child);
voidpushBack(Tobject){CCASSERT(object !=nullptr,"The object should not be nullptr");_data.push_back(object);object->retain();}@H_502_421@child->_setLocalZOrder(z);@H_502_421@ @H_502_421@}
