cocos2d-x学习笔记(14)--CCTextureCache

   这里我直接根据一段代码来解释CCTextureCache，代码如下：
...........................
CCSprite* sprite = CCSprite::spriteWithFile("player.png");
addChild(sprite);
......................
这是我们初学者常用的载入精灵的使用方法，下面是用另一种方式：
........
CCTexture2D* cache = CCTextureCache::sharedTextureCache()->addImage("player.png");
...........
CCSprite* sprite = CCSprite::spriteWithTexture(cache);
addChild(sprite);
...........
可能有人会认为第二中方式是用效率比较高，其实是一样的，只是第二种方式比较灵活；在游戏中，如果一幅背景要载入许多精灵，如果是在切入背景是才开始载入精灵（即第一种使用方式），一旦精灵数量太庞大，那么画面就会出现卡顿的现象，玩家就会觉得游戏卡。如果我们采用第二种方式，在切入场景前，实现将图片加载到CCTextureCache中，那么在真正调用这些图片时就显得速度很快，就不会出现卡顿的现象。在这里，再说明的一点的是，所有加载图片的方法都是作为texture加载到CCTexureCache,不仅仅是CCSprite.下面我用一个实例来说明。
step1:创建cocos2d-win32项目，并命名为textureCache;
step2:在HelloWorldScene.h中添加下面两个类：
[cpp]
//第二种载入图片方式
class TextureCache:public CCLayer
{
protected:
    CCTexture2D* m_cache[20];
public:
    TextureCache();
    void addSprite(CCObject* pSender);

};

//第一种载入图片方式
class SpriteLayer:public CCLayer
{
public:
    SpriteLayer();
};

step3:在HelloWorldScene.cpp中添加如下函数：
[cpp]
TextureCache::TextureCache()
{
    CCSize size = CCDirector::sharedDirector()->getWinSize();

    CCLabelTTF* label = CCLabelTTF::labelWithString("Click", "Arial", 30);
    CCMenuItemLabel* item = CCMenuItemLabel::itemWithLabel(label,
        this, menu_selector(TextureCache::addSprite));
    CCMenu* menu = CCMenu::menuWithItem(item);
    addChild(menu, 1);
    item->setPosition(ccp(200, 150));
    menu->setPosition(ccp(200, 150));

    //load textures

    m_cache[0] = CCTextureCache::sharedTextureCache()->addImage("Images/player1.png");
    m_cache[1] = CCTextureCache::sharedTextureCache()->addImage("Images/player2.png");
    m_cache[2] = CCTextureCache::sharedTextureCache()->addImage("Images/player3.png");
    m_cache[3] = CCTextureCache::sharedTextureCache()->addImage("Images/player4.png");
    m_cache[4] = CCTextureCache::sharedTextureCache()->addImage("Images/player5.png");
    m_cache[5] = CCTextureCache::sharedTextureCache()->addImage("Images/player6.png");
    m_cache[6] = CCTextureCache::sharedTextureCache()->addImage("Images/player7.png");
    m_cache[7] = CCTextureCache::sharedTextureCache()->addImage("Images/player8.png");
    m_cache[8] = CCTextureCache::sharedTextureCache()->addImage("Images/player9.png");
    m_cache[9] = CCTextureCache::sharedTextureCache()->addImage("Images/player10.png");
    m_cache[10] = CCTextureCache::sharedTextureCache()->addImage("Images/player11.png");
    m_cache[11] = CCTextureCache::sharedTextureCache()->addImage("Images/player12.png");
    m_cache[12] = CCTextureCache::sharedTextureCache()->addImage("Images/player13.png");
    m_cache[13] = CCTextureCache::sharedTextureCache()->addImage("Images/player14.png");
    m_cache[14] = CCTextureCache::sharedTextureCache()->addImage("Images/player15.png");
    m_cache[15] = CCTextureCache::sharedTextureCache()->addImage("Images/player16.png");
    m_cache[16] = CCTextureCache::sharedTextureCache()->addImage("Images/player17.png");
    m_cache[17] = CCTextureCache::sharedTextureCache()->addImage("Images/player18.png");
    m_cache[18] = CCTextureCache::sharedTextureCache()->addImage("Images/player19.png");
    m_cache[19] = CCTextureCache::sharedTextureCache()->addImage("Images/player20.png");

}

void TextureCache::addSprite(CCObject* pSender)
{
    CCSize size = CCDirector::sharedDirector()->getWinSize();

    //add sprites
    CCSprite* background = CCSprite::spriteWithFile("HelloWorld.png");
    background->setPosition(ccp(size.width / 2, size.height / 2));

    CCSprite* s1 = CCSprite::spriteWithTexture(m_cache[0]);
    CCSprite* s2 = CCSprite::spriteWithTexture(m_cache[1]);
    CCSprite* s3 = CCSprite::spriteWithTexture(m_cache[2]);
    CCSprite* s4 = CCSprite::spriteWithTexture(m_cache[3]);
    CCSprite* s5 = CCSprite::spriteWithTexture(m_cache[4]);
    CCSprite* s6 = CCSprite::spriteWithTexture(m_cache[5]);
    CCSprite* s7 = CCSprite::spriteWithTexture(m_cache[6]);
    CCSprite* s8 = CCSprite::spriteWithTexture(m_cache[7]);
    CCSprite* s9 = CCSprite::spriteWithTexture(m_cache[8]);
    CCSprite* s10 = CCSprite::spriteWithTexture(m_cache[9]);
    CCSprite* s11 = CCSprite::spriteWithTexture(m_cache[10]);
    CCSprite* s12 = CCSprite::spriteWithTexture(m_cache[11]);
    CCSprite* s13 = CCSprite::spriteWithTexture(m_cache[12]);
    CCSprite* s14 = CCSprite::spriteWithTexture(m_cache[13]);
    CCSprite* s15 = CCSprite::spriteWithTexture(m_cache[14]);
    CCSprite* s16 = CCSprite::spriteWithTexture(m_cache[15]);
    CCSprite* s17 = CCSprite::spriteWithTexture(m_cache[16]);
    CCSprite* s18 = CCSprite::spriteWithTexture(m_cache[17]);
    CCSprite* s19 = CCSprite::spriteWithTexture(m_cache[18]);
    CCSprite* s20 = CCSprite::spriteWithTexture(m_cache[19]);

    s1->setPosition(ccp(50, 50));
    s2->setPosition(ccp(60, 50));
    s3->setPosition(ccp(70, 50));
    s4->setPosition(ccp(80, 50));
    s5->setPosition(ccp(90, 50));
    s6->setPosition(ccp(100, 50));
    s7->setPosition(ccp(110, 50));
    s8->setPosition(ccp(120, 50));
    s9->setPosition(ccp(130, 50));&n

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