原始文章地址：http://www.jb51.cc/article/p-zqlfzpgw-bbv.html

// 通过plist载入缓存@H_301_5@
CCSpriteFrameCache::sharedSpriteFrameCache@H_301_5@()->@H_301_5@addSpriteFramesWithFile("test.plist"@H_301_5@);
// 通过缓存载入sprite@H_301_5@
CCSprite*@H_301_5@ sp =@H_301_5@ CCSprite::createWithSpriteFrameName@H_301_5@("test01.png"@H_301_5@);

以上2句代码，可以通过plist创建一个sprite，简单分析下过程。

通过plist载入缓存
首先是通过plist载入缓存，跟踪到源码看到如下片段：

void@H_301_5@ CCSpriteFrameCache::addSpriteFramesWithFile@H_301_5@(const char *@H_301_5@pszPlist)
{
    CCAssert(pszPlist,"plist filename should not be NULL"@H_301_5@);
    // 判断是否加载过该文件 如果没加载过，才做以下这些事情@H_301_5@
    if@H_301_5@ (m_pLoadedFileNames->@H_301_5@find(pszPlist) ==@H_301_5@ m_pLoadedFileNames->@H_301_5@end())
    {
    // 获取完整路径名，创建dict@H_301_5@
        std::string@H_301_5@ fullPath =@H_301_5@ CCFileUtils::sharedFileUtils@H_301_5@()->@H_301_5@fullPathForFilename(pszPlist);
        CCDictionary *@H_301_5@dict =@H_301_5@ CCDictionary::createWithContentsOfFileThreadSafe@H_301_5@(fullPath.@H_301_5@c_str());

        string@H_301_5@ texturePath(""@H_301_5@);
    // 尝试获取textureFileName，如果需要指定，格式大概长这样：@H_301_5@
    // <key>Metadata</key>@H_301_5@
    // <dict>@H_301_5@
    // <key>textureFileName</key>@H_301_5@
    // <string>tex.png</string>@H_301_5@
    // </dictt>@H_301_5@
    // 指定载入tex.png@H_301_5@
        CCDictionary*@H_301_5@ MetadataDict =@H_301_5@ (CCDictionary*@H_301_5@)dict->@H_301_5@objectForKey("Metadata"@H_301_5@);
        if@H_301_5@ (MetadataDict)
        {
            // try to read texture file name from Meta data@H_301_5@
            texturePath =@H_301_5@ MetadataDict->@H_301_5@valueForKey("textureFileName"@H_301_5@)->@H_301_5@getCString();
        }
    // 如果有指定tex文件，则直接查找完整路径@H_301_5@
        if@H_301_5@ (!@H_301_5@ texturePath.@H_301_5@empty())
        {
            // build texture path relative to plist file@H_301_5@
            texturePath =@H_301_5@ CCFileUtils::sharedFileUtils@H_301_5@()->@H_301_5@fullPathFromRelativeFile(texturePath.@H_301_5@c_str(),pszPlist);
        }
        else@H_301_5@    // 没有指定tex文件，载入plist对应的png，比如plist文件名：abc.plist，则载入的png为：abc.png@H_301_5@
        {
            // build texture path by replacing file extension@H_301_5@
            texturePath =@H_301_5@ pszPlist;

            // remove .xxx@H_301_5@
            size_t startPos =@H_301_5@ texturePath.@H_301_5@find_last_of("."@H_301_5@); 
            texturePath =@H_301_5@ texturePath.@H_301_5@erase(startPos);

            // append .png@H_301_5@
            texturePath =@H_301_5@ texturePath.@H_301_5@append(".png"@H_301_5@);

            CCLOG("cocos2d: CCSpriteFrameCache: Trying to use file %s as texture"@H_301_5@,texturePath.@H_301_5@c_str());
        }
    // 载入图片@H_301_5@
        CCTexture2D *@H_301_5@pTexture =@H_301_5@ CCTextureCache::sharedTextureCache@H_301_5@()->@H_301_5@addImage(texturePath.@H_301_5@c_str());

        if@H_301_5@ (pTexture)
        {
        // 载入spriteFrames@H_301_5@
            addSpriteFramesWithDictionary(dict,pTexture);
            m_pLoadedFileNames->@H_301_5@insert(pszPlist);
        }
        else@H_301_5@
        {
            CCLOG("cocos2d: CCSpriteFrameCache: Couldn't load texture"@H_301_5@);
        }

        dict->@H_301_5@release();
    }

}

然后到了这里：

void CCSpriteFrameCache::addSpriteFramesWithDictionary(CCDictionary* dictionary,CCTexture2D *pobTexture)
{
/*
// format 4种格式支持
Supported Zwoptex Formats:

ZWTCoordinatesFormatOptionXMLLegacy = 0,// Flash Version
ZWTCoordinatesFormatOptionXML1_0 = 1,// Desktop Version 0.0 - 0.4b
ZWTCoordinatesFormatOptionXML1_1 = 2,// Desktop Version 1.0.0 - 1.0.1
ZWTCoordinatesFormatOptionXML1_2 = 3,// Desktop Version 1.0.2+
*/
// 分离2个dict
CCDictionary *MetadataDict = (CCDictionary*)dictionary->objectForKey("Metadata");
CCDictionary *framesDict = (CCDictionary*)dictionary->objectForKey("frames");
int format = 0;
// 从Metadata获取格式 默认为0
if(MetadataDict != NULL) 
{
    format = MetadataDict->valueForKey("format")->intValue();
}
// 检测format 支持0-3
CCAssert(format >=0 && format <= 3,"format is not supported for CCSpriteFrameCache addSpriteFramesWithDictionary:textureFilename:");
// 遍历frames
CCDictElement* pElement = NULL;
CCDICT_FOREACH(framesDict,pElement)
{
    CCDictionary* frameDict = (CCDictionary*)pElement->getObject();
    std::string spriteFrameName = pElement->getStrKey();    // 取key作为sprite名
// 如果已经加载过 不再处理
    CCSpriteFrame* spriteFrame = (CCSpriteFrame*)m_pSpriteFrames->objectForKey(spriteFrameName);
    if (spriteFrame)
    {
        continue;
    }
// 根据format处理
    if(format == 0) 
    {
        float x = frameDict->valueForKey("x")->floatValue();
        float y = frameDict->valueForKey("y")->floatValue();
        float w = frameDict->valueForKey("width")->floatValue();
        float h = frameDict->valueForKey("height")->floatValue();
        float ox = frameDict->valueForKey("offsetX")->floatValue();
        float oy = frameDict->valueForKey("offsetY")->floatValue();
        int ow = frameDict->valueForKey("originalWidth")->intValue();
        int oh = frameDict->valueForKey("originalHeight")->intValue();
        // check ow/oh
        if(!ow || !oh)
        {
            CCLOGWARN("cocos2d: WARNING: originalWidth/Height not found on the CCSpriteFrame. AnchorPoint won't work as expected. Regenrate the .plist");
        }
        // abs ow/oh
        ow = abs(ow);
        oh = abs(oh);
        // create frame
        spriteFrame = new CCSpriteFrame();
    // 对照一下，大概就明白了
    // initWithTexture(CCTexture2D* pobTexture,const CCRect& rect,bool rotated,const CCPoint& offset,const CCSize& originalSize)
        spriteFrame->initWithTexture(pobTexture,CCRectMake(x,y,w,h),false,CCPointMake(ox,oy),CCSizeMake((float)ow,(float)oh)
                                    );
    } 
...// 以下类似

    // 加入缓存，名字用spriteFrameName <span style="font-family: Arial,Helvetica,sans-serif;"> m_pSpriteFrames是一个dict</span>
    m_pSpriteFrames->setObject(spriteFrame,spriteFrameName);
    spriteFrame->release();
}

}

于是，这部分的大概流程就是：
载入plist，载入texture，根据plist选择texture的区域，载入spriteFrame，加入到缓存。

通过缓存载入sprite

CCSprite* CCSprite::createWithSpriteFrameName(const@H_301_5@ char@H_301_5@ *pszSpriteFrameName)
{
    // 从缓存里取对应名字的spriteFrame@H_301_5@
    CCSpriteFrame *pFrame = CCSpriteFrameCache::sharedSpriteFrameCache()->spriteFrameByName(pszSpriteFrameName);

#if@H_301_5@ COCOS2D_DEBUG > 0@H_301_5@
    char@H_301_5@ msg[256@H_301_5@] = {0@H_301_5@};
    sprintf(msg,"Invalid spriteFrameName: %s"@H_301_5@,pszSpriteFrameName);
    CCAssert(pFrame != NULL,msg);
#endif@H_301_5@@H_301_5@

    return@H_301_5@ createWithSpriteFrame(pFrame);
}