cocos2d-x异步加载图片

1、将图片通过TexturePacker打包成plist和png或.pvr.ccz(加密)文件

2、将需要加载的图片路径存入集合paths中

3、 for(int i=0; i<paths.size(); i++){
Director::getInstance()->getTextureCache()->addImageAsync(paths[i]+".png",[=](Texture2D*){
SpriteFrameCache::getInstance()->addSpriteFramesWithFile(paths[i]+".plist");
_num++;
(_num== (paths.size()){
//loading finshed
}
});
}

4、从缓存图片中创建精灵

1）auto background = Sprite::createWithTexture(Director::getInstance()->getTextureCache()->getTextureForKey(bgName));(切成多块的背景，没有打包)

2）auto sprite= Sprite::createWithSpriteFrameName(spriteName);