加载csd 时 plist 崩溃 查看了plist 中没有pixelFormat 字段
堆栈如下；
`std::__1::__hash_iterator<std::__1::__hash_node<std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, cocos2d::Texture2D::PixelFormat>, void*>*> std::__1::__hash_table<std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, cocos2d::Texture2D::PixelFormat>, std::__1::__unordered_map_hasher<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, cocos2d::Texture2D::PixelFormat>, std::__1::hash<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > >, true>, std::__1::__unordered_map_equal<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, cocos2d::Texture2D::PixelFormat>, std::__1::equal_to<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > >, true>, std::__1::allocator<std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, cocos2d::Texture2D::PixelFormat> > >::find<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > >(std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&) + 100
std::__1::__hash_iterator<std::__1::__hash_node<std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, cocos2d::Texture2D::PixelFormat>, void*>*> std::__1::__hash_table<std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, cocos2d::Texture2D::PixelFormat>, std::__1::__unordered_map_hasher<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, cocos2d::Texture2D::PixelFormat>, std::__1::hash<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > >, true>, std::__1::__unordered_map_equal<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, cocos2d::Texture2D::PixelFormat>, std::__1::equal_to<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > >, true>, std::__1::allocator<std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, cocos2d::Texture2D::PixelFormat> > >::find<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > >(std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&) + 44
cocos2d::SpriteFrameCache::addSpriteFramesWithDictionary(std::__1::unordered_map<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, cocos2d::Value, std::__1::hash<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > >, std::__1::equal_to<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > >, std::__1::allocator<std::__1::pair<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const, cocos2d::Value> > >&, std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&) + 440
cocos2d::SpriteFrameCache::addSpriteFramesWithFile(std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&) + 684
cocos2d::CSLoader::nodeWithFlatBuffersFile(std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&, std::__1::function<void (cocos2d::Ref*)> const&) + 412
cocos2d::CSLoader::createNodeWithFlatBuffersFile(std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&, std::__1::function<void (cocos2d::Ref*)> const&) + 20
cocos2d::CSLoader::createNodeWithFlatBuffersFile(std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&) + 48
cocos2d::CSLoader::createNode(std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > const&) + 324
lua_cocos2dx_csloader_CSLoader_createNode(lua_State*) + 236`