Cache Odata Offline mode iOS native application

Hi, guy

I am working on Offline Data SMP 3.0, i am saved Service Document and MetaData in cache already but, when turn off internet connection, I will read service document and metadata in cache but i can not get service document schema and metadata schema because entityType in service document and metadata are null, Please suggest me how to read service document and metadata in Cache on Offline Mode or give me some example.

Thank you

ServiceDocument and Metadata are stored but why has not entityTypes,.