Post date: Jul 25, 2013 6:38:55 AM
I guess below link would be the best tutorial about the custom iOS framework creation
http://spin.atomicobject.com/2011/12/13/building-a-universal-framework-for-ios/
For Core Data vs Manual CRUD operation:
https://blog.stackmob.com/2012/11/iphone-database-tutorial-part-1-learning-core-data/