Hard-coding seed data is quick and easy, but it's not my preferred solution. Loading seed data from a file is a strategy I like more. The idea is simple. You include a file with seed data in the application bundle. The file is loaded at runtime and its contents parsed. The contents is used to seed the persistent store with data.
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Seeding a Core Data Persistent Store
Loading Seed Data From a File
by Bart Jacobs in Core Data
5 Loading Seed Data From a File