Interview guides / ios

Core Data Concurrency: iOS Interview Question

Core Data Concurrency interview question with a clear example answer for iOS engineers. Practice with AceMobileInterview.

This is a common iOS interview topic: Core Data Concurrency.

Below is a concise answer you can adapt in a real interview, then go deeper in the full AceMobileInterview track.

1. 1.Explain main vs private queue contexts and how you merge changes.

   Use viewContext on main; background contexts for imports. parent/child or persistent history / automaticallyMergesChangesFromParent. Never pass NSManagedObject across queues—pass objectIDs.