iOS Development iOS Data Persistence

Question 1

Which iOS framework provides a key-value store for small amounts of persistent data?

Accepted Answer

UserDefaults

Answer

UserDefaults provides a simple interface for storing small pieces of data, such as user preferences, using key-value pairs.

Question 2

Where should sensitive data like passwords be stored on iOS?

Accepted Answer

Keychain

Answer

The iOS Keychain provides encrypted, hardware-backed storage specifically designed for sensitive credentials and tokens.

Question 3

What is Core Data's primary role in an iOS app?

Accepted Answer

Object graph management and persistence to SQLite or other stores

Answer

Core Data manages the model layer of an app as an object graph, persisting it to a SQLite store (by default) or in memory.

Question 4

Which class is the central object in a Core Data stack?

Accepted Answer

NSPersistentContainer

Answer

`NSPersistentContainer` encapsulates the Core Data stack setup, providing the managed object model, context, and persistent store coordinator.

Question 5

What is the purpose of NSManagedObjectContext in Core Data?

Accepted Answer

Acts as a scratchpad for creating, fetching, and saving managed objects

Answer

NSManagedObjectContext is an in-memory scratchpad where you work with managed objects; calling `save()` persists changes to the store.

iOS Development Practice Test