A CoreData Journey, presentation given at CodeCamp on 10 Mai 2014.

1. A Core Data Journey

2. Who Am I?
• Alex Terente
• Mainly iOS developer
• Consultant and working @
TAGonSoft
• alex.terente@TAGonSoft.ro

3. What is Core Data?
“The Core Data framework
provides generalized and
automated solutions to common
tasks associated with object life-
cycle and object graph
management, including
persistence.”

4. What is Core Data?
• Allows definition of Managed Objects
• Functionality to create, update,
delete, query
• Multiple back-end storage options

5. Storage Options
• Binary
• In-memory
• XML
• Not available on the iPhone
• SQLite
• Only option that does not require the
entire store to reside in memory

6. What is not Core
Data
• Core Data is not a relational
database or a relational database
management system
• Core Data is not a silver bullet.

7. Core Data vs. SQLite
SQLite Core Data
Bulk/Set
Operations
Yes No
Automatic object
population
No Yes
Custom SQL Yes No
Select only
certain fields
Yes No
Automated
Migrations
No Yes
Less Complex
Code
No Yes

8. Interface to Core
Data
NSPersistentStore
NSPersistentStoreCoordinator
NSManagedObjectContext

9. NSPersistentStoreCoordinat
or

10. NSManagedObjectModel

11. Model Demo

12. NSManagedObjectConte
xt

13. Inserting an Object

14. Querying for Objects

15. Deleting an Object

16. Updating an Object
• Same as insert
• Make changes followed by
ManagedObjectContext save

17. Save Context

18. Code Demo

19. Migration
• Lightweight Migration
• Model versioning

20. Lightweight migration
• Adding or removing entity, relation or
attribute
• Making attribute non optional
• Making non optional attribute
optional
• Renaming an atribute or entity

21. Lightweight migration

22. Model Versioning

23. Model Versioning

24. Model Versioning

25. Code Demo

26. Threading
• Must create a new
NSManagedObjectContext for each
thread
• NSManagedObjects are
associated with a particular context
• NSManagedObjectContext can be
updated with changes from other
contexts

27. Code Demo

28. Core Data and iCloud
• Enabling
• Add iCloud Persistent Store

29. Enabling iCloud

31. Enabling iCloud

32. iCloud Persistent
Store

33. Resources
• Core Data Programming Guide
• Core Data Model Versioning and
Data Migration
• iCloud Programming Guide for Core
Data
• iCloud Design Guide
• Code Sample
https://github.com/TAGonSoft/CoreD
ata_CodeCamp

34. Q & A

35. Thank You
Please feel the evaluation form
A Core Data Journey
Alex Terente
TAGonSoft.com