"CoreData tips &tricks" by Anton Fedorchenko

Since it's early release in iOS 3.2 CoreData has become one of the most challenging frameworks for iOS developers. Building the correct data model and it's efficient maintenance mechanisms are still key task to build powerful and performant app. CoreData is also on of the most criticized frameworks, especially after releasing competitors like Realm / Couchbase. Few tips & tricks to give your CoreData more power to compete will be revealed in this talk.
This talk was made for CocoaHeads Kyiv #10 which took place 10 Dec 2016.

Transcript

1. Core Data Tips & Tricks Anton Fedorchenko Senior iOS Engineer / TL, Lohika
2. Agenda • Core Data Introduction • What’s New in Core Data • Stack Setup • Demo • Debugging & Testing • Migration • Tips
3. Introduction • What’s Core Data
4. Introduction • What’s Core Data • Key features
5. Introduction • What’s Core Data • Key features • Faulting Deserts Appetizers Guacamole Ceviche Menu
6. Introduction • What’s Core Data • Key features • Faulting Deserts Appetizers Guacamole Ceviche Menu
7. Introduction • What’s Core Data • Key features • Faulting Deserts Appetizers Guacamole Ceviche Menu
8. Introduction • What’s Core Data • Key features • Faulting Deserts Appetizers Ceviche Menu
9. Introduction • What’s Core Data • Key features • Faulting Deserts Appetizers Menu
10. Introduction • What’s Core Data • Key features • Faulting • Attributes validation
11. Introduction • What’s Core Data • Key features • Faulting • Attributes validation • Schema migration
12. Introduction • What’s Core Data • Key features • Faulting • Attributes validation • Schema migration • Interface synchronization Model
13. Introduction • What’s Core Data • Key features • Faulting • Attributes validation • Schema migration • Interface synchronization • Sophisticated queries
14. Introduction • What’s Core Data • Key features • Why Core Data???
15. What’s New
16. What’s New • NSPersistentContainer
17. What’s New • NSPersistentContainer • Concurrency changes
18. What’s New
19. What’s New • NSPersistentContainer • Concurrency changes • Query generations for transient versioning
20. What’s New • NSPersistentContainer • Concurrency changes • Query generations for transient versioning • Xcode automatic subclass generation
21. What’s New • NSPersistentContainer • Concurrency changes • Query generations for transient versioning • Xcode automatic subclass generation • Finally added missed methods on NSManagedObject
22. What’s New • NSPersistentContainer • Concurrency changes • Query generations for transient versioning • Xcode automatic subclass generation • Finally added missed methods on NSManagedObject open class func entity() -> NSEntityDescription open class func fetchRequest() -> NSFetchRequest<NSFetchRequestResult> public convenience init(context moc: NSManagedObjectContext)
23. What’s New • NSPersistentContainer • Concurrency changes • Query generations for transient versioning • Xcode automatic subclass generation • Finally added missed methods on NSManagedObject and • Fetch convenience methods
24. What’s New func findAnimals() { context.performAndWait({ let request : NSFetchRequest<Animal> = Animal.fetchRequest do { let searchResults = try request.execute() // Use search results... } catch { print("Error with request: \(error)") } }) }
25. Stack Setup
26. Stack Setup NSManagedObjectModel
27. Stack Setup NSManagedObjectModel NSPersistentStoreCoordinator
28. Stack Setup NSManagedObjectModel NSPersistentStoreCoordinator NSManagedObjectContext
29. Stack Setup
30. Stack Setup Save Context
31. Stack Setup Main Context Save Context Parent/Child
32. Stack Setup Main Context Save Context Parent/Child
33. Stack Setup Main Context Save Context Parent/Child Edit Context Parent/Child Merge changes
34. Stack Setup NSManagedObjectModel NSPersistentStoreCoordinator NSManagedObjectContext
35. Stack Setup NSManagedObjectModel NSPersistentStoreCoordinator NSManagedObjectContext NSPersistentContainer
36. Stack Setup open var viewContext: NSManagedObjectContext { get } open func newBackgroundContext() -> NSManagedObjectContext open func performBackgroundTask(_ block: @escaping (NSManagedObjectContext) -> Swift.Void)
37. Demo
38. Debugging & Testing
39. Debugging & Testing • Multithreading assertions
40. Debugging & Testing • Multithreading assertions
41. Debugging & Testing • Multithreading assertions
42. Debugging & Testing • Multithreading assertions • SQL Debug
43. Debugging & Testing • Multithreading assertions • SQL Debug
44. Debugging & Testing • Multithreading assertions • SQL Debug 2012-01-19 20:31:37.864 ToDoSync[3455:fb03] CoreData: sql: SELECT 0, t0.Z_PK, t0.Z_OPT, t0.ZCOMPLETE, t0.ZCREATEDAT, t0.ZNOTE, t0.ZTITLE FROM ZTASK t0 ORDER BY t0.ZCREATEDAT LIMIT 1 2012-01-19 20:31:37.875 ToDoSync[3455:fb03] CoreData: annotation: sql connection fetch time: 0.0742s 2012-01-19 20:31:37.875 ToDoSync[3455:fb03] CoreData: annotation: total fetch execution time: 0.0784s for 1 rows.
45. Debugging & Testing • Multithreading assertions • SQL Debug • Migration debug -com.apple.CoreData.MigrationDebug
46. Debugging & Testing • Multithreading assertions • SQL Debug • Migration debug
47. Debugging & Testing • Multithreading assertions • SQL Debug • Migration debug • In-memory store
48. Migration
49. Migration • Lightweight
50. Migration • Lightweight • Heavyweight
51. Migration • Lightweight • Heavyweight
52. Tips please…
53. Tips please… #1 Stay up-to-date with your tools
54. Tips please… #1 Stay up-to-date with your tools #2 Adapt changes, be like water…
55. Tips please… #1 Stay up-to-date with your tools #2 Adapt changes, be like water… #3 Be bold, don’t be afraid of making mistakes
56. Tips please… #1 Stay up-to-date with your tools #2 Adapt changes, be like water… #3 Be bold, don’t be afraid of making mistakes #4 Do not judge based on someone’s opinion
57. Where to go next? WWDC 16 Session 242 What's New In Core Data