CoreData

Transcript

1. Core Data By Emil Marashliev @emarashliev emarashliev.com Wednesday, February 27, 13
2. Basic Core Data Wednesday, February 27, 13
3. What is Core Data? ✤Object graph ✤Data persistence framework ✤Not a data base Wednesday, February 27, 13
4. Model View Controller Core Data == Part of the Model Wednesday, February 27, 13
5. Core Data Layers Wednesday, February 27, 13
6. Persistent Store ✤NSPersistentSore ✤Store types: XML (OS X only), SQLite, Memory, Binary ✤Custom Stores ✤Incremental Stores and Atomic Store ✤NSIncrementalStore Wednesday, February 27, 13
7. Persistent Store Coordinator ✤NSPersistentStoreCoordinator ✤Associate persistent stores with a model ✤Between the persistent store and MOC ✤Save object graphs to persistent storage ✤Retrieve model information ✤Context can NOT exist without coordinator Wednesday, February 27, 13
8. Managed Object Model ✤NSManagedObjectModel ✤Xcode visual tool Wednesday, February 27, 13
9. Managed Object Model - Visually Wednesday, February 27, 13
10. Managed Object Model - Visually Wednesday, February 27, 13
11. Entities ✤NSEntityDescription ✤Represent Objects ✤Have attributes (numbers, strings, binary and etc.) ✤Can have relationships (to-one, to-many) Wednesday, February 27, 13
12. Managed Object Context ✤NSManagedObjectContext ✤Manage a collection of managed objects ✤Changes aren’t saved until calling save: ✤Check for errors! ✤A context for each thread Wednesday, February 27, 13
13. Managed Object ✤NSManagedObject ✤Represent entities ✤Superclass of all managed objects ✤It is not possible to use direct instance ✤Properties can be accessed via KVO/KVC ✤Pass object between threads via objectID Wednesday, February 27, 13
14. Fetching Objects ✤NSFetchRequest ✤Retrieve objects from store ✤Have predicates for query (NSPredicate) Wednesday, February 27, 13
15. Muti Thread Core Data Multi-Context Core Data Wednesday, February 27, 13
16. Single-context Wednesday, February 27, 13
17. The “Traditional” Multi-Context Wednesday, February 27, 13
18. Parent/Child Contexts ✤Require iOS 5 Wednesday, February 27, 13
19. Asynchronous Save Wednesday, February 27, 13
20. Questions ??? Wednesday, February 27, 13
21. Thank You !!! Wednesday, February 27, 13