Introduction To Core Data

Sep 3, 20092 likes1,358 views

Core Data is a framework for managing object graphs and object lifecycles in iOS and macOS apps. It includes classes like NSManagedObjectModel, NSManagedObjectContext, and NSPersistentStoreCoordinator that make up the Core Data stack. Developers can create managed object subclasses to define entities, attributes, and relationships to represent application data. Objects can be created, fetched from the persistent store, modified, and saved back using Core Data APIs. Relationships allow objects to reference each other, and faults improve performance by lazily loading related objects only when needed.

Sky+ Little Spender

Weather Maps Fourgy

Attributes
NSNumber
NSString Transformable
BOOL You put in code to
transform the
NSDate
object or value into
NSData a compatible type.
Transformable

Relationships

Properties that reference other objects
Can be to-one or to-many (NSSet - unordered)
Can (and should) have inverses, which are worked
out by Core Data when you set the other property
Delete rule ensures propagation

Relationships
DTAlbum
Attributes
DTArtist name
DTGenre Attributes discCount
Attributes name trackCount
name Relationships Relationships
Relationships albums artist
artists genres composers
songs songs songs

Core Data Stack
NSManagedObjectContext

NSPersistentStoreCoordinator NSPersistentStore

NSManagedObjectModel

Create and Save Objects
DTSong *song = [NSEntityDescription
insertNewObjectForEntityForName:@“DTSong”
inManagedObjectContext:managedObjectContext];

DTArtist *artist = [NSEntityDescription
insertNewObjectForEntityForName:@“DTArtist”
inManagedObjectContext:managedObjectContext];

artist.name = @“Moby”;

song.title = @“Porcelain”;

song.artist = artist;

•••

NSError *error = nil;
[managedObjectContext save:&error];

Create and Save Objects
NSManagedObjectContext
DTArtist
DTSong

NSPersistentStoreCoordinator NSPersistentStore

NSManagedObjectModel

Fetching Objects

All songs by “La Roux” sorted by title.

Entity DTSong

Predicate @“artist.name == %@”, @“La Roux”

Sorting @“title”

Fetching Objects

Fetch all playlists which contain more than an hour of music.

Entity DTPlaylist

Predicate @“@sum.songs.duration > 3600”

Sorting @“name”

Fetching Objects
NSEntityDescription *entity = [NSEntityDescription
entityForName:@“DTSong”
inManagedObjectContext:managedObjectContext];

NSPredicate *predicate = [NSPredicate
predicateWithFormat:@“artist.name == %@”, @“La Roux”];

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc]
initWithKey:@“title” ascending:YES];

NSArray *descriptors = [NSArray arrayWithObject:sortDescriptor];

NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:entity];
[request setPredicate:predicate];
[request setSortDescriptors:sortDescriptors];

NSArray *fetchResult = [managedObjectContext executeFetchRequest:request
error:&error];

Fetching Objects
NSManagedObjectContext NSFetchRequest
DTArtist DTSong
DTSong
DTSong DTSong

NSPersistentStoreCoordinator NSPersistentStore

DTSong
NSManagedObjectModel DTSong
DTSong

Performance: Faults
Faults are placeholders for related objects, which
mean you don’t use memory on unwanted objects.

DTSong
DTSong
DTArtist DTSong
DTSong
DTSong

Performance: Batching
DTArtist
DTArtist
Batching allows
you to bring only a DTArtist
subset of objects DTArtist
into memory.
DTArtist
DTArtist

DTMusicModel

hg.danieltull.co.uk/dtmusicmodel

DTGridView DTSwapView

hg.danieltull.co.uk/dtkit

Thank You
dt@danieltull.co.uk

hg.danieltull.co.uk

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Introduction To Core Data

1. Introduction to Core Data Daniel Tull

2. Sky+ Little Spender Weather Maps Fourgy

3. Core Data Stack NSManagedObjectModel

4. Managed Object Model

5. Attributes NSNumber NSString Transformable BOOL You put in code to transform the NSDate object or value into NSData a compatible type. Transformable

6. Relationships Properties that reference other objects Can be to-one or to-many (NSSet - unordered) Can (and should) have inverses, which are worked out by Core Data when you set the other property Delete rule ensures propagation

7. Relationships DTAlbum Attributes DTArtist name DTGenre Attributes discCount Attributes name trackCount name Relationships Relationships Relationships albums artist artists genres composers songs songs songs

8. Core Data Stack NSManagedObjectContext NSPersistentStoreCoordinator NSPersistentStore NSManagedObjectModel

9. Create and Save Objects DTSong *song = [NSEntityDescription insertNewObjectForEntityForName:@“DTSong” inManagedObjectContext:managedObjectContext]; DTArtist *artist = [NSEntityDescription insertNewObjectForEntityForName:@“DTArtist” inManagedObjectContext:managedObjectContext]; artist.name = @“Moby”; song.title = @“Porcelain”; song.artist = artist; ••• NSError *error = nil; [managedObjectContext save:&error];

10. Create and Save Objects NSManagedObjectContext DTArtist DTSong NSPersistentStoreCoordinator NSPersistentStore NSManagedObjectModel

11. Fetching Objects All songs by “La Roux” sorted by title. Entity DTSong Predicate @“artist.name == %@”, @“La Roux” Sorting @“title”

12. Fetching Objects Fetch all playlists which contain more than an hour of music. Entity DTPlaylist Predicate @“@sum.songs.duration > 3600” Sorting @“name”

13. Fetching Objects NSEntityDescription *entity = [NSEntityDescription entityForName:@“DTSong” inManagedObjectContext:managedObjectContext]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@“artist.name == %@”, @“La Roux”]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@“title” ascending:YES]; NSArray *descriptors = [NSArray arrayWithObject:sortDescriptor]; NSFetchRequest *request = [[NSFetchRequest alloc] init]; [request setEntity:entity]; [request setPredicate:predicate]; [request setSortDescriptors:sortDescriptors]; NSArray *fetchResult = [managedObjectContext executeFetchRequest:request error:&error];

14. Fetching Objects NSManagedObjectContext NSFetchRequest DTArtist DTSong DTSong DTSong DTSong NSPersistentStoreCoordinator NSPersistentStore DTSong NSManagedObjectModel DTSong DTSong

15. Performance: Faults Faults are placeholders for related objects, which mean you don’t use memory on unwanted objects. DTSong DTSong DTArtist DTSong DTSong DTSong

16. Performance: Batching DTArtist DTArtist Batching allows you to bring only a DTArtist subset of objects DTArtist into memory. DTArtist DTArtist

17. Demo

18. DTMusicModel hg.danieltull.co.uk/dtmusicmodel

19. DTGridView DTSwapView hg.danieltull.co.uk/dtkit

20. Thank You [email protected] hg.danieltull.co.uk

Introduction To Core Data

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