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#import "FruitStandh" #import "Crateh" @implementation FruitStand @dynamic standName; @dynamic crates; @end
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#import "Appleh" @implementation Apple @end
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"Orangeh" "FruitStandh" "Fruith" "Crateh" "Appleh"
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NSManagedObjects have no dealloc methods, as the Core Data framework manages their life cycle Core Data is also responsible for generating NSManagedObjects accessor methods at runtime
Try This
Adding Core Data to the Application s Code
1 Open FruitStand in Xcode, open FruitStandAppDelegateh, and import the Core Data
header file (Listing 17-4) Create a property called managedObjectContext for the NSManagedObjectContext class
2 Create a new method called loadCoreData and implement it (Listing 17-5) 3 Add code that calls the loadCoreData method in applicationDidFinishLaunching 4 Open FruitStandControllerh and import Core Data in FruitStandController s header
file Add a property referencing NSManagedObjectContext and name the property managedObjectContext (Listings 17-6 and 17-7)
5 Return to the applicationDidFinishLaunching method in FruitStandAppDelegatem and add
code that sets the FruitStandViewController s managedObjectContext property
6 Build the application
Listing 17-4
FruitStandAppDelegateh
#import <UIKit/UIKith> #import <CoreData/CoreDatah> @class FruitStandViewController;
(continued)
iPhone SDK Programming: A Beginner s Guide
@interface FruitStandAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; FruitStandViewController *viewController; NSManagedObjectContext * managedObjectContext; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet FruitStandViewController *viewController; @property (nonatomic, retain) NSManagedObjectContext * managedObjectContext; -(void) loadCoreData; @end
Listing 17-5
FruitStandAppDelegatem
#import "FruitStandAppDelegateh" #import "FruitStandViewControllerh" @implementation FruitStandAppDelegate @synthesize window; @synthesize viewController; @synthesize managedObjectContext; - (void) loadCoreData { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocument Directory, NSUserDomainMask, YES); NSString *basePath = ([paths count] > 0) [paths objectAtIndex:0] : nil; NSLog(@"%@", basePath); NSURL *storeUrl = [NSURL fileURLWithPath: [basePath stringByAppendingPathComponent: @"FruitStandsqlite"]]; NSError *error; NSPersistentStoreCoordinator * persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [NSManagedObjectModel mergedModelFromBundles:nil]]; if (![persistentStoreCoordinator addPersistentStoreWithType: NSSQLiteStoreType configuration:nil URL:storeUrl options:nil error:&error]) { NSLog(@"error loading persistent store"); } managedObjectContext = [[NSManagedObjectContext alloc] init]; [managedObjectContext setPersistentStoreCoordinator: persistentStoreCoordinator]; }
17:
Core Data
- (void)applicationDidFinishLaunching:(UIApplication *) application { [self loadCoreData]; viewControllermanagedObjectContext = selfmanagedObjectContext; [window addSubview:viewControllerview]; [window makeKeyAndVisible]; } - (void)dealloc { [viewController release]; [managedObjectContext release]; [window release]; [super dealloc]; } @end
Listing 17-6
FruitStandViewControllerh
#import <UIKit/UIKith> #import <CoreData/CoreDatah> @interface FruitStandViewController : UIViewController { NSManagedObjectContext * managedObjectContext; } @property (nonatomic, retain) NSManagedObjectContext * managedObjectContext; @end
Listing 17-7
FruitStandViewControllerm
#import "FruitStandViewControllerh" @implementation FruitStandViewController @synthesize managedObjectContext; - (void)dealloc { [managedObjectContext release]; [super dealloc]; } @end
This task s code should be straightforward The application s delegate, in application DidFinishLaunching, calls the loadCoreData method This method loads the model, obtains the persistent data store from the Documents folder (creating it if nonexistent), and then initializes a new context from the persistent store coordinator When the delegate loads FirstViewController, it also sets the view controller s context to the delegate s context FirstViewController can then use the context to add, edit, and delete NSManagedObjects
iPhone SDK Programming: A Beginner s Guide
Adding Objects
All objects managed by a managed object context are NSManagedObject instances An NSManagedObject is a class that implements the required behavior for a Core Data model object You do not create NSManagedObject instances, but rather subclasses These subclasses are usually created from the entities defined in an xcdatamodel file The easiest way to create a new managed object is through the NSEntityDescription s class method, insertNewObjectForEntityForName:inManagedObjectContext
+ (id)insertNewObjectForEntityForName:(NSString *) entityName inManagedObjectContext:(NSManagedObjectContext *) context
This method obtains an entity from the model, creates a new NSManagedObject based upon the entity, and inserts it in the current managed object context For instance, the following creates a new Apple from the Apple entity used in this chapter s Try This xcdatamodel file:
Apple * apple = (Apple *) [NSEntityDescription insertNewObjectForEntity ForName: @"Apple" inManagedObjectContext:selfmanagedObjectContext];
After inserting a new object, you can then set its properties, just as if it was a normal object The following code sets the newly created Apple s radius:
appleradius = [NSNumber numberWithFloat:(float) 24];
Saving Changes
An application s managed object context does not automatically save changes to a model s data You must manually save the context to persist changes For instance, when terminating an application, you might wish to check the context for changes and, if there were changes, save them
if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error])
The context saves changes using its save method This method persists the context s changes to its associated persistent data store The method takes an error as a parameter and returns a Boolean indicating success or failure
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