Retired Document
Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.
Hands-On Examples/Example 3 - Using Core Data with a Simple Cocoa View/CoreRecipesCocoaView-Begin/Sources/CoreRecipesController.m
#import "CoreRecipesController.h" |
@implementation CoreRecipesController |
// Build the managed object model from the compiled data models in our bundle |
- (NSManagedObjectModel *)managedObjectModel { |
if (managedObjectModel) return managedObjectModel; |
NSBundle *mainBundle = [NSBundle mainBundle]; |
managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:[NSArray arrayWithObject:mainBundle]] retain]; |
return managedObjectModel; |
} |
// Return our managed object context, first setting up the persistence stack if needed |
- (NSManagedObjectContext *)managedObjectContext { |
NSError *error; |
NSURL *url; |
NSPersistentStoreCoordinator *coordinator; |
if (managedObjectContext) { |
return managedObjectContext; |
} |
// This example uses a prepared store file which is in the app's bundle and is opened read-only |
NSBundle *mainBundle = [NSBundle mainBundle]; |
NSString *storePath = [mainBundle pathForResource:@"CoreRecipesCocoaView" ofType:@"xml"]; |
NSAssert(nil != storePath, @"No store file found in application bundle."); |
url = [NSURL fileURLWithPath:storePath]; |
coordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]]; |
NSDictionary *storeOptionsDict = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:NSReadOnlyPersistentStoreOption]; |
if ([coordinator addPersistentStoreWithType:NSXMLStoreType configuration:nil URL:url options:storeOptionsDict error:&error]){ |
managedObjectContext = [[NSManagedObjectContext alloc] init]; |
[managedObjectContext setPersistentStoreCoordinator: coordinator]; |
} else { |
[[NSApplication sharedApplication] presentError:error]; |
} |
[coordinator release]; |
return managedObjectContext; |
} |
// Populate our array controller's array of recipes with all the recipes in the store |
- (void)populateRecipes |
{ |
[recipes release]; |
/* |
NSManagedObjectContext *context = [self managedObjectContext]; |
NSFetchRequest *recipeFetch = [[[NSFetchRequest alloc] init] autorelease]; |
NSEntityDescription *recipeEntity = [NSEntityDescription entityForName:@"Recipe" inManagedObjectContext:context]; |
[recipeFetch setEntity:recipeEntity]; |
*/ |
/* |
NSError *fetchError; |
recipes = [NSMutableArray arrayWithArray:[context executeFetchRequest:recipeFetch error:&fetchError]]; |
NSAssert(nil != recipes, ([NSString stringWithFormat:@"Recipe fetch returned error:%@", fetchError])); |
*/ |
[recipes retain]; |
} |
// TableView datasource methods |
- (int)numberOfRowsInTableView:(NSTableView *)aTableView |
{ |
/* |
if (nil == recipes) { |
[self populateRecipes]; |
} |
return [recipes count]; |
*/ |
} |
- (id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(int)rowIndex |
{ |
/* |
if (nil == recipes) { |
[self populateRecipes]; |
} |
id columnIdentifier = [aTableColumn identifier]; |
NSAssert(rowIndex >= 0 && rowIndex < [recipes count], @"Invalid row index for tableview datasource"); |
return [[recipes objectAtIndex:rowIndex] valueForKeyPath:columnIdentifier]; |
*/ |
} |
// Delete a recipe from our context |
- (IBAction)deleteRecipe:(id)sender |
{ |
/* |
int selectedRow = [recipeTable selectedRow]; |
if (-1 == selectedRow) { // No row selected |
NSBeep(); |
} else { |
NSAssert(selectedRow >= 0 && selectedRow < [recipes count], @"Row selected in table view does not exist in recipes"); |
NSManagedObject *recipeToDelete = [recipes objectAtIndex:selectedRow]; |
[[self managedObjectContext] deleteObject:recipeToDelete]; |
[recipes removeObjectAtIndex:selectedRow]; |
[recipeTable reloadData]; |
} |
*/ |
} |
@end |
/* |
File: CoreRecipesController.m |
Abstract: Main controller class for the application |
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*/ |
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