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iOS SDK Programming: A Beginner s Guide
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if (insertingGroup == YES) { // Delete the managed object for the given index path NSManagedObjectContext *context = selfgroupmanagedObjectContext; [context deleteObject:selfgroup]; // Save the deletion NSError *error = nil; if (![context save:&error]) { NSLog(@"Failed to save to data store: %@", [error localizedDescription]); NSArray* detailedErrors = [[error userInfo] objectForKey:NSDetailedErrorsKey]; if(detailedErrors != nil && [detailedErrors count] > 0) { for(NSError* detailedError in detailedErrors) { NSLog(@" DetailedError: %@", [detailedError userInfo]); } } else { NSLog(@" %@", [error userInfo]); } abort(); } } [selfnavigationController popViewControllerAnimated:YES]; } - (void)dealloc { [group release]; [nameField release]; [groupDescriptionField release]; [super dealloc]; } @end
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12 Finally, we need to modify insertNewObject in RootViewController and add a few lines at
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the end to push the group editing view when the user inserts a new group
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selfgroupEditorVCgroup = (AKCGroup *)newManagedObject; selfgroupEditorVCinsertingGroup = YES; [selfnavigationController pushViewController:selfgroupEditorVC animated:YES]; 13 When the user taps on a row in a UITableView, the didSelectRowAtIndexPath method is
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called Modify that method in RootViewController so that when the user taps on a group while in editing mode, the group editing view is also pushed
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- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath { AKCGroup *theGroup = [[self fetchedResultsController]
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objectAtIndexPath:indexPath]; if (selfediting == YES) { selfgroupEditorVCgroup = theGroup; selfgroupEditorVCinsertingGroup = NO; [selfnavigationController pushViewController: selfgroupEditorVC animated:YES]; } } 14 Save all of your changes and run the application When you put the group list into editing
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mode, you can now click a group to edit it When you create a new AKCGroup, you re now immediately taken to the edit view (Figure 17-10) You can polish the view layout and some of the settings like field capitalization, but at this point you have a fairly functional application for manipulating a list of AKC groups
Figure 17-10 Edit view for AKCGroup
iOS SDK Programming: A Beginner s Guide
Navigation
You now have a fairly complete application for displaying, adding, deleting, and editing a list of AKC groups But the groups alone aren t too interesting When the user taps on an AKC group while not in editing mode, she should see a new UITableView with all of the breeds within that group Then if she taps on a breed in that list, she should see a detailed view of the breed with a photo and description The UITableView with the list of breeds within a group is going to be very similar to the list of AKC groups, so for the Try This task in this section you can largely copy the code from RootViewController and AKCGroupViewController and we will only highlight the differences
Try This
Adding Navigation and Editing for a List of Breeds
1 Reopen DogBreeds in Xcode If you have the DogBreeds-Final project downloaded,
you might want to also open it so that you can easily refer to the final project if you are uncertain how to complete a step
2 Using File | New File from the main menus, create a new subclass of UITableViewController
(select the check boxes for a subclass of UITableViewController and create a xib file) Call it BreedsListViewController
3 Edit BreedsListViewControllerh and add a property to store which group was selected and
IBOutlets for sub-views to edit a breed and display breed details Also add properties for the fetchedResultsController and managedObjectStore like RootViewController The class will also have to implement the NSFetchedResultsControllerDelegate protocol (Listing 17-12) Listing 17-12 BreedsListViewControllerh
#import <UIKit/UIKith> @class AKCGroup; @class BreedViewController; @class BreedDetailViewController; @interface BreedsListViewController : UITableViewController <NSFetchedResultsControllerDelegate> { AKCGroup *selectedGroup; BreedViewController *breedEditorVC; BreedDetailViewController *breedDetailVC; NSFetchedResultsController *fetchedResultsController; NSManagedObjectContext *managedObjectContext; }
17:
Core Data
@property (nonatomic, retain) @property (nonatomic, retain) *breedEditorVC; @property (nonatomic, retain) *breedDetailVC; @property (nonatomic, retain) *fetchedResultsController; @property (nonatomic, retain) *managedObjectContext; @end
AKCGroup *selectedGroup; IBOutlet BreedViewController IBOutlet BreedDetailViewController NSFetchedResultsController NSManagedObjectContext
4 Open BreedsListViewControllerm and synthesize the properties you added in Step 3 and
be sure to release them in the dealloc method
5 Copy the fetchedResultsController accessor and all of the NSFetchedResultsControllerDelegate
methods from RootViewController, since we ll be fetching the Breed objects for the table in the same way as we did the AKCGroup objects in RootViewController We do need to change the fetchedResultsController so that it retrieves Breed entities and only those entities in the selected group (using a predicate):
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Breed" inManagedObjectContext:selfmanagedObjectContext]; [fetchRequest setEntity:entity]; NSPredicate *groupFilter = [NSPredicate predicateWithFormat: @"group = %@", selfselectedGroup]; [fetchRequest setPredicate:groupFilter]; 6 Change viewDidLoad to add the Edit button just like RootViewController Copy the
numberOfSectionsInTableView, numberOfRowsInSection, cellForRowAtIndexPath, and configureCell methods unchanged from RootViewController Change configureCell to only display the name Save your changes
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