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Boilerplate code for NSFetchedResultsController and UITableView
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@interface ViewController () <UITableViewDelegate, UITableViewDataSource, NSFetchedResultsControllerDelegate> | |
@property (nonatomic, weak) IBOutlet UITableView *tableView; | |
@property (nonatomic, strong) NSFetchedResultsController *fetchController; | |
@end | |
@implementation ViewController | |
- (void)viewDidLoad | |
{ | |
[super viewDidLoad]; | |
[self.tableView setDataSource:self]; | |
[self.tableView setDelegate:self]; | |
NSManagedObjectContext *context = [APPDELEGATE managedObjectContext]; | |
#warning incomplete | |
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"<#entity name#>"]; | |
#warning incomplete | |
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"<#sort key#>" ascending:YES]; | |
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil]; | |
[fetchRequest setSortDescriptors:sortDescriptors]; | |
self.fetchController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:context sectionNameKeyPath:nil cacheName:@""]; | |
[self.fetchController setDelegate:self]; | |
NSError *error; | |
if (![self.fetchController performFetch:&error]) { | |
NSLog(@"%@", error); | |
} | |
} | |
#pragma mark - UITableView / FetchController | |
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView | |
{ | |
return [[self.fetchController sections] count]; | |
} | |
- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section | |
{ | |
if ([[self.fetchController sections] count] > 0) { | |
id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchController sections] objectAtIndex:section]; | |
return [sectionInfo numberOfObjects]; | |
} else | |
return 0; | |
} | |
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath | |
{ | |
#warning incomplete | |
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"<#cell Identifier#>" forIndexPath:indexPath]; | |
[self configureCell:cell atIndexPath:indexPath]; | |
return cell; | |
} | |
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section | |
{ | |
if ([[self.fetchController sections] count] > 0) { | |
id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchController sections] objectAtIndex:section]; | |
return [sectionInfo name]; | |
} else | |
return nil; | |
} | |
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView | |
{ | |
return [self.fetchController sectionIndexTitles]; | |
} | |
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index | |
{ | |
return [self.fetchController sectionForSectionIndexTitle:title atIndex:index]; | |
} | |
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller | |
{ | |
[self.tableView beginUpdates]; | |
} | |
- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type | |
{ | |
switch(type) { | |
case NSFetchedResultsChangeInsert: | |
[self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] | |
withRowAnimation:UITableViewRowAnimationFade]; | |
break; | |
case NSFetchedResultsChangeDelete: | |
[self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] | |
withRowAnimation:UITableViewRowAnimationFade]; | |
break; | |
case NSFetchedResultsChangeMove: | |
case NSFetchedResultsChangeUpdate: | |
break; | |
} | |
} | |
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath | |
{ | |
UITableView *tableView = self.tableView; | |
switch(type) { | |
case NSFetchedResultsChangeInsert: | |
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] | |
withRowAnimation:UITableViewRowAnimationFade]; | |
break; | |
case NSFetchedResultsChangeDelete: | |
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] | |
withRowAnimation:UITableViewRowAnimationFade]; | |
break; | |
case NSFetchedResultsChangeUpdate: | |
[self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath]; | |
break; | |
case NSFetchedResultsChangeMove: | |
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] | |
withRowAnimation:UITableViewRowAnimationFade]; | |
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] | |
withRowAnimation:UITableViewRowAnimationFade]; | |
break; | |
} | |
} | |
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller | |
{ | |
[self.tableView endUpdates]; | |
} | |
#pragma mark - Private | |
- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath | |
{ | |
NSManagedObject *managedObject = [self.fetchController objectAtIndexPath:indexPath]; | |
//Configure cell | |
#warning incomplete | |
} |
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