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UICollectionView + NSfetchedResultsControllerDelegate
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/* | |
The MIT License (MIT) | |
Copyright (c) 2013 Lucien Constantino | |
Permission is hereby granted, free of charge, to any person obtaining a copy | |
of this software and associated documentation files (the "Software"), to deal | |
in the Software without restriction, including without limitation the rights | |
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
copies of the Software, and to permit persons to whom the Software is | |
furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in all | |
copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
SOFTWARE. | |
*/ | |
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath | |
{ | |
NSMutableDictionary *change = [NSMutableDictionary new]; | |
switch(type) | |
{ | |
case NSFetchedResultsChangeInsert: | |
change[@(type)] = newIndexPath; | |
break; | |
case NSFetchedResultsChangeDelete: | |
change[@(type)] = indexPath; | |
break; | |
case NSFetchedResultsChangeUpdate: | |
change[@(type)] = indexPath; | |
break; | |
case NSFetchedResultsChangeMove: | |
change[@(type)] = @[indexPath, newIndexPath]; | |
break; | |
} | |
[_objectChanges addObject:change]; | |
} | |
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller | |
{ | |
NSLog(@"section changes: %i", [_sectionChanges count]); | |
NSLog(@"obj changes: %i", [_objectChanges count]); | |
if ([_sectionChanges count] > 0) | |
{ | |
[_collectionView performBatchUpdates:^{ | |
for (NSDictionary *change in _sectionChanges) | |
{ | |
[change enumerateKeysAndObjectsUsingBlock:^(NSNumber *key, id obj, BOOL *stop) { | |
NSFetchedResultsChangeType type = [key unsignedIntegerValue]; | |
switch (type) | |
{ | |
case NSFetchedResultsChangeInsert: | |
[self.collectionView insertSections:[NSIndexSet indexSetWithIndex:[obj unsignedIntegerValue]]]; | |
break; | |
case NSFetchedResultsChangeDelete: | |
[self.collectionView deleteSections:[NSIndexSet indexSetWithIndex:[obj unsignedIntegerValue]]]; | |
break; | |
case NSFetchedResultsChangeUpdate: | |
[self.collectionView reloadSections:[NSIndexSet indexSetWithIndex:[obj unsignedIntegerValue]]]; | |
break; | |
} | |
}]; | |
} | |
} completion:nil]; | |
} | |
if ([_objectChanges count] > 0 && [_sectionChanges count] == 0) | |
{ | |
[self.collectionView performBatchUpdates:^{ | |
for (NSDictionary *change in _objectChanges) | |
{ | |
[change enumerateKeysAndObjectsUsingBlock:^(NSNumber *key, id obj, BOOL *stop) { | |
NSFetchedResultsChangeType type = [key unsignedIntegerValue]; | |
switch (type) | |
{ | |
case NSFetchedResultsChangeInsert: | |
[self.collectionView insertItemsAtIndexPaths:@[obj]]; | |
break; | |
case NSFetchedResultsChangeDelete: | |
[self.collectionView deleteItemsAtIndexPaths:@[obj]]; | |
break; | |
case NSFetchedResultsChangeUpdate: | |
[self.collectionView reloadItemsAtIndexPaths:@[obj]]; | |
break; | |
case NSFetchedResultsChangeMove: | |
[self.collectionView moveItemAtIndexPath:obj[0] toIndexPath:obj[1]]; | |
break; | |
} | |
}]; | |
} | |
} completion:^(BOOL finished) { | |
}]; | |
} | |
[_sectionChanges removeAllObjects]; | |
[_objectChanges removeAllObjects]; | |
} |
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Just implemented this pod: https://github.com/k06a/ABCollectionViewFRC