UITableView animation

gistfile1.m

- (void)animateTableViewUpdate:(UITableView *)inTableView FromOldList:(NSArray *)oldList newList:(NSArray *)newList comparisionKey:(NSString *)inKey {
    NSMutableDictionary *oldMap = [NSMutableDictionary dictionary];
    NSMutableDictionary *newMap = [NSMutableDictionary dictionary];
    NSMutableSet *oldSet = [NSMutableSet set];
    NSMutableSet *newSet = [NSMutableSet set];
    NSMutableSet *deleteSet = nil;
    NSMutableSet *insertSet = nil;
    static NSInteger offset = 0;

    [oldList enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop){
        [oldMap setObject:obj forKey:[obj valueForKey:inKey]];
    }];

    [newList enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop){
        [newMap setObject:obj forKey:[obj valueForKey:inKey]];
    }];

    [oldSet addObjectsFromArray:[oldMap allKeys]];
    [newSet addObjectsFromArray:[newMap allKeys]];
    
    deleteSet = [oldSet mutableCopy];
    [deleteSet minusSet:newSet];
    
    insertSet = [newSet mutableCopy];
    [insertSet minusSet:oldSet];

    [inTableView beginUpdates];

    // Process moves
    for (NSUInteger i = 0; i < [newList count]; i++) {
        NSString *candidateObject = newList[i];
        NSString *candidateKey = [candidateObject valueForKey:inKey];
        
        if ([deleteSet containsObject:candidateKey] == NO &&
            [insertSet containsObject:candidateKey] == NO) {
            NSUInteger oldIndex = [oldList indexOfObject:[oldMap objectForKey:candidateKey]];
            NSUInteger newIndex = [newList indexOfObject:[newMap objectForKey:candidateKey]];

            
            NSIndexPath *oldIndexPath = [NSIndexPath indexPathForRow:(NSInteger)oldIndex + offset inSection:0];
            NSIndexPath *newIndexPath = [NSIndexPath indexPathForRow:(NSInteger)newIndex + offset inSection:0];
            
            if (oldIndex != newIndex) {
//                NSLog(@"MOVE row at %@ to %@", oldIndexPath, newIndexPath);
                [inTableView moveRowAtIndexPath:oldIndexPath toIndexPath:newIndexPath];
            }
        }
    }

    // Process deletes
    for (NSString *deleteKey in deleteSet) {
        NSUInteger index = [oldList indexOfObject:[oldMap objectForKey:deleteKey]];
        NSIndexPath *indexPath = [NSIndexPath indexPathForRow:(NSInteger)index + offset inSection:0];
        NSParameterAssert(index != NSNotFound);

//        NSLog(@"DELETE row at %@", [NSArray arrayWithObject:indexPath]);
        [inTableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
    }
    
    // Process inserts
    for (NSString *insertKey in insertSet) {
        NSUInteger index = [newList indexOfObject:[newMap objectForKey:insertKey]];
        NSIndexPath *indexPath = [NSIndexPath indexPathForRow:(NSInteger)index + offset inSection:0];
        NSParameterAssert(index != NSNotFound);

//        NSLog(@"INSERT row at %@", [NSArray arrayWithObject:indexPath]);
        [inTableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
    }
    
    [inTableView endUpdates];
}