NSMutableArray+TTAdditions.h

//
//  NSMutableArray+TTAdditions.h
//  tester
//
//  Created by Joshua Johnson on 5/1/12.
//  Copyright (c) 2012 Two Toasters, LLC. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSMutableArray (TTAdditions)

/** Sort Mutable Array using an NSComparator with a completion handler 
 * 
 * @param comparator an NSComparator block for comparing results
 * @param handler a completion handler to perform when the sort is complete
 */
- (void)tt_sortUsingComparator:(NSComparator)comparator withCompletionHandler:(void (^)(void))handler;

@end

NSMutableArray+TTAdditions.m

//
//  NSMutableArray+TTAdditions.m
//  tester
//
//  Created by Joshua Johnson on 5/1/12.
//  Copyright (c) 2012 Two Toasters, LLC. All rights reserved.
//

#import "NSMutableArray+TTAdditions.h"

static dispatch_queue_t sort_queue = NULL;

@implementation NSMutableArray (TTAdditions)

- (void)tt_sortUsingComparator:(NSComparator)comparator withCompletionHandler:(void (^)(void))handler 
{
    if (sort_queue == NULL) {
        sort_queue = dispatch_queue_create("com.twotoasters.additions.sorting", 0);
    }
    
    dispatch_async(sort_queue, ^{
        [self sortUsingComparator:comparator];    
        if (handler) {
            dispatch_async(dispatch_get_main_queue(), ^{
                handler();
            });
        }
    });
}

@end