NSMutableArray category for inserting objects into a sorted list

NSMutableArray+YMYSorted.m

//
//  Created by Yang Meyer on 01.08.14.
//  Licensed as CC BY 4.0 (http://creativecommons.org/licenses/by/4.0/)
//
//  NSMutableArray+YMYSorted.h
//  Gemba

#import <Foundation/Foundation.h>

@interface NSMutableArray (YMYSorted)

@property (copy) NSComparator ymy_comparator;

- (void)ymy_insertSortedObject:(id)obj;

@end

// ---------------------
//
//  NSMutableArray+YMYSorted.m
//

#import "NSMutableArray+YMYSorted.h"
#import <objc/runtime.h>

@implementation NSMutableArray (YMYSorted)

- (void)setYmy_comparator:(NSComparator)comparator
{
    objc_setAssociatedObject(self, @selector(ymy_comparator), comparator, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (NSComparator)ymy_comparator
{
    return objc_getAssociatedObject(self, @selector(ymy_comparator));
}

- (void)ymy_insertSortedObject:(id)obj
{
    NSUInteger insertionIndex = [self indexOfObject:obj
                                      inSortedRange:NSMakeRange(0, self.count)
                                            options:NSBinarySearchingInsertionIndex
                                    usingComparator:self.ymy_comparator];
    [self insertObject:obj atIndex:insertionIndex];
}

@end