To get all ranges of the string in NSString

NSString+Ranges.m

//
//  NSString+Ranges.h
//  Modeling
//
//  Created by Heechul Ryu on 12/11/15.
//  Copyright © 2015 Heechul Ryu. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSString (Ranges)
- (nonnull NSArray <NSValue *> *)rangesOfString:(nonnull NSString *)string;
@end

//
//  NSString+Ranges.m
//  Modeling
//
//  Created by Heechul Ryu on 12/11/15.
//  Copyright © 2015 Heechul Ryu. All rights reserved.
//

#import "NSString+Ranges.h"

@implementation NSString (Ranges)

- (NSArray <NSValue *> *)rangesOfString:(NSString *)string
{
    NSMutableArray *ranges = [NSMutableArray new];

    NSString *searchedString = @"";
    NSString *toBeSearchedString = self;

    while (toBeSearchedString.length) {
        NSRange range = [toBeSearchedString rangeOfString:string];

        if (range.location == NSNotFound) {
            break;
        }

        NSRange rangeInTotal = NSMakeRange(range.location + searchedString.length, range.length);

        NSString *justSearchedString = [toBeSearchedString substringToIndex:range.location + range.length];
        toBeSearchedString = [toBeSearchedString substringFromIndex:justSearchedString.length];
        searchedString = [NSString stringWithFormat:@"%@%@", searchedString, justSearchedString];

        [ranges addObject:[NSValue valueWithRange:rangeInTotal]];
    }
    
    return ranges;
}

@end