Naturally sorting a list of titles in Cocoa

gistfile1.m

#import <Foundation/Foundation.h>

@implementation NSString (JEKNormalization)

- (NSString *)jek_normalizedString
{
    __block NSString *normalizedString = self;
    [self enumerateLinguisticTagsInRange:NSMakeRange(0, self.length) scheme:NSLinguisticTagSchemeLexicalClass options:~NSLinguisticTaggerOmitWords orthography:nil usingBlock:^(NSString *tag, NSRange tokenRange, NSRange sentenceRange, BOOL *stop) {
        if (tag == NSLinguisticTagDeterminer && tokenRange.location == 0) {
            normalizedString = [self substringFromIndex:tokenRange.length + 1];
            *stop = YES;
        }
    }];
    return normalizedString;
}

@end

@implementation NSArray (JEKNaturalSort)

- (NSArray *)jek_naturallySortedArray
{
    return [self sortedArrayUsingComparator:^(NSString *x, NSString *y) {
        return [[x jek_normalizedString] caseInsensitiveCompare:[y jek_normalizedString]];
    }];
}

@end

int main(int argc, const char *argv[])
{
    @autoreleasepool {
        NSArray *titles = @[@"A Christmas Carol",
                            @"Great Expectations",
                            @"Oliver Twist",
                            @"A Tale of Two Cities",
                            @"David Copperfield",
                            @"Hard Times",
                            @"Bleak House",
                            @"The Life and Adventures of Nicholas Nickleby",
                            @"Little Dorrit"];
        NSLog(@"%@", [titles jek_naturallySortedArray]);
        /*(
        "Bleak House",
        "A Christmas Carol",
        "David Copperfield",
        "Great Expectations",
        "Hard Times",
        "The Life and Adventures of Nicholas Nickleby",
        "Little Dorrit",
        "Oliver Twist",
        "A Tale of Two Cities"
        )*/
    }
    return 0;
}