NSURL category to get and set Finder tags.

NSURL+Tags.h

//
//  NSURL+Tags.h
//
//  Created by Bryan Luby on 10/23/13.
//  Copyright (c) 2013 Bryan Luby. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSURL (Tags)

- (NSArray *)bjl_tags;
- (void)bjl_setTags:(NSArray *)newTags;

@end

NSURL+Tags.m

//
//  NSURL+Tags.m
//
//  Created by Bryan Luby on 10/23/13.
//  Copyright (c) 2013 Bryan Luby. All rights reserved.
//

#import "NSURL+Tags.h"

@implementation NSURL (Tags)

- (void)bjl_setTags:(NSArray *)newTags
{
    NSError *setTagError = nil;
    BOOL success = [self setResourceValue:newTags
                                   forKey:NSURLTagNamesKey
                                    error:&setTagError];
    
    if (!success) {
        NSLog(@"Error: %@", [setTagError localizedDescription]);
    }
}

- (NSArray *)bjl_tags
{
    NSArray *currentTags = nil;
    NSError *getTagError = nil;
    
    BOOL success = [self getResourceValue:&currentTags
                                   forKey:NSURLTagNamesKey
                                    error:&getTagError];
    
    if (success) {
        return currentTags;
    } else {
        NSLog(@"Error: %@", [getTagError localizedDescription]);
        return nil;
    }
}

@end