Utility category for deleting all cookies from a given domain.

NSHTTPCookieStorage+Util.h

//
// Created by Alex Manarpies on 25/02/14.
//

@interface NSHTTPCookieStorage (Util)

/**
* Iterates over all cookies for a given a domain and deletes them from the cookie store.
*/
- (void)util_deleteCookiesForURL:(NSURL*)url;

@end

NSHTTPCookieStorage+Util.m

//
// Created by Alex Manarpies on 25/02/14.
//

#import "NSHTTPCookieStorage+Util.h"

@implementation NSHTTPCookieStorage (Util)

- (void)util_deleteCookiesForURL:(NSURL *)url
{
    NSArray *cookies = [self cookiesForURL:url];
    for (NSHTTPCookie *cookie in cookies) {
        [self deleteCookie:cookie];
    }
}

@end

Usage example:

[[NSHTTPCookieStorage sharedHTTPCookieStorage] util_deleteCookiesForURL:self.baseURL];