NSURL+Dictionaries — Returns properties query and fragment of NSURL as NSDictionary

NSURL+Dictionaries.h

@interface NSURL (Dictionaries)

@property (nonatomic, readonly) NSDictionary *queryDictionary;
@property (nonatomic, readonly) NSDictionary *fragmentDictionary;

- (NSURL *)URLByAppendingQueryParameters:(NSDictionary *)parameters;

@end

NSURL+Dictionaries.m

#import "NSURL+Dictionaries.h"

@implementation NSURL (Dictionaries)

- (NSDictionary *)parseParametersString:(NSString *)parametersString {
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    NSArray *parameters = [parametersString componentsSeparatedByString:@"&"];
    for (NSString *parameter in parameters) {
        NSArray *parts = [parameter componentsSeparatedByString:@"="];
        NSString *key = [[parts objectAtIndex:0] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
        if ([parts count] > 1)
        {
            id value = [[parts objectAtIndex:1] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
            [dict setObject:value forKey:key];
        }
        
    }
    return [NSDictionary dictionaryWithDictionary:dict];
}

- (NSDictionary *)queryDictionary {
    return [self parseParametersString:self.query];
}

- (NSDictionary *)fragmentDictionary {
    return [self parseParametersString:self.fragment];
}

- (NSURL *)URLByAppendingQueryParameters:(NSDictionary *)parameters {
    if (!parameters || parameters.count == 0) {
        return [self copy];
    }

    NSMutableString *queryString = [NSMutableString stringWithString:@""];
    for (NSString *key in parameters) {
        [queryString appendString:[NSString stringWithFormat:@"%@%@=%@",
                        ([queryString isEmpty] ? @"" : @"&"), key, parameters[key]]];
    }

    NSString *URLString = [[NSString alloc] initWithFormat:@"%@%@%@", [self absoluteString],
                                                           [self query] ? @"&" : @"?", queryString];
    return [NSURL URLWithString:URLString];
}

@end