check what is what of NSURL properties.

url_properties.m

#import <Foundation/Foundation.h>

NSDictionary *dictionaryForURL(NSURL *aURL)
{
    NSLog(@"scheme = %@ host = %@ port = %@ fragment = %@ lastPathComponent = %@ parameterString = %@ "
          @"query = %@ user = %@ password = %@ resourceSpecifier = %@",
          [aURL scheme],[aURL host],[aURL port],[aURL fragment],[aURL lastPathComponent],[aURL parameterString],
          [aURL query],[aURL user],[aURL password],[aURL resourceSpecifier]);

    NSLog(@"absoluteString = %@",[aURL absoluteString]);
    NSLog(@"relativePath = %@",[aURL relativePath]);
    NSLog(@"relativeString = %@",[aURL relativeString]);
    NSLog(@"path = %@",[aURL path]);
    NSLog(@"pathExtension = %@",[aURL pathExtension]);
    NSLog(@"baseURL = %@",[aURL baseURL]);
    NSLog(@"standardizedURL = %@",[aURL standardizedURL]);
    NSLog(@"absoluteURL = %@",[aURL absoluteURL]);

    NSMutableDictionary *aDict = [NSMutableDictionary dictionary];
    for (NSString *aString in [[aURL query] componentsSeparatedByString:@"&"]) {
        NSArray *anArray = [aString componentsSeparatedByString:@"="];
        NSString *aKey = [anArray objectAtIndex:0];
        if ( [anArray count] == 2 ) {
            NSString *aValue = [anArray objectAtIndex:1];
            [aDict setObject:aValue forKey:aKey];
        }
        else {
            [aDict setObject:[NSNull null] forKey:aKey];
        }
    }
    return aDict;
}

int main(int argc, const char * argv[])
{
    @autoreleasepool {
        NSLog(@"%@",dictionaryForURL([NSURL URLWithString:@"myscheme://myname:hogehoge@localhost:8080/cgi-bin/time.cgi;options?from=123456&to=789012&wrap=YES&novalue#something"]));
// <scheme>://<user>:<password>@<host>:<port>/<path>;<parameterString>&<query>#<fragment>
    }
    return 0;
}