Best way to parse URL string to get values for keys?

Question

I need to parse a URL string like this one:

&ad_eurl=http://www.youtube.com/video/4bL4FI1Gz6s&hl=it_IT&iv_logging_level=3&ad_flags=0&ends         


        

Answer 1

- (NSString *)getLoginTokenFromUrl:(NSString *)urlString {
    NSURL *url = [NSURL URLWithString:urlString];
    NSArray *queryStrings = [url.query componentsSeparatedByString:@"&"];

    NSMutableDictionary *queryParams = [[NSMutableDictionary alloc] init];
    for (NSString *qs in queryStrings) {
        // Get the parameter name
        NSArray *components = [qs componentsSeparatedByString:@"="];
        NSString *key = [components objectAtIndex:0];

        // Get the parameter value
        NSString *value;
        if (components.count > 1) {
            value = [components objectAtIndex:1];
        }
        else {
            value = @"";
        }
        value = [value stringByReplacingOccurrencesOfString:@"+" withString:@" "];
        value = [value stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

        queryParams[key] = value;
    }

    return [queryParams objectForKey:@"login_token"];
}