How do I URL encode a string

Question

I have a URL string (NSString) with spaces and & characters. How do I url encode the entire string (including the & ampersand

Answer 1

-(NSString *)encodeUrlString:(NSString *)string {
  return CFBridgingRelease(
                    CFURLCreateStringByAddingPercentEscapes(
                        kCFAllocatorDefault,
                        (__bridge CFStringRef)string,
                        NULL,
                        CFSTR("!*'();:@&=+$,/?%#[]"),
                        kCFStringEncodingUTF8)
                    );
}

according to the following blog