title: Get values from JSON string - Objective C
body: <p>I have this JSON response string:</p>
  
  <pre><code>{"d":"{\"ID_usuario\":\"000130\",\"Nombre\":null,\"Vipxlo\":0,\"Provmun\":null,\"Descuentos\":null,\"Listaviplocal\":null}"}`
  </code></pre>
  
  <p>With this code:</p>
  
  <pre><code>- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
  {
      //Check valid signal
  
      connection = nil;
  
      NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
      //data =nil;
  
      NSArray *jsonArray = [responseString JSONValue];
  </code></pre>
  
  <p>How can I do it?</p>