title: Convert NSString to UTF8String?
body: <p>Currently I am download data from a server and I have this line to get that NSData into a NSString.</p>
  
  <pre><code>NSString *txt = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
  </code></pre>
  
  <p>How would I go from here to convert that NSString into a UTF8 string?</p>
  
  <p>Thanks!</p>