title: Count of chars in NSString or NSMutableString?
body: <p>I've tried this</p>
  
  <pre><code>NSCharacterSet *myCharSet = [NSCharacterSet characterSetWithCharactersInString: myString];
  [myCharSet count];
  </code></pre>
  
  <p>But get a warning that NSCharacterSet may not respond to count.  This is for desktop apps and not iPhone, which I think the above code works with.</p>