title: About AttributeString - making multiple occurrences bold
body: <p>I am trying to make multiple occurrences in a attributed string bold using something like the following</p>
  
  <pre><code>[attrStr setFont:[UIFont ...] range:[attrStr.string rangeOfString:@"hello world"]];
  </code></pre>
  
  <p>As you know, 'rangeOfString' always return the FIRST occurrence of the match... I am still quite new to iOS, just wondering what's the best way to set all occurrences to bold... Is there any function provided in NSString or something? </p>
  
  <p>Thanks in advance!</p>