title: What is the best practic using url string with NSString stringWithFormat
body: <p>I use <code>NSString stringWithFormat</code> method for create an URL string. But now I have problem with a "quick" editing this string.</p>
  
  <p>For example I have an script on the server that process some request with parameters.</p>
  
  <p>I have an URL string like this:</p>
  
  <pre><code>http://www.domain.com/api/?param1=%@&amp;param2=%@&amp;param3=%@&amp;param4=%@&amp;param5=%@&amp;
  </code></pre>
  
  <p>but when I have more than 5, 6 parameters it is really hard to modify this string.</p>
  
  <p>Anybody knows best method how to create URL string (I mean when we modify it).</p>