title: Convert any data type to NSString
body: <pre><code>cell.textField.text = [contact valueForKey:formCell.variableName];
  </code></pre>
  
  <p>The valueForKey which i get is of unknown type, it can be NSNumber, int, float, NSString..</p>
  
  <p>I want to convert the value to NSString.</p>
  
  <p>using NSString stringWithFormat, should specify format specifier, the type of object is known at run time </p>