title: Difference between class func vs only func
body: <p>Whats the difference between these 2?</p>
  
  <pre><code>extension UIFont {
      class func PrintFontFamily(font: FontName) {
          let arr = UIFont.fontNamesForFamilyName(font.rawValue)
          for name in arr {
              println(name)
          }
      }
  }
  
  extension UIFont {
      func PrintFontFamily(font: FontName) {
          let arr = UIFont.fontNamesForFamilyName(font.rawValue)
          for name in arr {
              println(name)
          }
      }
  }
  </code></pre>