title: Swift stringByEvaluatingJavaScriptFromString
body: <p>I try to use some javascript on my WebView with the new </p>
  
  <p><code>stringByEvaluatingJavaScriptFromString</code> function </p>
  
  <p>I m not quiet familiar with the syntax so i tried</p>
  
  <pre><code> func stringByEvaluatingJavaScriptFromString( "document.documentElement.style.webkitUserSelect='none'": String) -&gt; String? 
  </code></pre>
  
  <p>as shown here <a href="https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIWebView_Class/index.html#//apple_ref/occ/instm/UIWebView/stringByEvaluatingJavaScriptFromString" rel="noreferrer">https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIWebView_Class/index.html#//apple_ref/occ/instm/UIWebView/stringByEvaluatingJavaScriptFromString</a>: but i get a error that "Expected '.' separator"</p>