title: WKWebView evaluate JavaScript return value
body: <p>I need to change a function to evaluate JavaScript from UIWebView to WKWebView. I need to return result of evaluating in this function. </p>
  
  <p>Now, I am calling:</p>
  
  <pre><code>[wkWebView evaluateJavaScript:call completionHandler:^(NSString *result, NSError *error)
  {
      NSLog(@"Error %@",error);
      NSLog(@"Result %@",result);
  }];
  </code></pre>
  
  <p>But I need get result like return value, like in <code>UIWebView</code>.
  Can you suggest a solution?</p>