title: How to initiate WebViewController in flutter
body: <p>I was trying to declare a variable in class level as below:</p>
  <p>WebViewController _webViewController = WebViewController();</p>
  <p>sothat I can reuse that in other functions.But for nullsafety issue I tried to initialize it, but showing <strong>doesn’t have a default constructor</strong>.I tried also like,</p>
  <pre><code> WebViewController _webViewController ; (it shows to add late modifier)
  </code></pre>
  <p>or</p>
  <pre><code>WebViewController _webViewController = null; (null can not be assigned)
  </code></pre>
  <p>how should I declare ?</p>