title: Change webview URL in React native
body: <p>I have an app that has a WebView and a bottom navigation bar.</p>
  <p>Back, forward and reload buttons work ok since there are goForward(), goBack() and reload() method.</p>
  <p>But I also have a home button that should load the starting url.
  I tried setting the new url with <code>this.setState</code> but it doesn't work.</p>
  <pre><code>this.setState({
    ...this.state,
    url: DEFAULT_URL,
  })
  </code></pre>
  <p>Actually it works the first time. For example if I change the URL in the source and hot reload then it works. But if I click on any link home doesn't work anymore.</p>
  <p>Is it possible to do this and if so what am I doing wrong?</p>