ction class="desc markdown">
  <p>Creates the mutable state for this widget at a given location in the tree.</p>
<p>Subclasses should override this method to return a newly created
instance of their associated <a href="https://api.flutter.dev/flutter/widgets/State-class.html">State</a> subclass:</p>
<pre class="language-dart"><code class="language-dart">@override
State&lt;SomeWidget&gt; createState() =&gt; _SomeWidgetState();
</code></pre>
<p>The framework can call this method multiple times over the lifeti