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dispose method

void dispose ()

<span class="feature">override</span>

<p>Called when this object is removed from the tree permanently.</p> <p>The framework calls this method when this <a href="https:api.flutter.dev/flutter/widgets/State-class.html">State</a> object will never build again. After the framework calls <a href="../../widgets_post_widget/PostContainerState/dispose.md">dispose</a>, the <a href="https:api.flutter.dev/flutter/widgets/State-class.html">State</a> object is considered unmounted and the <a href="https:api.flutter.dev/flutter/widgets/State/mounted.html">mounted</a> property is false. It is an error to call <a href="https:api.flutter.dev/flutter/widgets/State/setState.html">setState</a> at this point. This stage of the lifecycle is terminal: there is no way to remount a <a href="https:api.flutter.dev/flutter/widgets/State-class.html">State</a> object that has been disposed.</p> <p>Subclasses should override this method to release any resources retained by this object (e.g., stop any active animations).</p> <p>If a <a href="https:api.flutter.dev/flutter/widgets/State-class.html">State</a>'s <a href="../../widgets_post_widget/PostContainerState/build.md">build</a> method depends on an object that can itself change state, for example a <a href="https:api.flutter.dev/flutter/foundation/ChangeNotifier-class.html">ChangeNotifier</a> or <a href="https:api.flutter.dev/flutter/dart-async/Stream-class.html">Stream</a>, or some other object to which one can subscribe to receive notifications, then be sure to subscribe and unsubscribe properly in <a href="../../widgets_post_widget/PostContainerState/initState.md">initState</a>, <a href="https:api.flutter.dev/flutter/widgets/State/didUpdateWidget.html">didUpdateWidget</a>, and <a href="../../widgets_post_widget/PostContainerState/dispose.md">dispose</a>:</p> <ul> <li>In <a href="../../widgets_post_widget/PostContainerState/initState.md">initState</a>, subscribe to the object.</li> <li>In <a href="https:api.flutter.dev/flutter/widgets/State/didUpdateWidget.html">didUpdateWidget</a> unsubscribe from the old object and subscribe to the new one if the updated widget configuration requires replacing the object.</li> <li>In <a href="../../widgets_post_widget/PostContainerState/dispose.md">dispose</a>, unsubscribe from the object.</li> </ul> <p>Implementations of this method should end with a call to the inherited method, as in <code>super.dispose()</code>.</p> <p>See also:</p> <ul> <li><a href="https:api.flutter.dev/flutter/widgets/State/deactivate.html">deactivate</a>, which is called prior to <a href="../../widgets_post_widget/PostContainerState/dispose.md">dispose</a>.</li> </ul>

Implementation​

@override
void dispose() \{
  controller.dispose();
  super.dispose();
\}