createState method Null safety Creates the mutable state for this widget at a given location in the tree . Subclasses should override this method to return a newly created instance of their associated State subclass: @override State<MyWidget> createState() => _MyWidgetState();
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A stateful widget is dynamic: for example, it can change its appearance in response to events triggered by user interactions or when it receives data . Checkbox , Radio , Slider , InkWell , Form , and TextField are examples of stateful widgets.
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