Because we can’t call setState() directly in the initState method , we can’t call it from a function called by initState either. Unless this function is asynchronous and the setState call is made after the first await.
Read moreHow many times is initState called Flutter?
3. initState() This is the first method called when the widget is created (after the class constructor, of course.) initState is called once and only once .
Read moreWhat is didUpdateWidget flutter?
didUpdateWidget() This method is helpful to unsubscribe the old object and subscribe to new one if it is required for the object to be replaced with updated widget configuration. Overriding this method responds when the widget changes (example, to begin implicit animations).
Read moreWhat is createState () in flutter?
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();
Read moreWhat is a stateful widget?
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.
Read moreWhat is key flutter?
Flutter commonly uses keys when it needs to uniquely identify specific widgets within a collection . Using keys also helps Flutter preserve the state of StatefulWidget s while they’re being replaced with other widgets or just moved in the widget tree.
Read moreWhat is Flutter build context?
A handle to the location of a widget in the widget tree . This class presents a set of methods that can be used from StatelessWidget. build methods and from methods on State objects. BuildContext objects are passed to WidgetBuilder functions (such as StatelessWidget. build), and are available from the State.
Read more