There are multiple reasons : Widgets are immutable . Since StatefulWidget extends Widget it therefore must be immutable too. Splitting the declaration into two classes allows both StatefulWidget to be immutable and State to be mutable.
Read moreHow do you call a build method in Flutter?
Calling the setState() method in a stateful widget in Flutter calls the build() method first. Not only that, the build() method rebuilds all the descendant widgets. To enhance your fluttering performance, you need to understand the inner mechanism of Flutter.22 May 2021
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 moreWhat is the use of build in Flutter?
Flutter widgets are built using a modern framework that takes inspiration from React . The central idea is that you build your UI out of widgets. Widgets describe what their view should look like given their current configuration and state.
Read moreWhy is the build method on state and not StatefulWidget?
1 Answer. The reason why StatefulWidget uses a separate State class and not having build method inside its body is because all fields inside a Widget are immutable , and this includes all its sub-classes.
Read moreWhy We Use build in Flutter?
Flutter is an open-source software development kit which enables smooth and easy cross-platform mobile app development . You can build high quality natively compiled apps for iOS and Android quickly, without having to write the code for the two apps separately. All you need is one codebase for both platforms.
Read moreWhat is flutter build method?
The flutter build method in flutter describes the user interface represented by this widget when it is inserted in the build context provided in the widget tree and the dependency of the widget is changed .
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