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 .
Read moreDoes a new state object is created if the widget re build?
The State object consists of values that can change. The State object contains its associated widget’s ‘mutable state . ‘ — it stores values that can change over time. When those values have changed, more often than not, the associated StatefulWidget is re-created.
Read moreHow build method works how it rebuild itself?
There are six sets, because whenever you run the Flutter app, the setState() calls the build() method and it displays the number 0 on the screen. Next, each time you press the button, it rebuilds the descendant widget trees also. If we quit the app and restarts the app again, it starts with a fresh display of a screen.22 May 2021
Read moreWhat’s the job of the build () method?
build method Null safety Describes the part of the user interface represented by this widget . The framework calls this method when this widget is inserted into the tree in a given BuildContext and when the dependencies of this widget change (e.g., an InheritedWidget referenced by this widget changes).
Read moreWhat is the main purpose of setState () method call?
Calling setState notifies the framework that the internal state of this object has changed in a way that might impact the user interface in this subtree, which causes the framework to schedule a build for this State object.
Read more