What is the class in Flutter?

Widget class Null safety Widgets are the central class hierarchy in the Flutter framework . A widget is an immutable description of part of a user interface. Widgets can be inflated into elements, which manage the underlying render tree. Widgets themselves have no mutable state (all their fields must be final).

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Is setState good in Flutter?

When we want to change the UI of the screen . We don’t need to call setState every time we change a variable. We call setState only when we want the change in a variable to reflect on the UI of the screen. For instance, say you have a form containing a text field and a button to submit it.

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