Flutter state management

The preferred solution is to cancel the timer or stop listening to the animation in the dispose() callback . Another solution is to check the “mounted” property of this object before calling setState() to ensure the object is still in the tree.

A widget is either stateful or stateless. If a widget can change—when a user interacts with it, for example—it’s stateful. A stateless widget never changes . Icon , IconButton , and Text are examples of stateless widgets.

A peek behind the curtains. All that setState does is calling the provided callback and then the associated element gets scheduled for a new build .29 Mar 2021

setState is a way to dynamically change the UI . We call it inside the State Object class of the StatefulWidget. Calling setState marks the corresponding Widget dirty . When flutter builds the next frame (approx. every 16ms), it renders the Widget according to the latest values of the State Object.20 Haz 2021

setState method Null safety Notify the framework that the internal state of this object has changed. Whenever you change the internal state of a State object, make the change in a function that you pass to setState: setState(() { _myState = newValue; }); The provided callback is immediately called synchronously.