Widget rebuild after TextField selection Flutter

You haven't given us the entire code for this, so I don't know what the context is.

One pitfall I myself have fallen into (and might be affecting you, as I gather from your description) is having a stateful widget nested inside another stateful widget.

For instance,

class Parent extends StatefulWidget {
  @override
  ParentState createState() => ParentState();
 
  (...)
}

class ParentState extends State<Parent> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Child(),
    );
  }

  (...)
}

class Child extends StatefulWidget {
  @override
  ChildState createState() => ChildState();
 
  (...)
}

class ChildState extends State<Child> {
  @override
  Widget build(BuildContext context) {
    return TextField(...);
  }

  (...)
}

The problem here is that a rebuild of Parent means that ParentState().build() is run, and a new Child instance is created, with a new ChildState object. Which resets everything.

Try not recreating ChildWidget, but instead saving it on ParentState, like so:

class Parent extends StatefulWidget {
  @override
  ParentState createState() => ParentState();
 
  (...)
}

class ParentState extends State<Parent> {
  Child _child;

  @override
  void initState() {
    _child = Child();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: _child,
    );
  }

  (...)
}
// The rest remains the same

Edit: You just need to remember that, if your widget tree is a bit more complex, you may need to 1) pass a callback from the Parent to notify of state changes, and 2) not forget to also call setState() on the Child.

hi dont use Scaffold key i.e

    Scaffold (
    ...
    key: _scaffoldKey, //remove this
    ...
    )

on the page and do a complete page rebuild (not hot reload), and you should be fine worked for me tho!

you just need make a new class and import that on your target class that seen problem. for example :

I usually create a class like this :

class MiddleWare
{
  static MiddleWare shared = MiddleWare();
  _MiddleWare(){}
  String myText = "my Text";
  // every variables should be here...
}

and

import "MiddleWare.dart";

class myclass extends StatefulWidget {
  @override
  _myclassState createState() => _myclassState();
}

class _myclassState extends State<myclass> {
  @override
  Widget build(BuildContext context) {
    return Container(child: Text(MiddleWare.shared.myText));
  }
}

that's it.