Future<void> ChangeProfile(BuildContext context) {
  final pro = Provider.of<Pro>(context, listen: false);
  FirebaseFirestore fireStore = FirebaseFirestore.instance;
  US(context);
  int count = 0;
  return showDialog<void>(
    context: context,
    builder: (context) {
      return StatefulBuilder(
        builder: (BuildContext context, StateSetter setState) {
          return AlertDialog(
            // RoundedRectangleBorder - Dialog 화면 모서리 둥글게 조절
            shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(10.0)),
            //Dialog Main Title
            title: Column(
              children: <Widget>[
                SizedBox(
                  width: 50.w,
                  height: 50.h,
                  child: Image.asset(
                    pro.currentProfile
                  ),
                )
              ],
            ),
            //
            content: SizedBox(
              width: 400.w,
              height: 400.h,
              child: Column(
                children: [
                  Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      
                      PrintProfile(1,"imagename");

This is my AlertDialog code I used Statefu

lBuilder to change the screen inside the AlertDialog too

class PrintProfile extends StatefulWidget {
  PrintProfile(this.num,this.text);

  final int num;
  final String text;


  @override
  State<PrintProfile> createState() => _PrintProfileState();
}
class _PrintProfileState extends State<PrintProfile> {

  @override
  Widget build(BuildContext context) {
    ParentState parent = context.findAncestorStateOfType<ParentState>();
    final int num = widget.num;
    final String text = widget.text;
    final pro = Provider.of<Pro>(context);
    final double tophe = MediaQuery.of(context).padding.top;
    US(context);
    return SizedBox(
      width: 70.w,
      height: 70.h,
      child: OutlinedButton(
        onPressed: (){
          setState(() {
            pro.currentProfile= text;
          });
        },
        child: Image.asset(text),
      ),
    );
  }
}

PrintProfile widget. When this widget is called from AlertDialog, the output part of AlertDialog, pro.currentProfile, must be changed and the parent AlertDialog setstate must be set.

ParentState parent = context.findAncestorStateOfType<ParentState>();

I found such a solution, but since the parent widget is an AlertDialog, I have to use another method. But I don't know.

Summary of Question: I want to make the setstate run in the parent AlertDialog when a button is pressed in the child widget in the AlertDialog using StatefulBuilder.

CodePudding user response：

This class will give you clear answer for use parent class setstate from current class, the same method you can do for your AlertDialog class

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'main1.dart';

void main() {
  runApp(MaterialApp(
    home: Modalbtn(),
  ));
}

class Modalbtn extends StatefulWidget {
  @override
  _ModalbtnState createState() => _ModalbtnState();
}

class _ModalbtnState extends State<Modalbtn> {
  String value = "0";
  // Pass this method to the child page.
  void _update(String newValue) {
    setState(() => value = newValue);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: Column(
          children: [
            IconButton(
              onPressed: () {
                showModalBottomSheet(
                    context: context,
                    builder: (BuildContext context) {
                      return Container(
                        height: 200,
                        child: Column(
                          children: [StatefulModalbtn(update: _update)],
                        ),
                      );
                    });
              },
              icon: Icon(Icons.add),
              iconSize: 20,
            ),
            Text(
              value,
              style: TextStyle(fontSize: 40),
            ),
          ],
        ),
      ),
    );
  }
}

import 'package:flutter/material.dart';

class StatefulModalbtn extends StatelessWidget {
  final ValueChanged<String> update;
  StatefulModalbtn({required this.update});

  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      onPressed: () => update("100"), // Passing value to the parent widget.

      child: Text('Update (in child)'),
    );
  }
}