我有一个测验屏幕，其中我使用API和FutureBuilder。每次刷新build方法时，获取新问题。底部有一个提交按钮，用于保存响应和重置屏幕。我想做的是disable提交按钮，直到按下提交按钮后获取新问题，并在重建新问题时启用。我不能用bool变量调用setstate使其为null，因为新问题会因此而加载。下面是我的代码来重现这个问题：

import 'package:flutter/material.dart';

class QuizForm extends StatefulWidget {
  const QuizForm({Key? key}) : super(key: key);

  @override
  State<QuizForm> createState() => _QuizFormState();
}

class _QuizFormState extends State<QuizForm> {

  int buildCount = 0 ;

  getQuestion () {}

  @override
  Widget build(BuildContext context) {
    print(buildCount);
    print('Question Fetched and UI is building');
    return SafeArea(child: Scaffold(
      body: FutureBuilder(
        future: getQuestion(),
        builder: (context, snapshot){
          return ListView(
            children: [
              ListTile(title: Text('Quiz Title'),),
              ListTile(title: Text('1'),),
              ListTile(title: Text('2'),),
              ListTile(title: Text('3'),),
              ListTile(title: Text('4'),),
              SizedBox(height: 20,),

              ElevatedButton(
                  onPressed: () async {
                    print('Please Wait, Answer is getting Saved');
                    // Button Should be shown disabled for 3 seconds
                    await Future.delayed(const Duration(seconds: 3));
                    buildCount++;

                    setState(() {
                  // this setState rebuilds the screen and new question is loaded
                  // because of future builder
                });
              }, child: Text('Submit Quiz'))
            ],
          );
        },
      ),
    ));
  }
}