如何调用并获取 void 函数的结果？

Question

说明：
在我的主页上，每个用户输入他们的昵称并单击按钮开始游戏。然后每个玩家必须回答多项选择，最后显示分数。

问题 当我调用“initQuestion()”时，我无法获取结果的值，并且出现一些错误，例如“此表达式的类型为 'void'，无法使用。”或“方法驱动被调用为空”

代码 我的主页调用 Game() 函数：

import 'package:flutter/material.dart';
import 'package:trivia/src/screens/questionpage.dart';

class Game extends StatelessWidget {

  final List<String> _playerNameList;
  final String gameMode; // Easy, Normal, Hard defined on HomePage
  Game(this.gameMode, this._playerNameList);


  Widget build(BuildContext context) {
    //variables
    int round = 3;
    int playerNumber = _playerNameList.length;
    Map<String, int> score; //List to store score like {'PlayerName1': '0', 'PlayerName2": '0', ...};

    //Function
    for (int i = 0; i < round; i++) { //for each round
      for (int j = 0; j < playerNumber; j++) { //for each player

        int result = initQuestion(context, gameMode, _playerNameList[j]); // Run "Question game"
        score[_playerNameList[j]] = score[_playerNameList[j]]+result; // Get result (1 if answer correct; 0 if answer invalid) and store score

      }
    }

    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Game end'),
        ),
        body: Center(
          child: Text('The winner is ...'),
        ),
      ),
    );
  }
}

initQuestion(context, gameMode, playerName) async {

    //Question
    String question = "In which continent is France located?";
    List<String> _choice = <String>["Europe","Asia","Africa"];
    String answer = "Europe";

  final result = await Navigator.push(context, MaterialPageRoute(builder: (context) => QuestionPage(playerName: playerName, answer: answer, choice: _choice, question: question)),
  );
  //Get result (0 or 1)
  return result; //--> Edited thx Selim Kundakçıoğlu

}

Answer 1

void 表示函数不返回任何内容。因此，您可以将返回类型更改为int，而不是使用void，而不是print(result);，您可以使用return result;