flutter - 如何将参数传递给路由？

Question

我尝试将参数“_difficulty”从“第一页”传递到“第二页”，但我不明白该怎么做:此参数是一个字符串，表示难度模式(简单、普通、困难)

首页:当用户点击按钮时，OnPressed 被调用

onPressed: () {
   Navigator.pushNamed(context, '/gamepage', arguments: _difficulty);
},

第二页此调用接收参数以显示值

 import 'package:flutter/material.dart';

 class GamePage extends StatelessWidget {    
  final String difficultyMode;
  GamePage(this.difficultyMode);

  @override
  Widget build(BuildContext context) {

    final GamePage args = ModalRoute.of(context).settings.arguments;

    return Scaffold(
      body:  new Container(
          child: SingleChildScrollView(
              child: Text(args.difficultyMode)
          )
      ),
    );
  }
}

在 main.dart 中:我使用 onGenerateRoute: _getRoute,

Route _getRoute(RouteSettings settings) {
    switch (settings.name){
      case '/':
        return _buildRoute(settings, new Homepage());
      case '/credits':
        return _buildRoute(settings, new Credits());
      case '/gamepage':
        return _buildRoute(settings, new GamePage(diffculty));
      default:
        return null;
    }
  }

Answer 1

您可以通过 RouteSettings 获取参数。

您可以像这样访问它:

case '/gamepage':
    String difficulty = settings.arguments;
    return _buildRoute(settings, new GamePage(difficulty));

希望对您有所帮助!