flutter - 如何在 flutter 的命名路由中传递多个参数

Question

我正在尝试将多个参数传递给命名路由。我尝试了多种方法，但到目前为止还没有成功。谁能告诉我如何实现这一目标？
路线.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:brandcare/views/pdf_view.dart';
import 'package:brandcare/views/reports_view.dart';

class RouteGenerator {
  static Route<dynamic> generateRoute(RouteSettings settings) {
    final args = settings.arguments;
    switch (settings.name) {
      case 'reports':
        return CupertinoPageRoute(builder: (BuildContext context) => ReportsView());
      case 'pdf':
        return CupertinoPageRoute(builder: (BuildContext context) => PDFView());
      default:
        return CupertinoPageRoute(builder: (BuildContext context) => DashboardView());
    }
  }
}

reports_view.dart 中列表项上的 Ontap 事件

onTap: () {
  Navigator.pushNamed(
    context, 'pdf',
    arguments: PDFView(
      reportTitle: 'January Report',
      reportFullPath: 'https://static.example.com/reports/123456.pdf'
    )
  );
},

我想访问多个参数的页面
pdf_view.dart

class PDFView extends StatefulWidget {
  final String reportTitle;
  final String reportFullPath;

  PDFView({
    Key key,
    this.reportTitle,
    this.reportFullPath,
  }) : super(key: key);

  @override
  _PDFViewState createState() => _PDFViewState();
}

class _PDFViewState extends State<PDFView> {
  String title = this.widget.reporTitle;
  String url = this.widget.reportFullPath;
}

Answer 1

你传递了错误的论点。您需要传递您想要的特定参数对象。对于您的情况，您需要创建一个这样的:

class ScreenArguments {
  final String reportTitle;
  final String reportFullPath;

  ScreenArguments(this.reportTitle, this.reportFullPath);
}

现在在推送这样的路由时将此对象作为参数传递:

Navigator.pushNamed(
      context,
      'pdf',
      arguments: ScreenArguments(
        'January Report',
         'https://static.example.com/reports/123456.pdf',
      ),
    );

现在您需要访问传递给路由生成器中的路由的参数。像这样:

class RouteGenerator {
  static Route<dynamic> generateRoute(RouteSettings settings) {
    final args = settings.arguments;
    switch (settings.name) {
      case 'reports':
        return CupertinoPageRoute(builder: (BuildContext context) => ReportsView());
      case 'pdf':
        return CupertinoPageRoute(builder: (BuildContext context) {
          ScreenArguments argument = args;
          return PDFView(
            reportTitle: argument.reportTitle,
            reportFullPath: argument.reportFullPath,
          );
        });
      default:
        return CupertinoPageRoute(builder: (BuildContext context) => DashboardView());
    }
  }
}

这将解决您的问题