Question

是否可以在Dart中显示iframe？

下面是我正在使用的代码

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final wordPair = WordPair.random();
    return MaterialApp(
      title: 'Welcome to Flutter',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Welcome to Flutter'),
        ),
        body: Center(
          child: Text(wordPair.asPascalCase),  // With this highlighted text.
        ),
      ),
    );

  }
}

我不确定如何在其中添加iframe。以下是documentation

中给出的摘录

factory IFrameElement() => JS(
    'returns:IFrameElement;creates:IFrameElement;new:true',
    '#.createElement(#)',
    document,
    "iframe");

Answer 1

我同意使用 webview_flutter 插件在 Flutter 中显示 HTML。但是，此插件目前在移动设备上受支持，但在 Web 上尚不支持。以下是您如何在移动设备上实现此功能的示例：

使用 webview_flutter 插件的示例代码：

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';
import 'dart:async';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  final Completer<WebViewController> _controller =
      Completer<WebViewController>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: WebView(
        initialUrl: 'https://flutter.dev/',
        onWebViewCreated: (WebViewController webViewController) {
          _controller.complete(webViewController);
        },
        javascriptMode: JavascriptMode.unrestricted,
      ),
    );
  }
}

实际输出：

关于您的问题如何实施 IFrameElement。实际上有 an existing blog 它提供了理解这一点的所有步骤。但如前所述，这仍处于测试阶段。

在我完成了所有必要的步骤之后，我最终得到了这个例子：

import 'package:flutter/material.dart';
import 'dart:ui' as ui;
import 'dart:html';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: IframeDemo(),
        ),
      ),
    );
  }
}

class IframeDemo extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return MyWidget();
  }
}

class MyWidget extends State<IframeDemo> {
  String _url;
  IFrameElement _iframeElement;

  @override
  initState() {
    super.initState();
    _url = 'https://flutter.dev/';
    _iframeElement = IFrameElement()
      ..src = _url
      ..id = 'iframe'
      ..style.border = 'none';
    //ignore: undefined_prefixed_name
    ui.platformViewRegistry.registerViewFactory(
      'iframeElement',
      (int viewId) => _iframeElement,
    );
  }

  @override
  Widget build(BuildContext context) {
    print('url is $_url');

    return Column(
      crossAxisAlignment: CrossAxisAlignment.center,
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Row(
          mainAxisAlignment: MainAxisAlignment.center,
        ),
        SizedBox(
          height: 600,
          width: 600,
          child: HtmlElementView(
            viewType: 'iframeElement',
          ),
        ),
      ],
    );
  }
}

样本输出：

在Dart中显示iframe

1 个答案: