关闭 WebviewScaffold 或调整 flutterWebviewPlugin 的大小以适合父小部件

Posted 2023-02-23

【中文标题】关闭 WebviewScaffold 或调整 flutterWebviewPlugin 的大小以适合父小部件

【英文标题】：Close out of WebviewScaffold or size flutterWebviewPlugin to fit parent widget

【发布时间】：2020-03-16 19:51:14

【问题描述】：

我正在使用flutter_webview_plugin: ^0.3.8 在我的flutter 应用程序中打开一个webview。 当我单击一个按钮时，会打开一个 web 视图。 我可以通过两种方式做到这一点。 FlutterWebviewPlugin flutterWebviewPlugin = FlutterWebviewPlugin();

1) flutterWebviewPlugin.launch('https://google.com',withjavascript: true); 问题是它在网络视图中打开谷歌，但它占据了整个可用屏幕。它不尊重父小部件中定义的安全区域或其他任何内容，并且不确定如何在应用栏中添加后退按钮。 我可以用 flutterWebviewPlugin.close() 关闭它

2)Navigator.push<dynamic>( context, MaterialPageRoute<dynamic>( builder: (BuildContext context) => WebviewScaffold( url: 'https://google.com', withJavascript: true, appBar: AppBar( title: Text("Widget webview"), ),),),);

这尊重安全区域，我也可以有一个带有后退按钮的应用栏，但我无法关闭它。 flutterWebviewPlugin.close() 似乎不起作用。

我还有一个 dispose 方法：

flutterWebviewPlugin.dispose();
super.dispose();

我需要一种方法来关闭 WebviewScaffold 或根据父小部件调整 flutterWebviewPlugin 的大小。我该怎么做？

【参考方案1】：

使用flutter解决webview中的状态栏重叠

 @override
  Widget build(BuildContext context) 
    return new MaterialApp(
      debugShowCheckedModeBanner: false,
        home: Container(
          margin: const EdgeInsets.only(top: 0.0),
          child: SafeArea(
          top: true,
          child: new WebviewScaffold(
            url: gisUrl,
            withZoom: true,
            withLocalStorage: true,
            hidden: true,
            initialChild: Container(
              color: Colors.white,
              child: const Center(
              child: Text('Loading.....'),
            ),
        ),
      ),
    ),
  ),
);

【参考方案2】：

您可以使用包https://pub.dev/packages/flutter_inappbrowser（编辑：它已重命名为flutter_inappwebview） 允许您添加内联 webview

demo 显示带有默认项目的内联 webview

完整示例代码

import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';

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

class MyApp extends StatelessWidget 
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) 
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  


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

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

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


class _MyHomePageState extends State<MyHomePage> 
  int _counter = 0;

  void _incrementCounter() 
    setState(() 
      Navigator.push(context, MaterialPageRoute(builder: (BuildContext context) => MyInAppWebView(webUrl: "https://flutter.dev/",webRect: Rect.fromLTWH(0, 0, 300, 300))));
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    );
  

  @override
  Widget build(BuildContext context) 
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Expanded( child: MyInAppWebView(webUrl: "https://flutter.dev/", webRect: Rect.fromLTWH(0, 0, 300, 300),)),
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  



class MyInAppWebView extends StatelessWidget 
  String webUrl;
  final Rect webRect;
  InAppWebViewController webView;
  MyInAppWebView(Key key, this.webUrl, this.webRect) : super(key: key);
  @override
  Widget build(BuildContext context) 
    InAppWebView webWidget = new InAppWebView(
        initialUrl: webUrl,
        initialHeaders: ,
        initialOptions: InAppWebViewWidgetOptions(),
        onWebViewCreated: (InAppWebViewController controller) 
          webView = controller;
        ,
        onLoadStart: (InAppWebViewController controller, String url) 
          print("InAppWebView.onLoadStart: $url");
          this.webUrl = url;
        ,
        onProgressChanged: (InAppWebViewController controller, int progress) 
          double prog = progress / 100;
          print('InAppWebView.onProgressChanged: $prog');
        );
    return Container(
      width: webRect.width,
      height: webRect.height,
      child: webWidget,
    );