flutter开发实战-webview插件flutter_inappwebview使用-Toy模板网

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flutter开发实战-webview插件flutter_inappwebview使用

在开发过程中，经常遇到需要使用WebView，Webview需要调用原生的插件来实现。常见的flutter的webview插件是webview_flutter，flutter_inappwebview。之前整理了一下webview_flutter，查看https://blog.csdn.net/gloryFlow/article/details/131683122

这里我们使用flutter_inappwebview来加载网页。

inappwebview,移动开发,flutter开发实战,flutter,flutter,inappwebview,HTML5,webview

一、引入flutter_inappwebview

使用flutter_inappwebview，需要在pubspec.yaml引入插件。

  # 浏览器
  flutter_inappwebview: 5.4.3+7

二、使用flutter_inappwebview

使用flutter_inappwebview插件前，我们先看下flutter_inappwebview提供的webview的属性

WebView(
      {this.windowId,
      this.onWebViewCreated,
      this.onLoadStart,
      this.onLoadStop,
      this.onLoadError,
      this.onLoadHttpError,
      this.onProgressChanged,
      this.onConsoleMessage,
      this.shouldOverrideUrlLoading,
      this.onLoadResource,
      this.onScrollChanged,
      @Deprecated('Use `onDownloadStartRequest` instead')
          this.onDownloadStart,
      this.onDownloadStartRequest,
      this.onLoadResourceCustomScheme,
      this.onCreateWindow,
      this.onCloseWindow,
      this.onJsAlert,
      this.onJsConfirm,
      this.onJsPrompt,
      this.onReceivedHttpAuthRequest,
      this.onReceivedServerTrustAuthRequest,
      this.onReceivedClientCertRequest,
      this.onFindResultReceived,
      this.shouldInterceptAjaxRequest,
      this.onAjaxReadyStateChange,
      this.onAjaxProgress,
      this.shouldInterceptFetchRequest,
      this.onUpdateVisitedHistory,
      this.onPrint,
      this.onLongPressHitTestResult,
      this.onEnterFullscreen,
      this.onExitFullscreen,
      this.onPageCommitVisible,
      this.onTitleChanged,
      this.onWindowFocus,
      this.onWindowBlur,
      this.onOverScrolled,
      this.onZoomScaleChanged,
      this.androidOnSafeBrowsingHit,
      this.androidOnPermissionRequest,
      this.androidOnGeolocationPermissionsShowPrompt,
      this.androidOnGeolocationPermissionsHidePrompt,
      this.androidShouldInterceptRequest,
      this.androidOnRenderProcessGone,
      this.androidOnRenderProcessResponsive,
      this.androidOnRenderProcessUnresponsive,
      this.androidOnFormResubmission,
      @Deprecated('Use `onZoomScaleChanged` instead')
          this.androidOnScaleChanged,
      this.androidOnReceivedIcon,
      this.androidOnReceivedTouchIconUrl,
      this.androidOnJsBeforeUnload,
      this.androidOnReceivedLoginRequest,
      this.iosOnWebContentProcessDidTerminate,
      this.iosOnDidReceiveServerRedirectForProvisionalNavigation,
      this.iosOnNavigationResponse,
      this.iosShouldAllowDeprecatedTLS,
      this.initialUrlRequest,
      this.initialFile,
      this.initialData,
      this.initialOptions,
      this.contextMenu,
      this.initialUserScripts,
      this.pullToRefreshController,
      this.implementation = WebViewImplementation.NATIVE});
}

列一下常用的几个

initialUrlRequest：加载url的请求
initialUserScripts：初始化设置的script
initialOptions：初始化设置的配置
onWebViewCreated：webview创建后的callback回调
onTitleChanged：网页title变换的监听回调
onLoadStart：网页开始加载
shouldOverrideUrlLoading：确定路由是否可以替换，比如可以控制某些连接不允许跳转。
onLoadStop：网页加载结束
onProgressChanged：页面加载进度progress
onLoadError：页面加载失败
onUpdateVisitedHistory；更新访问的历史页面回调
onConsoleMessage：控制台消息，用于输出console.log信息

使用WebView加载网页

class WebViewInAppScreen extends StatefulWidget {
  const WebViewInAppScreen({
    Key? key,
    required this.url,
    this.onWebProgress,
    this.onWebResourceError,
    required this.onLoadFinished,
    required this.onWebTitleLoaded,
    this.onWebViewCreated,
  }) : super(key: key);

  final String url;
  final Function(int progress)? onWebProgress;
  final Function(String? errorMessage)? onWebResourceError;
  final Function(String? url) onLoadFinished;
  final Function(String? webTitle)? onWebTitleLoaded;
  final Function(InAppWebViewController controller)? onWebViewCreated;

  @override
  State<WebViewInAppScreen> createState() => _WebViewInAppScreenState();
}

class _WebViewInAppScreenState extends State<WebViewInAppScreen> {
  final GlobalKey webViewKey = GlobalKey();

  InAppWebViewController? webViewController;
  InAppWebViewOptions viewOptions = InAppWebViewOptions(
    useShouldOverrideUrlLoading: true,
    mediaPlaybackRequiresUserGesture: true,
    applicationNameForUserAgent: "dface-yjxdh-webview",
  );

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
  }

  @override
  void dispose() {
    // TODO: implement dispose
    webViewController?.clearCache();
    super.dispose();
  }

  // 设置页面标题
  void setWebPageTitle(data) {
    if (widget.onWebTitleLoaded != null) {
      widget.onWebTitleLoaded!(data);
    }
  }

  // flutter调用H5方法
  void callJSMethod() {
    
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        Expanded(
          child: InAppWebView(
            key: webViewKey,
            initialUrlRequest: URLRequest(url: Uri.parse(widget.url)),
            initialUserScripts: UnmodifiableListView<UserScript>([
              UserScript(
                  source:
                      "document.cookie='token=${ApiAuth().token};domain='.laileshuo.cb';path=/'",
                  injectionTime: UserScriptInjectionTime.AT_DOCUMENT_START),
            ]),
            initialOptions: InAppWebViewGroupOptions(
              crossPlatform: viewOptions,
            ),
            onWebViewCreated: (controller) {
              webViewController = controller;

              if (widget.onWebViewCreated != null) {
                widget.onWebViewCreated!(controller);
              }
            },
            onTitleChanged: (controller, title) {
              if (widget.onWebTitleLoaded != null) {
                widget.onWebTitleLoaded!(title);
              }
            },
            onLoadStart: (controller, url) {},
            shouldOverrideUrlLoading: (controller, navigationAction) async {
              // 允许路由替换
              return NavigationActionPolicy.ALLOW;
            },
            onLoadStop: (controller, url) async {

              // 加载完成
              widget.onLoadFinished(url.toString());
            },
            onProgressChanged: (controller, progress) {
              if (widget.onWebProgress != null) {
                widget.onWebProgress!(progress);
              }
            },
            onLoadError: (controller, Uri? url, int code, String message) {
              if (widget.onWebResourceError != null) {
                widget.onWebResourceError!(message);
              }
            },
            onUpdateVisitedHistory: (controller, url, androidIsReload) {},
            onConsoleMessage: (controller, consoleMessage) {
              print(consoleMessage);
            },
          ),
        ),
        Container(
          height: ScreenUtil().bottomBarHeight + 50.0,
          color: Colors.white,
          child: Column(
            children: [
              Expanded(
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: <Widget>[
                    ElevatedButton(
                      child: Icon(Icons.arrow_back),
                      onPressed: () {
                        webViewController?.goBack();
                      },
                    ),
                    SizedBox(
                      width: 25.0,
                    ),
                    ElevatedButton(
                      child: Icon(Icons.arrow_forward),
                      onPressed: () {
                        webViewController?.goForward();
                      },
                    ),
                    SizedBox(
                      width: 25.0,
                    ),
                    ElevatedButton(
                      child: Icon(Icons.refresh),
                      onPressed: () {
                        // callJSMethod();
                        webViewController?.reload();
                      },
                    ),
                  ],
                ),
              ),
              Container(
                height: ScreenUtil().bottomBarHeight,
              ),
            ],
          ),
        ),
      ],
    );
  }
}