02.webview_flutter Cookie 管理

在 webview_flutter 中，WebViewCookieManager 类负责 Cookie 管理。

设置 Cookie

Future<void> setCookie(WebViewCookie cookie) 
	=> platform.setCookie(cookie);

清空 Cookie

Future<bool> clearCookies() => platform.clearCookies();

实例代码：

Future<void> _onClearCookies(BuildContext context) async {
  final bool hadCookies = await cookieManager.clearCookies();
  String message = 'There were cookies. Now, they are gone!';
  if (!hadCookies) {
    message = 'There are no cookies.';
  }
  if (context.mounted) {
    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
      content: Text(message),
    ));
  }
}

获取 Cookies

Future<void> _onListCookies(BuildContext context) async {
  final String cookies = await webViewController
      .runJavaScriptReturningResult('document.cookie') as String;
  if (context.mounted) {
    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
      content: Column(
        mainAxisAlignment: MainAxisAlignment.end,
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          const Text('Cookies:'),
          _getCookieList(cookies),
        ],
      ),
    ));
  }
}

Widget _getCookieList(String cookies) {
  if (cookies == '""') {
    return Container();
  }
  final List<String> cookieList = cookies.split(';');
  final Iterable<Text> cookieWidgets =
      cookieList.map((String cookie) => Text(cookie));
  return Column(
    mainAxisAlignment: MainAxisAlignment.end,
    mainAxisSize: MainAxisSize.min,
    children: cookieWidgets.toList(),
  );
}

获取底层平台实现

WebViewCookieManager 的 platform 中包含了对应平台下的具体实现类，获取方法：

PlatformWebViewCookieManagerCreationParams params =
    const PlatformWebViewCookieManagerCreationParams();

if (WebViewPlatform.instance is WebKitWebViewPlatform) {
  params = WebKitWebViewCookieManagerCreationParams
      .fromPlatformWebViewCookieManagerCreationParams(
    params,
  );
} else if (WebViewPlatform.instance is AndroidWebViewPlatform) {
  params = AndroidWebViewCookieManagerCreationParams
      .fromPlatformWebViewCookieManagerCreationParams(
    params,
  );
}

final WebViewCookieManager webViewCookieManager =
    WebViewCookieManager.fromPlatformCreationParams(
  params,
);

网络资源

• [Flutter] How to use cookie with webview_flutter - Let's see how to use cookie in the webview that is shown by webview_flutter on Flutter.

本文作者：Maeiee

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