如题，webview_flutter的动态高度计算，解决方案有二种。
解决方案1，掘金这篇文章讲明白了，计算准确，方案是：js和flutter通信，看这位大神的就行了。
地址如下：
https://juejin.cn/post/7056353175900520462
下面的是我自己写的demo，可看可不看
顶部声明变量
//WebView 需要的变量属性如下，缺一不可
double _webViewHeight = 0;
String _htmlString = "";
final String _html1 = """
<!DOCTYPE html>
<html>
<meta content="width=device-width,initial-scale=1.0, maximum-scale=0.5, user-scalable=0" name="viewport"/>
<meta name="apple-mobile-web-app-capable" content="no" />
<meta name="format-detection" content="telephone=no,email=no,adress=no"/>
<body>
""";
final String _html2 = """
</body>
<script type="text/javascript">
const resizeObserver = new ResizeObserver(entries =>
flutterMessage.postMessage(document.body.scrollHeight.toString()));
resizeObserver.observe(document.body);
</script>
</html>
""";
网络数据拿到html富文本代码
_htmlString = "网络请求回来的html代码";
///商品详情页里的 富文本，使用webview进行加载
Widget _buildGoodsDescribeImgView(){
if(_detailsModel!.bewrite.isNotEmpty){
_htmlString = _html1 + _detailsModel!.bewrite + _html2;
return SizedBox(
width: WYSizeFit.screenWidth,
height: _webViewHeight,
child: WebView(
javascriptMode: JavascriptMode.unrestricted,
onWebViewCreated: (WebViewController controller) {
//如果加载的是html情况
controller.loadHtmlString(_htmlString);
},
onPageFinished: (url) async {
},
//JavascriptChannel来进行交互
javascriptChannels: <JavascriptChannel>{
//参数为Set，可以传入多个JavascriptChannel，根据name作为哈希值
JavascriptChannel(
name: 'flutterMessage',
onMessageReceived: (JavascriptMessage message) {
_webViewHeight = double.parse(message.message) * 0.5;
_webViewHeight += 20;
setState(() {
});
},
),
},
),
);
}
return const SizedBox(width: 0,height: 0,);
}
