Use webview load pie charts on ios platform will show blank page in first load, and changed reloadAfterInit to true have blow error.

[Onperson]

Unsupported Type: 45, WKJavaScriptExceptionMessage: TypeError: null is not an object (evaluating 't.getAttribute'), WKJavaScriptExceptionSourceURL: Unsupported Type: about:blank, NSLocalizedDescription: A JavaScript exception occurred, WKJavaScriptExceptionColumnNumber: Unsupported Type: 218226}), null)
#0 WKWebViewHostApiImpl.evaluateJavaScriptForInstances (package:webview_flutter_wkwebview/src/web_kit/web_kit_api_impls.dart:1167:7)

#1 WebKitWebViewController.runJavaScript (package:webview_flutter_wkwebview/src/webkit_webview_controller.dart:462:7)

#2 _EchartsState.init (package:flutter_echarts/flutter_echarts.dart:99:5)