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Android 部分

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1.繼承 webviewClient and override OnReceiveError method

2.Custom Render the WebView

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iOS 部分

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1.繼承 WKWebview and override decidePolicyForNavigationResponse method

2.Custom Render the WebView

收到ErrorCode再發EventAggregator 或 MessagingCenter 觸發上層Root Page再轉發Error Page

參考來源 : https://docs.microsoft.com/zh-tw/xamarin/xamarin-forms/app-fundamentals/custom-renderer/hybridwebview