从Xamarin.Forms中的共享项目特定平台获取自定义视图渲染器中的数据

I am developing a mobile application using Xamarin.Forms. In my application, I am implementing custom camera using a custom view. I have successfully implemented the custom camera view. What I am trying to do now is, I would like to retrieve some data from custom view renderer in the platform-specific when a button is clicked which is inside the shared project. See my scenario below.I am developing a mobile application using Xama