This sample "CustomVision" is a demo of the new iOS 11 Vision framework and CoreML, using a model trained with Azure's Custom Vision Service.
This introduction to CoreML and the custom vision service explains the process and links to the Swift source that has been ported to C# with Xamarin.
The custom model has been trained to recognize differet varieties of fruit:
Xamarin port changes are released under the MIT license
Ported to Xamarin.iOS by Larry O'Brien, Craig Dunn