Custom renderer at Xamarin.Forms could find a OnElementChanged method

I'm trying to implement custom label and iOS renderer for it using Xamarin.Forms. For some reason code from sample is using method which is not in a base class:

OnElementChanged

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Any ideas how to fix?

Solution

It turned out that Xamarin.Forms SDK referenced by project template by default is not enough. You have to install additionally NUGET package Xamarin.Forms for your Touch Project:

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