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If I only used the RelativeScrollY or ScrollY values, the views would translate linear with the content, keeping page. Instead, I want them to scroll a little slower, thus creating the parallax effect. To do this, I wrote the ScrollValueConverter, a value converter. To tweak the animation effect I pass in several arguments, semi-colon delimited.
The easiest way to get values such as the scroll X/Y, relative scroll X/Y, and percentage scroll X/Y is using a behavior from the awesome XAML animation library Xamanimation. Xamanimation is a library that leverages all the built-in APIs of Xamarin.Forms to make complex animations with ease.