This is a small sample application showing how to custom a Navigation Page (Toolbar on Android or UINavigationBar on iOS) this sample is in response to a question in StackOverflow you can see this question here:
How to Add a Gradient in Xamarin forms Toolbar and UINavigationBar
Built with C# 6 features, you must be running VS 2015 or VS 2017 to compile.
Built with Xamarin.Forms with support for:
iOS
Android