Xamarin iOS - apply gradient background to status bar and navigation bar

How can I create a horizontal gradient background for my iOS nav bar? http://stackoverflow.com/a/31901915/580229

Using Background Image in Navigation Bar https://www.appcoda.com/customize-navigation-status-bar-ios-7/

How to programmatically get iOS status bar height http://stackoverflow.com/a/16598350/580229