Theming a Xamarin.Forms application

Theme an application

Theming can be implemented in Xamarin.Forms applications by creating a ResourceDictionary for each theme, and then loading the resources with the DynamicResource markup extension.

Respond to system theme changes

Devices typically include light and dark themes, which each refer to a broad set of appearance preferences that can be set at the operating system level. Applications should respect these system themes, and respond immediately when the system theme changes.