Device.RuntimePlatform using with switch

RuntimePlatform.cs

switch (Device.RuntimePlatform)
            {
                case Device.iOS:
                    itemsPage = new NavigationPage(new ItemsPage())
                    {
                        Title = "Items"
                    };

                    aboutPage = new NavigationPage(new AboutPage())
                    {
                        Title = "About"
                    };
                    itemsPage.Icon = "tab_feed.png";
                    aboutPage.Icon = "tab_about.png";
                    break;
                default:
                    itemsPage = new CatalogPage()
                    {
                        Title = "Items"
                    };

                    aboutPage = new AboutPage()
                    {
                        Title = "About"
                    };
                    break;
            }