private static INavigationService CreateNavigationService() { var navigationService = new AppNavigationService(); navigationService.Configure(ViewKeys.ShellViewKey, typeof(ShellView)); navigationService.Configure(ViewKeys.SearchViewKey, typeof(SearchView)); navigationService.Configure(ViewKeys.ProgressViewKey, typeof(ProgressView)); navigationService.Configure(ViewKeys.CalendarViewKey, typeof(CalendarView)); navigationService.Configure(ViewKeys.SettingViewKey, typeof(SettingView)); navigationService.Configure(ViewKeys.SubjectViewKey, typeof(SubjectView)); return(navigationService); }