Xamarin Forms - UWP - Item pages do not always render

mmurfinsimmons commented 4 years ago

I am trying to to use this to present a swipeable 'tabbed pages' wizard data-entry pages effect. ItemSource is set to an observable collection of custom complex contentview types (no template). On Android and IOS this works correctly. On UWP sometimes items appear 'blank' when navigated to from the tab-header or in code. If I touch+drag even a tiny bit then the blank view is rendered, or if I revisit the page 2nd time is fine.

  <cards:CarouselView x:Name="carousel"
                            HorizontalOptions="FillAndExpand"
                            IsCyclical="False"
                            ItemsSource="{Binding ResultWizardValidPages}"
                            IsUserInteractionEnabled="{Binding IsSwipingEnabled}"
                            IsVerticalSwipeEnabled="False"
                            SelectedIndex="{Binding CurrentPageIndex}"
                            SwipeThresholdDistance="25"
                            VerticalOptions="FillAndExpand" />

The 'pages' are created in code (many variations) (build up observable list).

addPage(checklistPage, STStyles.Res(Constants.STRING_PAGE_BUILDING_CHECKLISTS));
addPage(correctionPage, STStyles.Res(Constants.STRING_PAGE_BUILDING_CORRECTION));
addPage(attachmentPage, STStyles.Res(Constants.STRING_PAGE_ATTACHMENTS));
addPage(commentPage, STStyles.Res(Constants.STRING_PAGE_COMMENTS));
addPage(resultPage, STStyles.Res(Constants.STRING_PAGE_RESULTS));
addPage(summaryPage, STStyles.Res(Constants.STRING_PAGE_SUMMARY));