Navigation.PopAsync暂时显示旧页面

Question

I am calling Navigation.PopAsync to call the previous page. But, on the OnAppearing method of the previous page, I am refreshing data of listview by setting itemssource. But when calling popasync I am able to see the previous page with old data for a moment. After a moment the page refreshes and shows the correct data. Is there any way to hide the old data being shown?

Answer 1

You could add bool DataLoaded property which implements OnPropertyChanged to your view model. Then bind this property to yours page Content.IsVisibleProperty . When you start refreshing your data simply set DataLoaded to false , and after it finishes set it to true . You could also add an ActivityIndicator for a better user experience ( http://developer.xamarin.com/api/type/Xamarin.Forms.ActivityIndicator )

See Data Binding chapter: http://developer.xamarin.com/guides/cross-platform/xamarin-forms/introduction-to-xamarin-forms/

Answer 2

I removed listview in OnDisappearing method. Now, It is working correctly. It does not show old data any more.