I started Xamarin.Forms and it is great with MVVM pattern.
As main page I use NavigationPage and navigate with PushAsync and PopAsync brteen different pages. This works great if the phone stays in the same orientation. If I rotate screen, Xamarin shows always the first page after rotation.
How can I prevent this? I want to support the screen rotation and don't loose the navigation stack after rotation.
This is possible when running Android. Make sure that your MainActivity class has the ConfigurationChanges attributes. Here is an example:
[Activity(Label = "MYProject.Droid", Icon = "@drawable/icon", Theme = "@style/MyTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]