What's the best approach to restore a view "state" when user choose to go back.
For example, a first view "UserList" witch contains a listview of many contacts, and a second view with contact details . How to retrieve the state (including scrollview position etc...) when user back to "UserList" view ?
Finally, the simple way is to use
NavigationCacheMode = NavigationCacheMode.Enabled
in the code behind page.
You should use in the Content of the SplitView a Frame, with that when you go back it will restore the previous content with the same information, I strongly recommend you to take a look to the https://github.com/Microsoft/Windows-universal-samples And look for the example about XAMLNavigation it includes all the matter about navigation.
Apart of course I recommend you to use MVVM and bind all the properties you want to store like the Contacts, etc.
What Juan Pablo is telling you about using MVVM is a good point! Best way is to 'store / cache' the ViewModel when navigating away and retrieving it again when you navigate back.
If you don't want to set the NavigationCacheMode for your view ( because setting this will acquire more memory ), you can use the ListViewPersistenceHelper to retain ListView scroll positions!
An example of that is up on Shawn Skendrot his blog here http://visuallylocated.com/post/2015/07/23/Persist-ListView-scroll-position-without-setting-NavigationCacheMode.aspx