Example of how to pop to an arbitrary page within the navigation stack using view model first navigation

NavigationService.cs

public void PopTo<T>() where T : BaseViewModel
{
	var pagesToRemove = new List<Page>();
	var upper = FormsNavigation.NavigationStack.Count - 1;

	// Loop through the nav stack backwards
	for (int i = upper; i >= 0; i--)
	{
		var currentPage = FormsNavigation.NavigationStack[i] as IViewFor;

		// Stop the whole show if one of the pages isn't an IViewFor
		if (currentPage == null)
			return;

		// If we hit the view model type, break out
		if (currentPage.ViewModel.GetType() == typeof(T))
			break;

		// Finally - always add to the list
		pagesToRemove.Add(currentPage as Page);
	}

	// Remove everything from the stack
	foreach (var item in pagesToRemove)
	{
		FormsNavigation.RemovePage(item);
	}
}

Nice, I've figured out but your code looks much cleaner. Whats your comment on my code.

`Type RetrieveView (Type viewModelType)
{
// look up what type of view it corresponds to
var viewType = _viewModelViewDictionary [viewModelType];

        return viewType;
    }

    public async Task<bool> PopToPageAsync (Type viewModelType)
    {
        var viewType = (Type) RetrieveView (viewModelType);

        int i = FormsNavigation.NavigationStack.Count;

        bool pageExist = false;

        foreach (Page current in FormsNavigation.NavigationStack.Reverse()) {
            --i;
            if (current.GetType().Equals(viewType)) {

                int sourceIndex = FormsNavigation.NavigationStack.Count()-1;
                int destinationIndex = i+1;

                while (sourceIndex != destinationIndex) {
                    FormsNavigation.RemovePage (FormsNavigation.NavigationStack [--sourceIndex]);
                }
                pageExist = true;
                break;
            }
        }
        if (pageExist) {
            await FormsNavigation.PopAsync ();
        }
        return pageExist;
    }`