MainPage.xaml.cs

public partial class MainPage : ContentPage, IViewFor<MainViewModel>
{
    public MainPage()
    {
        InitializeComponent();
        ViewModel = new MainViewModel(new MovieService());
        this.Bind(ViewModel, vm => vm.SearchTerm, v => v.entryField.Text);
        this.OneWayBind(ViewModel, vm => vm.Results, v => v.resultList.ItemsSource);
        this.OneWayBind(ViewModel, vm => vm.IsSearching, v => v.loadingBar.IsVisible);
    }

    public MainViewModel ViewModel { get; set; }
    object IViewFor.ViewModel
    {
        get => ViewModel;
        set => ViewModel = (MainViewModel)value;
    }
}