MvvmCross Windows Phone 8.1 BaseView

BaseView.cs

using System.Windows.Input;
using Windows.Phone.UI.Input;
using Windows.UI.Xaml.Navigation;
using Cirrious.MvvmCross.ViewModels;
using Cirrious.MvvmCross.WindowsCommon.Views;

namespace Lolz.WindowsPhone.Views
{
    public abstract class BaseView<T> : MvxWindowsPage<T> where T : MvxViewModel
    {
        private ICommand _goBackCommand;

        public ICommand GoBackCommand
        {
            get { return _goBackCommand ?? (_goBackCommand = new MvxCommand(GoBack, CanGoBack)); }
            set { _goBackCommand = value; }
        }

        protected BaseView()
        {
            NavigationCacheMode = NavigationCacheMode.Required;
            Loaded += (s, e) => {
                HardwareButtons.BackPressed += HardwareButtonsBackPressed;
            };

            Unloaded += (s, e) => {
                HardwareButtons.BackPressed -= HardwareButtonsBackPressed;
            };
        }

        private void HardwareButtonsBackPressed(object sender, BackPressedEventArgs e)
        {
            if (GoBackCommand.CanExecute(null))
            {
                e.Handled = true;
                GoBackCommand.Execute(null);
            }
        }

        public virtual void GoBack()
        {
            if (Frame != null && Frame.CanGoBack) Frame.GoBack();
        }

        public virtual bool CanGoBack()
        {
            return Frame != null && Frame.CanGoBack;
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            if (e.NavigationMode == NavigationMode.New)
                ViewModel = null;

            base.OnNavigatedTo(e);
        }
    }
}