A MvxViewModel that works with ReactiveUI

ReactiveMvxViewModel.cs

using System;
using System.Threading.Tasks;
using MvvmCross.ViewModels;
using ReactiveUI;

namespace ReactiveUI.Mvx
{
    public abstract class ReactiveMvxViewModel : ReactiveObject, IMvxViewModel
    {
        public virtual void ViewCreated()
        {
        }

        public virtual void ViewAppearing()
        {
        }

        public virtual void ViewAppeared()
        {
        }

        public virtual void ViewDisappearing()
        {
        }

        public virtual void ViewDisappeared()
        {
        }

        public virtual void ViewDestroy(bool viewFinishing = true)
        {
        }

        public void Init(IMvxBundle parameters)
        {
            InitFromBundle(parameters);
        }

        public void ReloadState(IMvxBundle state)
        {
            ReloadFromBundle(state);
        }

        public virtual void Start()
        {
        }

        public void SaveState(IMvxBundle state)
        {
            SaveStateToBundle(state);
        }

        protected virtual void InitFromBundle(IMvxBundle parameters)
        {
        }

        protected virtual void ReloadFromBundle(IMvxBundle state)
        {
        }

        protected virtual void SaveStateToBundle(IMvxBundle bundle)
        {
        }

        public virtual void Prepare()
        {
        }

        public virtual Task Initialize()
        {
            return Task.FromResult(true);
        }

        private MvxNotifyTask _initializeTask;
        public MvxNotifyTask InitializeTask
        {
            get => _initializeTask;
            set => this.RaiseAndSetIfChanged(ref _initializeTask, value);
        }
        
    }
    
    public abstract class ReactiveMvxViewModel<TParameter> : ReactiveMvxViewModel, IMvxViewModel<TParameter>
        where TParameter : notnull
    {
        public abstract void Prepare(TParameter parameter);
    }

    //TODO: Not possible to name MvxViewModel, name is MvxViewModelResult for now
    public abstract class ReactiveMvxViewModelResult<TResult> : ReactiveMvxViewModel, IMvxViewModelResult<TResult>
        where TResult : notnull
    {
        public TaskCompletionSource<object> CloseCompletionSource { get; set; }

        public override void ViewDestroy(bool viewFinishing = true)
        {
            if (viewFinishing && CloseCompletionSource != null && !CloseCompletionSource.Task.IsCompleted && !CloseCompletionSource.Task.IsFaulted)
                CloseCompletionSource?.TrySetCanceled();

            base.ViewDestroy(viewFinishing);
        }
    }

    public abstract class ReactiveMvxViewModel<TParameter, TResult> : ReactiveMvxViewModelResult<TResult>, IMvxViewModel<TParameter, TResult>
        where TParameter : notnull
        where TResult : notnull
    {
        public abstract void Prepare(TParameter parameter);
    }
}