ProjectDDD/Assets/_DDD/_Scripts/GameUi/FadeUi.cs

using DG.Tweening;
using UnityEngine;

namespace DDD
{
    public class FadeUi : MonoBehaviour, IEventHandler<FadeInEvent>, IEventHandler<FadeOutEvent>
    {
        private CanvasGroup _canvasGroup;
        private GameObject _panel;

        private void Awake()
        {
            _canvasGroup = GetComponent<CanvasGroup>();
            _panel = transform.Find(CommonConstants.Panel).gameObject;
            
            _canvasGroup.alpha = 0f;
            _panel.SetActive(false);
        }

        private void OnEnable()
        {
            EventBus.Register<FadeInEvent>(this);
            EventBus.Register<FadeOutEvent>(this);
        }

        private void OnDisable()
        {
            EventBus.Unregister<FadeInEvent>(this);
            EventBus.Unregister<FadeOutEvent>(this);
        }

        public async void Invoke(FadeInEvent evt)
        {
            await _canvasGroup.DOFade(0f, evt.Duration)
                .SetUpdate(true)
                .AsyncWaitForCompletion();
            
            _panel.SetActive(false);
            
            evt.CompletionSource.SetResult(true);
        }

        public async void Invoke(FadeOutEvent evt)
        {
            _panel.SetActive(true);

            await _canvasGroup.DOFade(1f, evt.Duration)
                .SetUpdate(true)
                .AsyncWaitForCompletion();
            
            evt.CompletionSource.SetResult(true);
        }
    }
}