ProjectDDD/Assets/_Datas/02.Scripts/Controllers/GameManager.cs

using System;
using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.SceneManagement;

namespace DDD
{
    public enum SceneName
    {
        Title = 0,
        Restaurant = 1
    }
    
    public class GameManager : MonoBehaviour
    {
        private UiManager _uiManager;
        
        private void Awake()
        {
            _uiManager = FindAnyObjectByType<UiManager>();
        }

        public async void ChangeScene(SceneName sceneName)
        {
            string previousSceneName = SceneManager.GetActiveScene().name;
            string changeSceneName;

            switch (sceneName)
            {
                case SceneName.Title:
                    changeSceneName = "00.Title";
                    break;
                case SceneName.Restaurant:
                    changeSceneName = "01.Restaurant";
                    break;
                default:
                    throw new ArgumentOutOfRangeException(nameof(sceneName), sceneName, null);
            }

            await _uiManager.FadeIn();
            
            AsyncOperation loadSceneAsync = SceneManager.LoadSceneAsync(changeSceneName, LoadSceneMode.Additive);
            while (loadSceneAsync is { isDone: false })
                await Task.Yield();
            
            _uiManager.ChangeScene(previousSceneName, changeSceneName);
            
            await Task.Delay(1000);
            
            await _uiManager.FadeOut();
            
            Debug.Log($"씬 로드 및 전환 완료: {changeSceneName}");
        }
        
        public void ChangeSceneByIndex(int index)
        {
            var sceneEnum = (SceneName)index;
            ChangeScene(sceneEnum);
        }
    }
}