Health/Assets/Scripts/UI/LoadingManager.cs

using System;
using System.Collections;
using UnityEngine;
using UnityEngine.SceneManagement;

public class LoadingManager:MonoSingleton<LoadingManager>
{
    public void Load(string targetScene)
    {
        //string currentScene = SceneManager.GetActiveScene().name;
        var op = SceneManager.LoadSceneAsync("Loading", LoadSceneMode.Single);
        op.completed += (AsyncOperation obj) =>
        {
            StartCoroutine(LoadingScene(targetScene));
        };
    }

    private IEnumerator LoadingScene(string targetScene)
    {
        //演示用，正式版需要根据场景大小调整
        if (targetScene.Equals("YogaMain"))
        {
            yield return new WaitForSeconds(3f);
        }
        var loadNew = SceneManager.LoadSceneAsync(targetScene, LoadSceneMode.Single);
        loadNew.completed += (AsyncOperation obj2) =>
        {
            //fade in 
        };
    }
}