Unity异步加载场景(loading界面)

 跳转场景为A->BScene->Object3D_1

//A场景下跳转loading场景
public void LoadScene()
    {
        //最终加载的目标场景
        Globe.nextSceneName = "Object3D_1";
        //loading界面场景
        SceneManager.LoadScene("BScene");
    }

 BScene场景下脚本

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


public class Globe
{
    public static string nextSceneName;
}

public class AsyncLoadScene : MonoBehaviour {
    public Slider loadingSlider;

    public Text loadingText;

    private float loadingSpeed = 1;

    private float targetValue;

    private AsyncOperation operation;

    // Use this for initialization
    void Start()
    {
        loadingSlider.value = 0.0f;

        if (SceneManager.GetActiveScene().name == "BScene")
        {
            //启动协程
            StartCoroutine(AsyncLoading());
        }
    }

    IEnumerator AsyncLoading()
    {
        operation = SceneManager.LoadSceneAsync(Globe.nextSceneName);
        //阻止当加载完成自动切换
        operation.allowSceneActivation = false;

        yield return operation;
    }

    // Update is called once per frame
    void Update()
    {
        if (operation != null)
        {
            targetValue = operation.progress;

            if (operation.progress >= 0.9f)
            {
                //operation.progress的值最大为0.9
                targetValue = 1.0f;
            }

            if (targetValue != loadingSlider.value)
            {
                //插值运算
                loadingSlider.value = Mathf.Lerp(loadingSlider.value, targetValue, Time.deltaTime * loadingSpeed);
                if (Mathf.Abs(loadingSlider.value - targetValue) < 0.01f)
                {
                    loadingSlider.value = targetValue;
                }
            }

            loadingText.text = ((int)(loadingSlider.value * 100)).ToString() + "%";

            if ((int)(loadingSlider.value * 100) == 100)
            {
                //允许异步加载完毕后自动切换场景
                operation.allowSceneActivation = true;
            }
        }
    }
}