Unity异步加载场景与加载进度条

//异步加载新场景
public void LoadNewScene()
{
//保存需要加载的目标场景
Globe.nextSceneName = "Scene";

SceneManager.LoadScene("Loading");
}

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 == "Loading")
{
//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 ()
{
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;
}
}
}