Unity异步加载场景

当使用异步加载场景时，progress的值永远都不会达到1，当到达0.9时直接跳转场景，使进度条看上去很不平滑，可以通过以下的写法完善异步加载的进度条

一：第一种方法

将此脚本挂载到进度条身上

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

public class LoadGame : MonoBehaviour
{
    private Slider loadingSlider;//加载进度条

    private void Start()
    {
        loadingSlider = GetComponent();

        StartCoroutine(LoadScene());
    }

    //加载场景
    private IEnumerator LoadScene()
    {
        int displayProgress = 0;
        int toProgress = 0;
        AsyncOperation op = SceneManager.LoadSceneAsync(2);
        op.allowSceneActivation = false;
        while (op.progress < 0.9f)
        {
            toProgress = (int)op.progress * 100;
            while (displayProgress < toProgress)
            {
                ++displayProgress;
                SetLoadingPercentage(displayProgress);
                yield return new WaitForEndOfFrame();
            }
        }

        toProgress = 100;
        while (displayProgress < toProgress)
        {
            ++displayProgress;
            SetLoadingPercentage(displayProgress);
            yield return new WaitForEndOfFrame();
        }
        op.allowSceneActivation = true;
    }

    //设置进度条百分比
    private void SetLoadingPercentage(float v)
    {
        loadingSlider.value = v / 100;
    }
}

---

二：第二种方法

将此脚本挂载到进度条身上

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

public class LoadGame : MonoBehaviour
{
    private Slider loadingSlider;//加载进度条

    private AsyncOperation async;//异步加载的返回值

    private int nowprocess = 0;//当前进度

    void Start()
    {
        loadingSlider = GetComponent();

        StartCoroutine(LoadScene());
    }

    //加载场景
    IEnumerator LoadScene()
    {
        async = SceneManager.LoadSceneAsync(2);
        async.allowSceneActivation = false;//设置加载完成后不能自动跳转场景
        yield return async;
    }

    void Update()
    {
        if (async == null)
        {
            return;
        }

        int toProcess;//进度条需要到达的进度值

        if (async.progress < 0.9f)
        {
            toProcess = (int)(async.progress * 100);
        }
        else
        {
            toProcess = 100;
        }

        if (nowprocess < toProcess)
        {
            nowprocess++;
        }

        // 设置滑动条的value
        loadingSlider.value = nowprocess / 100f;

        //如果滑动条的值等于100，说明加载完毕
        if (nowprocess == 100)
        {
            async.allowSceneActivation = true;
        }
    }
}