在U3D開發(fā)過(guò)程中經(jīng)常使用到多場(chǎng)景的切換，有同步SceneManager.LoadScene()和異步SceneManager.LoadSceneAsync()兩種方法，同步的話一般就會(huì)卡住界面直到加載完成，使用異步的話一般都做一個(gè)加載的進(jìn)度條，每次切換的時(shí)候都需要一個(gè)加載動(dòng)畫，所以需要建一個(gè)專門的過(guò)渡加載場(chǎng)景來(lái)進(jìn)行統(tǒng)一加載，也可以避免場(chǎng)景直接切換出現(xiàn)的黑屏。

一、建立一個(gè)單例進(jìn)行切換，在項(xiàng)目代碼的任何位置都可以調(diào)用

public class LoadSceneManager 
{
    private static LoadSceneManager instance;
    public static LoadSceneManager Instance
    {
        get {
            if (instance == null)
            {
                instance = new LoadSceneManager();
            }
            return instance;
        }
    }

    public string nextSceneName;

    //異步加載
    public void LoadSceneAsync(string sceneName)
    {
        Debug.Log("LoadSceneAsync:" + sceneName);
        nextSceneName = sceneName;
        SceneManager.LoadScene("LoadingScene");
    }
    public void LoadScene(string sceneName)
    {
        Debug.Log("LoadScene:" + sceneName);
        SceneManager.LoadScene(sceneName);
    }

}

使用的時(shí)候直接使用LoadSceneManager.Instance.LoadSceneAsync("SecondScene");

二、異步加載的過(guò)程

要做個(gè)進(jìn)度條然后進(jìn)行管理，代碼很簡(jiǎn)單就不說(shuō)了

public class LoadingController : MonoBehaviour
{
    public Slider loadingSlider;
    public TMP_Text loadingText;
    private AsyncOperation asyncOperation;
    private float operationProgress;

    // Start is called before the first frame update
    void Start()
    {
        loadingSlider.value = 0.0f;
        if (SceneManager.GetActiveScene().name == "LoadingScene")
        {
            StartCoroutine("LoadingScene");
        }
    }

    IEnumerator LoadingScene()
    {
        asyncOperation = SceneManager.LoadSceneAsync(LoadSceneManager.Instance.nextSceneName);
        asyncOperation.allowSceneActivation = false;
        yield return asyncOperation;
    }

    // Update is called once per frame
    void Update()
    {
        operationProgress = asyncOperation.progress;
        //最大值只到0.9，后面有進(jìn)行插值運(yùn)算更新
        if (Mathf.Approximately(operationProgress, 0.9f))
        {
            operationProgress = 1;
        }
        if (Mathf.Approximately(operationProgress, 0.6f))
        {
            System.Threading.Thread.Sleep(5000);
        }
        UpdateLoadingUI(operationProgress);
    }
    private void UpdateLoadingUI(float value)
    {
        if (operationProgress != loadingSlider.value)
        {
            loadingSlider.value = Mathf.Lerp(loadingSlider.value, operationProgress, Time.deltaTime * 2);
            if (Mathf.Approximately(operationProgress, operationProgress))
            {
                loadingSlider.value = operationProgress;
            }
        }
        Debug.Log("Progress:" + loadingSlider.value);
        if (loadingText != null)
        {
            loadingText.text = Mathf.Round(loadingSlider.value * 100) + "%";
        }

        //自動(dòng)換場(chǎng)景
        if (Mathf.Approximately(loadingSlider.value, 1.0f))
        {
            asyncOperation.allowSceneActivation = true;
        }
    }
}

三、demo鏈接

https://download.csdn.net/download/emailforwei/87329335

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