Unity—Loading界面-异步加载场景

Loading界面-异步加载场景

Demo展示

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加载新场景时，需要加载大量模型外部文件等，比较耗时，又不能让画面卡住不动；

很多时候会做一个加载界面显示读条；

这个加载条是个UI物体，可以自行添加替换UI素材；

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代码

非常简直，就不赘述了；

一个slider条，progress为异步百分比；

限制读条3s结束，小于3s等待；

注意异步读条progress到不了1，所以0.9判断加载完成；

public class Loading : MonoBehaviour
{
    public string scenceName;
    
    AsyncOperation async;

    public Slider m_pProgress;

    private int progress = 0;

    private float time = 3f;
    private float startTime = 0;
    private void Start()
    {
        StartCoroutine(LoadScenes());
        startTime = Time.time;
    }

    IEnumerator LoadScenes()
    {
        int nDisPlayProgress = 0;
        async = SceneManager.LoadSceneAsync(scenceName);
        async.allowSceneActivation = false;
        while (async.progress < 0.9f)
        {
            progress = (int)async.progress * 100;
            while (nDisPlayProgress < progress)
            {
                ++nDisPlayProgress;
                m_pProgress.value = (float)nDisPlayProgress / 100;
                yield return new WaitForEndOfFrame();
            }
            
            yield return null;
        }

        progress = 100;
        while (nDisPlayProgress < progress)
        {
            ++nDisPlayProgress;
            m_pProgress.value = (float)nDisPlayProgress / 100;
            yield return new WaitForEndOfFrame();
        }
        
        float temp = Time.time - startTime;
        if (temp < time)
            yield return new WaitForSeconds(time - temp);
        
        async.allowSceneActivation = true;
    }
}

测试代码：

加载场景时，记在loading界面，设置需要加载的场景名称；

public class MainScence : MonoBehaviour
{
    public Button btnLoad;
    void Start()
    {
        btnLoad.onClick.AddListener(OnLoadFight);
    }

    private void OnLoadFight()
    {
        GameObject go = Instantiate(Resources.Load<GameObject>("Loading"), transform);
        go.GetComponent<Loading>().scenceName = "FightScence";
    }
}