Unity3D手游开发日记(3)

我以为做个进度条很简单,分分钟解决,结果折腾了一天才搞定,Unity有很多坑,要做完美需要逐一解决.

问题1:最简单的方法不能实现100%的进度

用最简单的方法来实现,不能实现100%的进度,原因是Unity加载完新场景立马就激活新场景了,无法显示最后的进度.解决办法就是使用allowSceneActivation来控制进入场景的时机.

问题2:使用allowSceneActivation后进度卡在90%

这个问题官网论坛也有人讨论,解决办法就是自己手动修补最后的10%,

问题3:进度条一顿一顿地增加.不平滑

解决办法手动插值平滑

问题4:www和LoadLevelAsync两部分进度的整合问题

大部分场景是打成Bundle包的,先要WWW加载,再LoadLevelAsync,两部分的进度要整合在一起,

少量场景是不打Bundle包的,比如登录场景,

if (nextSceneID == (int)GlobeEnum.SceneDefine.LOGIN)
    yield return StartCoroutine(LoadNormalScene(sceneTable.ResName));
else
    yield return StartCoroutine(LoadBundleScene(sceneTable.ResName));

问题5:用yield return null代替Update()来处理每帧的进度界面更新.

用yield return null来处理更新,比如在Update函数里面处理,代码更简洁,但是要注意一个问题就是while死循环的问题

每个while的地方必须要对应一个yield return null,

经过以上处理,进度条看起来完美了很多,终于能满足我这个完美主义者的要求了. (o_o)

代码如下:

IEnumerator LoadNormalScene(string sceneName, float startPercent = 0)
{
    GameRoot.Instance.CurrentSceneId = (int)LoadingWindow.nextSceneID;

    loadingText.text = "加载场景中...";

    int startProgress = (int)(startPercent * 100);
    int displayProgress = startProgress;
    int toProgress = startProgress;
    AsyncOperation op = Application.LoadLevelAsync(sceneName);
    op.allowSceneActivation = false;
    while (op.progress < 0.9f)
    {
        toProgress = startProgress + (int)(op.progress * (1.0f - startPercent) * 100);
        while (displayProgress < toProgress)
        {
            ++displayProgress;
            SetProgress(displayProgress);
            yield return null;
        }
        yield return null;
    }

    toProgress = 100;
    while (displayProgress < toProgress)
    {
        ++displayProgress;
        SetProgress(displayProgress);
        yield return null;
    }
    op.allowSceneActivation = true;
}

IEnumerator LoadBundleScene(string sceneName)
{
    string path = BundleManager.GetBundleLoadPath(BundleManager.PathSceneData, sceneName + ".data");
    WWW www = new WWW(path);

    loadingText.text = "加载资源包中...";
    int displayProgress = 0;
    int toProgress = 0;
    while (!www.isDone)
    {
        toProgress = (int)(www.progress * m_BundlePercent * 100);
        while (displayProgress < toProgress)
        {
            ++displayProgress;
            SetProgress(displayProgress);
            yield return null;
        }
        yield return null;
    }

    toProgress = (int)(m_BundlePercent * 100);
    while (displayProgress < toProgress)
    {
        ++displayProgress;
        SetProgress(displayProgress);
        yield return null;
    }

    yield return www;
    if (null != www.assetBundle)
    {
        m_LastSceneBundle = www.assetBundle;
        yield return StartCoroutine(LoadNormalScene(sceneName, m_BundlePercent));
    }
}

void SetProgress(int progress)
{
    loadingBar.value = progress * 0.01f;
    loadingProgress.text = progress.ToString() + " %";
}

LoadNoramlScene表示加载没有打包的场景

LoadBundleScene表示加载打包的场景

m_BundlePercent表示加载bundle包占总进度的百分比,默认0.7f