unity5.X AB包打包插件研究

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这里写图片描述

AssetBundleManager中的Update方法，是程序前进的推动者，因为update方法是逐帧执行，时刻的都在观察执行

    void Update()    {        var keysToRemove = new List<string>();        //检查所有正在下载的WWW，是否已经下载完毕        foreach (var keyValue in m_DownloadingWWWs)        {            WWW download = keyValue.Value;            if (download.error != null)            {                m_DownloadingErrors.Add(keyValue.Key, download.error);                keysToRemove.Add(keyValue.Key);                continue;            }            // 如下载完成，进行封装保存到字典中            if(download.isDone)            {                //Debug.Log("Downloading " + keyValue.Key + " is done at frame " + Time.frameCount);                m_LoadedAssetBundles.Add(keyValue.Key, new LoadedAssetBundle(download.assetBundle) );                keysToRemove.Add(keyValue.Key);            }        }        // 从字典中移除已经下载完成的WWW，并且对WWW进行释放        foreach( var key in keysToRemove)        {            WWW download = m_DownloadingWWWs[key];            m_DownloadingWWWs.Remove(key);            download.Dispose();        }        // 检查是否可以从AB包中下载资源        for (int i=0;i<m_InProgressOperations.Count;)        {            if (!m_InProgressOperations[i].Update())            {                //处理完就移掉                m_InProgressOperations.RemoveAt(i);            }            else            {                //当前暂不处理，接着处理下一个                i++;            }        }    }

上面代码中这行代码m_InProgressOperations[i].Update()

其中Update 里面代码：就是看 AB包是不是已经下载完成，如果下载完成，就开始异步加载AB包中的资源（asset）

public class AssetBundleLoadAssetOperationFull : AssetBundleLoadAssetOperation{    protected string                m_AssetBundleName;    protected string                m_AssetName;    protected string                m_DownloadingError;    protected System.Type           m_Type;    protected AssetBundleRequest    m_Request = null;    public AssetBundleLoadAssetOperationFull (string bundleName, string assetName, System.Type type)    {        m_AssetBundleName = bundleName;        m_AssetName = assetName;        m_Type = type;    }    public override T GetAsset<T>()    {        if (m_Request != null && m_Request.isDone)            return m_Request.asset as T;        else            return null;    }    public override bool Update ()    {        if (m_Request != null)            return false;        LoadedAssetBundle bundle = AssetBundleManager.GetLoadedAssetBundle (m_AssetBundleName, out m_DownloadingError);        if (bundle != null)        {            m_Request = bundle.m_AssetBundle.LoadAssetAsync (m_AssetName, m_Type);            return false;        }        else        {            Debug.Log("说明还在下AssetBundle");            return true;        }    }    public override bool IsDone ()    {        if (m_Request == null && m_DownloadingError != null)        {            Debug.LogError(m_DownloadingError);            return true;        }        return m_Request != null && m_Request.isDone;    }}

总体思想：

WWW下载，并将WWW对象保存字典
WWW下载完成，取出Assetbundle，封装到LoadedAssetBundle对象中，将封装对象保存字典中
开始异步加载AseetBundle中的asset
记载完成后，开始实例化

FR:海涛高软（QQ技术交流群：386476712）

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