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    • unity3d Resources.Load動(dòng)態(tài)加載模型資源

    2019/1/22??????點(diǎn)擊：

    兩種加載資源方案：Resources.Load和AssetBundle Resources.Load就是從一個(gè)缺省打進(jìn)程序包里的AssetBundle里加載資源而一般AssetBundle文件需要你自己創(chuàng)建，運(yùn)行時(shí)動(dòng)態(tài)加載，可以指定路徑和來源的。其實(shí)場(chǎng)景里所有靜態(tài)的對(duì)象也有這么一個(gè)加載過程，只是Unity后臺(tái)替你自動(dòng)完成。

    Resources.Load方法：使用這種方式加載資源，首先需要下Asset目錄下創(chuàng)建一個(gè)名為Resources的文件夾，這個(gè)命名是U3D規(guī)定的方式，然后把資源文件放進(jìn)去，

    當(dāng)然也可以在Resources中再創(chuàng)建子文件夾，當(dāng)然在代碼加載時(shí)需要添加相應(yīng)的資源路徑，下面是一個(gè)簡(jiǎn)demo，兩個(gè)預(yù)設(shè)，Cube和Sphere，

    其中Cube放在Resource中的Prebs中，而Sphere放在Resources跟目錄下，下面分別實(shí)現(xiàn)Resources.Load資源的加載： 

    using UnityEngine;
using System.Collections;
public class LoadResDemo : MonoBehaviour {

    private string cubePath = "Prebs/MyCubePreb";
    private string spherePath = "MySpherePreb";
    void Start () {
        //把資源加載到內(nèi)存中
        Object  cubePreb = Resources.Load(cubePath, typeof(GameObject));
        //用加載得到的資源對(duì)象，實(shí)例化游戲?qū)ο螅瑢?shí)現(xiàn)游戲物體的動(dòng)態(tài)加載
        GameObject cube = Instantiate(cubePreb) as GameObject;
        //以下同理實(shí)現(xiàn)Sphere的動(dòng)態(tài)實(shí)例化
        //把資源加載到內(nèi)存中
        Object spherePreb = Resources.Load(spherePath, typeof(GameObject));
        //用加載得到的資源對(duì)象，實(shí)例化游戲?qū)ο螅瑢?shí)現(xiàn)游戲物體的動(dòng)態(tài)加載
        GameObject sphere = Instantiate(spherePreb) as GameObject;
    } 
    void Update () {   
    }
}
    將上面的腳本附加到某個(gè)游戲?qū)ο笊?，在運(yùn)行游戲時(shí)就可以看到場(chǎng)景中動(dòng)態(tài)創(chuàng)建的上面的游戲?qū)ο罅恕?/span>

    AssetBundle的方法動(dòng)態(tài)加載游戲?qū)ο?。使用AssetBundle打包預(yù)設(shè)或者場(chǎng)景可以將與其相關(guān)的所有資源打包，這樣很好地解決資源的依賴問題，使得我們可以方便的加載GameObject，首先需要打包資源： 

    using UnityEngine;
using System.Collections;
using UnityEditor;
using System.IO;
public class AesstBundleTest : MonoBehaviour {
    [MenuItem("Custom Bundle/Create Bundel Main")]
    public static void creatBundleMain()
    {
        //獲取選擇的對(duì)象的路徑
        Object[] os = Selection.GetFiltered(typeof(Object), SelectionMode.DeepAssets);
        bool isExist = Directory.Exists(Application.dataPath + "/StreamingAssets");
        if (!isExist)
        {
            Directory.CreateDirectory(Application.dataPath + "/StreamingAssets");
        }
        foreach (Object o in os)
        {
            string sourcePath = AssetDatabase.GetAssetPath(o);

            string targetPath = Application.dataPath + "/StreamingAssets/" + o.name + ".assetbundle";
            if (BuildPipeline.BuildAssetBundle(o, null, targetPath, BuildAssetBundleOptions.CollectDependencies))
            {
                print("create bundle cuccess!");
            }
            else
            {
                print("failure happen");
            }
            AssetDatabase.Refresh();
        }
    }
    [MenuItem("Custom Bundle/Create Bundle All")]
    public static void CreateBundleAll()
    {
        bool isExist = Directory.Exists(Application.dataPath + "/StreamingAssets");
        if (!isExist)
        {
            Directory.CreateDirectory(Application.dataPath + "/StreamingAssets");
        }
        Object[] os = Selection.GetFiltered(typeof(Object), SelectionMode.DeepAssets);
        if (os == null || os.Length == 0)
        {
            return;
        }
        string targetPath = Application.dataPath + "/StreamingAssets/" + "All.assetbundle";
        if (BuildPipeline.BuildAssetBundle(null, os, targetPath, BuildAssetBundleOptions.CollectDependencies))
        {
            print("create bundle all cuccess");
        }
        else
        {
            print("failure happen");
        }
        AssetDatabase.Refresh();
    }
}

    把上面的代碼放在Editor中，在菜單欄中就可以看見自定的菜單項(xiàng)，選中需要打包的預(yù)設(shè)，就可以把對(duì)應(yīng)的預(yù)設(shè)打包并輸出到StreamAssets中了，然后是動(dòng)態(tài)加載資源： 

    using UnityEngine;
using System.Collections;

public class LoadBundleTest : MonoBehaviour {
    //不同平臺(tái)下StreamingAssets的路徑是不同的，這里需要注意一下。
    public static readonly string PathURL =
    #if UNITY_ANDROID
        "jar:file://" + Application.dataPath + "!/assets/";
    #elif UNITY_IPHONE
        Application.dataPath + "/Raw/";
    #elif UNITY_STANDALONE_WIN || UNITY_EDITOR
    "file://" + Application.dataPath + "/StreamingAssets/";
    #else
        string.Empty;
    #endif  // Update is called once per frame
    void Update () {
    
    }
    void OnGUI()
    {
        if (GUILayout.Button("Load Bundle Main"))
        {
            string path_shpere = PathURL + "MySpherePreb.assetbundle";
            StartCoroutine(loadBundleMain(path_shpere));

            string path_cube = PathURL + "MyCubePreb.assetbundle";
            StartCoroutine(loadBundleMain(path_cube));
            print(path_cube);
        }

        if (GUILayout.Button("Load Bundle All"))
        {
            StartCoroutine(loadBundleAll(PathURL + "All.assetbundle"));
        }
    }

    private IEnumerator loadBundleMain(string path)
    {
        WWW bundle = new WWW(path);
      //  yield return bundle;
         Instantiate(bundle.assetBundle.mainAsset);
         bundle.assetBundle.Unload(false);
         yield return 1;
    }

    private IEnumerator loadBundleAll(string path)
    {
        WWW bundle = new WWW(path);
        yield return bundle;
        Instantiate(bundle.assetBundle.Load("MyCubePreb"));
        Instantiate(bundle.assetBundle.Load("MySpherePreb"));
        yield return 1;
    }
}