unity3D中动态加载物体的常用的方法

Posted 2020-08-20

1.用Resources.Load（）；参数为路径，需要在Assets文件夹中创建Resources文件夹，通过路径去查找，实例化并加入到内存中去，通过Instantiate动态加载的方法来实现物体场景的加载；

2.使用AssetBundle打包预设或者场景可以将与其相关的所有资源打包，这样很好地解决资源的依赖问题

要先打包资源：

using UnityEngine;
using System.Collections;
using UnityEditor;
using System.IO;
public class AesstBundleTest : MonoBehaviour {

 

[MenuItem("Custom Bundle/Create Bundel Main")]
public static void creatBundleMain()
{
//获取选择的对象的路径
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();
}

}

把上面的代码放在Editor中，在菜单栏中就可以看见自定的菜单项，选中需要打包的预设，就可以把对应的预设打包并输出到StreamAssets中了

下面就是加载了：

using UnityEngine;
using System.Collections;

public class LoadBundleTest : MonoBehaviour {
//不同平台下StreamingAssets的路径是不同的，这里需要注意一下。
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;
}
}