unity中有一个 WWW.LoadFromCacheOrDownload(url, int)的方法，简单讲就是从服务器上加载，如果本地缓存对应的版本号有这个资源，则从本地加载。文章源自大腿Plus-https://www.shijunzh.com/archives/518
没有或则传入的版本号不对则从服务器上加载。文章源自大腿Plus-https://www.shijunzh.com/archives/518
那么 坑就来了。文章源自大腿Plus-https://www.shijunzh.com/archives/518
unity说这个版本号是自动维护的，可是我们没有办法控制，那我们怎么能传入这个值呢。 找了一些方法，大体的思路如下，后面会写上代码。文章源自大腿Plus-https://www.shijunzh.com/archives/518
在本地打包，新建一个xml文档，保存这个包的hash128值，到文档中，再把这个文档也打包，都上传到服务器上。文章源自大腿Plus-https://www.shijunzh.com/archives/518
每次先从服务器上获取这个xml文档，然后把对应的hash128值作为验证来判断，hash128是另外一个重载方法的参数。文章源自大腿Plus-https://www.shijunzh.com/archives/518
<?xml version="1.0" encoding="UTF-8"?> <AssetBundleConfig> <Category Name="交通运输" HashCode="c4cde5fcf0d047ee3bdbe823128208cb" /> <Category Name="动力设施" HashCode="a3b487a32e63a9d84fbaeb0061966d8c" /> <Category Name="建筑及构筑物库" HashCode="a121fb8280b7f5a65083086d448bd16f" /> <Category Name="施工机械" HashCode="33d29373021741f67ba6671c23ca3358" /> <Category Name="材料及构件堆场" HashCode="73cbfe3ed7b7ba9608e1e8ad4590d80f" /> <Category Name="管线绿化" HashCode="34e9474e2d9ac64424a0a369e4024776" /> </AssetBundleConfig>
下面这个是打包并且写入xml文档的代码文章源自大腿Plus-https://www.shijunzh.com/archives/518
using UnityEngine;
using System.Collections;
using System.Configuration;
using System.IO;
using System.Xml;
using System.Xml.Serialization;
using UnityEditor;
public class ExportAssetBundles : MonoBehaviour
{
[MenuItem("AssetBundle/Build Asset Bundles")]
static void BuildABs()
{
// Put the bundles in a folder called "ABs" within the Assets folder.
BuildPipeline.BuildAssetBundles("Assets/AssetBundles", BuildAssetBundleOptions.None, BuildTarget.StandaloneWindows64);
CreateOrUpdateConfig();
}
/// <summary>
/// 将存在的ab包获取HashCode放入xml文件
/// </summary>
[MenuItem("AssetBundle/CreateOrUpdateConfig")]
public static void CreateOrUpdateConfig()
{
string filePath = Application.dataPath + "/versionConfig.xml";
//如果文件不存在
if (!File.Exists(filePath))
{
XmlDocument xmlDocument = new XmlDocument();
XmlDeclaration xmlDeclaration = xmlDocument.CreateXmlDeclaration("1.0", "UTF-8", null);
xmlDocument.AppendChild(xmlDeclaration);
var root = xmlDocument.CreateElement("AssetBundleConfig");
xmlDocument.AppendChild(root);
SaveXmlConfig(filePath, xmlDocument, root);
}
else
{
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Load(filePath);
var xmlRootNode = xmlDocument.SelectSingleNode("AssetBundleConfig");
if (xmlRootNode != null && !xmlRootNode.HasChildNodes)
return;
xmlRootNode.RemoveAll();
SaveXmlConfig(filePath, xmlDocument, xmlRootNode);
}
AssetDatabase.Refresh();
Debug.Log("保存或修改成功");
BuildPipeline.BuildAssetBundles("Assets/AssetBundles", BuildAssetBundleOptions.None, BuildTarget.StandaloneWindows64);
}
private static void SaveXmlConfig(string filePath, XmlDocument xmlDocument, XmlNode xmlRootNode)
{
//循环
AssetDatabase.RemoveUnusedAssetBundleNames();
var assetBundles = AssetDatabase.GetAllAssetBundleNames();
//var asset = AssetBundle.LoadFromFile(Application.streamingAssetsPath + "/AssetBundles/AssetBundles");
var asset = AssetBundle.LoadFromFile(Application.dataPath + "/AssetBundles/AssetBundles");
//这个字符串是固定写法
AssetBundleManifest assetBundleManifest = asset.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
asset.Unload(false);
foreach (var item in assetBundles)
{
if (item == "versionconfig.unity3d")
continue;
var assetBundle = AssetBundle.LoadFromFile(Application.dataPath + "/AssetBundles/" + item);
if (!assetBundle) continue;
var xmlElement = xmlDocument.CreateElement("Category");
xmlElement.SetAttribute("Name", item.Split('.')[0]);
var hashCode = assetBundleManifest.GetAssetBundleHash(item);
xmlElement.SetAttribute("HashCode", hashCode.ToString());
xmlRootNode.AppendChild(xmlElement);
assetBundle.Unload(true);
}
xmlDocument.Save(filePath);
}
}
下面的则是读取了，下面的代码涉及到公司项目，所以不能直接运行，注意文章源自大腿Plus-https://www.shijunzh.com/archives/518
private Dictionary<string, Hash128> _elementHash128Dic;
void Awake()
{
_elementHash128Dic = new Dictionary<string, Hash128>();
}
public IEnumerator Load()
{
//while (!Caching.ready)
// yield return null;
//Caching.CleanCache();
//先获取服务器版本
using (var www = new WWW(url地址自己写))
{
yield return www;
if (!string.IsNullOrEmpty(www.error))
{
Debug.Log(www.error);
yield break;
}
var assetBundle = www.assetBundle;
var request = assetBundle.LoadAssetAsync<TextAsset>("versionconfig");
yield return request;
if (request.isDone)
{
_elementHash128Dic.Clear();
var textAsset = request.asset as TextAsset;
var xmlDocument = new XmlDocument();
if (textAsset != null) xmlDocument.LoadXml(textAsset.text);
var elements = xmlDocument.GetElementsByTagName("Category");
for (int i = 0; i < elements.Count; i++)
{
_elementHash128Dic.Add(elements[i].Attributes["Name"].Value, Hash128.Parse(elements[i].Attributes["HashCode"].Value));
}
}
}
foreach (var category in Enum.GetNames(typeof(SiteElementCategory)))
{
Hash128 hash;
if (_elementHash128Dic.TryGetValue(category, out hash))
{
yield return LoadBundle(category, hash);
}
}
}
private IEnumerator LoadBundle(string category, Hash128 assetBundleHash128)
{
//category这个参数主要是用来拼接URL下载地址的
var www = WWW.LoadFromCacheOrDownload(url, assetBundleHash128);
//var www = WWW.LoadFromCacheOrDownload(url, 1);
yield return www;
if (!string.IsNullOrEmpty(www.error))
//....后面自己写吧，没啥差别了。
}
嗯。基本上就这样。文章源自大腿Plus-https://www.shijunzh.com/archives/518
就这样。有问题可以给我留言。文章源自大腿Plus-https://www.shijunzh.com/archives/518
端午快到了，祝大家端午安康，没有BUG。文章源自大腿Plus-https://www.shijunzh.com/archives/518
快吃饭了， 我觉得下载时可以试试UnityWebRequest好像会更好一点。文章源自大腿Plus-https://www.shijunzh.com/archives/518
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