处理AB包的依赖问题(Unity)

创建一个依赖关系的类 存放依赖项和被引用项 

创建两个字典储存包 和 依赖关键  包名为key

然后就是递归加载   内部先处理好包依赖 最后统一加载 

  public IEnumerator LoadAssetBundle(string bundleName)
        {
            if (!_DicABRelation.ContainsKey(bundleName)) {
                _DicABRelation.Add(bundleName, new ABRelation(bundleName));
            }
            yield return AddBundleDepend(bundleName);
            if (!_DicSingleABLoaderCache.ContainsKey(bundleName))
            {
                Debug.Log("加载包 : "+bundleName);
                _CurrentSinglgABLoader = new SingleABLoader(bundleName, CompleteLoadAB);
                _DicSingleABLoaderCache.Add(bundleName, _CurrentSinglgABLoader);
                yield return _CurrentSinglgABLoader.LoadAssetBundle();
            }

        }

        // 添加这个包所依赖其它包的信息
        private IEnumerator AddBundleDepend(string bundleName) {
            var DependeInfo = ABManifestLoader.GetInstance().RetrivalDependce(bundleName);
            foreach (var dependBundleName in DependeInfo)
            {
                _DicABRelation[bundleName].AddDependence(dependBundleName);
                yield return AddBundleRefrence(bundleName,dependBundleName);
            }
        }

        // 添加这个包被引用的信息
        private IEnumerator AddBundleRefrence(string bundleName, string dependBundleName) {
            if (!_DicABRelation.ContainsKey(dependBundleName))
            {
                _DicABRelation.Add(dependBundleName, new ABRelation(dependBundleName));
                Debug.Log("添加包引用 : "+ dependBundleName);

                yield return LoadAssetBundle(dependBundleName);
            }
            _DicABRelation[dependBundleName].AddReference(bundleName);

        }