/// <summary>
/// 获取Prefab
/// </summary>
public Entity GetPrefab(AssetRef Ref)
{
//如果Prefab已经加载出来了，直接返回，如果没有，就加载
if (collection.Contains(Ref))
{
return(collection[Ref]);
}
else
{
return(LoadPrefab(ref Ref));
}
}
/// <summary>
/// 将一个Prefab加载并转换成Entity
/// </summary>
protected Entity LoadPrefab(ref AssetRef Ref) //用ref是为了减少开销，虽然估计也没减少多少，回头可能会删？
{
var prefabGO = Ref.Get <GameObject>();
if (prefabGO == null)
{
throw new ArgumentException("Ref的类型必须是GameObject", "Ref");
}
//转换Prefab
var prefabEntity = GameObjectConversionUtility.ConvertGameObjectHierarchy(prefabGO,
GameObjectConversionSettings.FromWorld(this.World, store));
//为Prefab实体添加Prefab信息组件
EntityManager.AddComponentData(prefabEntity, new PrefabInfo()
{
Ref = Ref
});
EntityManager.AddComponentData(prefabEntity, new InitializingTag());
//Update系统组，对新的Prefab实体进行处理
this.Update();
EntityManager.RemoveComponent <InitializingTag>(prefabEntity);
return(prefabEntity);
}
/// <summary>
/// 通过AssetRef获得对应Entity
/// </summary>
public Entity this[AssetRef Ref] {
get => RefToEntity[Ref];