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一.简介

在之前的学习中我们发现Entity不能挂载相同的组件的.
当我们需要用相同的组件时则可以使用.IBufferElementData接口
动态缓冲区组件来实现

二.例子

1.创建IBufferElementData组件

using Unity.Entities;
using UnityEngine;
//[GenerateAuthoringComponent]
public struct BufferComponent8 : IBufferElementData
{
    public int dataA;
    public int dataB;
}

2.创建管理组件

using Unity.Entities;
using UnityEngine;
public class Authoring8 : MonoBehaviour, IConvertGameObjectToEntity
{
    public void Convert(Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem)
    {
        DynamicBuffer<BufferComponent8> tempBuffer = dstManager.AddBuffer<BufferComponent8>(entity);
        tempBuffer.Add(new BufferComponent8() { dataA = 1, dataB = 100 });
        tempBuffer.Add(new BufferComponent8() { dataA = 2, dataB = 101 });
        tempBuffer.Add(new BufferComponent8() { dataA = 3, dataB = 102 });
    }
}

3.在场景中管理组件

4.运行后看到多个相同组件挂到了同一个实体

5.查询组件值

using Unity.Collections;
using Unity.Entities;
using UnityEngine;
public class Test8 : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        EntityQuery tempEntityQuery = World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntityQuery(typeof(BufferComponent8));
        NativeArray<Entity> tempEntites1 = tempEntityQuery.ToEntityArray(Allocator.TempJob);
        DynamicBuffer<BufferComponent8> tempBuffer = World.DefaultGameObjectInjectionWorld.EntityManager.GetBuffer<BufferComponent8>(tempEntites1[0]);
        Debug.Log(tempBuffer[0].dataA);
        tempEntites1.Dispose();
    }
}

6.编译组件

foreach (var item in tempBuffer)
{
    Debug.Log(item.dataA);
}

7.插入组件

tempBuffer.Insert(0, new BufferComponent8() { dataA = 999, dataB = 878 });