ModelProject/Assets/Scripts/Reference.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// 引用计数类
/// </summary>
public class Reference 
{
    private List<Object> _requires;
    public int refCount;

    public virtual void AddReferance()
    {
        refCount++;
    }
    public virtual void Release()
    {
        refCount--;
    }

    /// <summary>
    /// 引用
    /// </summary>
    /// <param name="obj"></param>
    public void Require(Object obj)
    {
        if(_requires == null)
        {
            _requires = new List<Object>();
            _requires.Add(obj);
            AddReferance();
        }
    }
    /// <summary>
    /// 取消引用
    /// </summary>
    /// <param name="obj"></param>
    public void Dequire(Object obj)
    {
        if (_requires == null)
            return;
        if (_requires.Remove(obj))
            Release();
    }

    public bool IsUnused()
    {
        if(_requires != null)
        {
            for (var i = 0; i < _requires.Count; i++)
            {
                var item = _requires[i];
                if (item != null)
                    continue;
                Release();
                _requires.RemoveAt(i);
                i--;
            }
            if (_requires.Count == 0)
                _requires = null;            
        }
        return refCount <= 0;
    }
}