概述参考请看 参考博客

1、装饰模式原型

装饰模式原型UML

装饰模式原型代码

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

public class DecorateMode : MonoBehaviour
{
    private void Start () {

        ICoffee coffee1 = new LightCoffee();
        Debug.Log("咖啡容量：" + coffee1.Capacity() + "咖啡价格：" + coffee1.Cost());

        coffee1 = coffee1.AddDecorate(new MilkDecorate());
        Debug.Log("添加牛奶后咖啡容量：" + coffee1.Capacity() + "咖啡价格：" + coffee1.Cost());

        coffee1 = coffee1.AddDecorate(new PearlDecorate());
        Debug.Log("添加珍珠后咖啡容量：" + coffee1.Capacity() + "咖啡价格：" + coffee1.Cost());
    }
}

/// <summary>
/// 咖啡
/// </summary>
public abstract class ICoffee
{
    //咖啡的容量和消费
    public abstract double Capacity();
    public abstract double Cost();

    /// <summary>
    /// 给咖啡添加调料，会改变咖啡
    /// </summary>
    public ICoffee AddDecorate(DecorateCoffee decorate)
    {
        decorate.Coffee = this;
        return decorate;
    }
}
//淡咖啡和浓咖啡
public class LightCoffee : ICoffee
{
    public override double Capacity()
    {
        return 100;
    }

    public override double Cost()
    {
        return 20;
    }
}
public class StrongCoffee : ICoffee
{
    public override double Capacity()
    {
        return 150;
    }

    public override double Cost()
    {
        return 15;
    }
}

/// <summary>
/// 装饰咖啡类
/// </summary>
public class DecorateCoffee : ICoffee
{
    /// <summary>
    /// 要装饰的咖啡对象
    /// </summary>
    protected ICoffee mCoffee;
    public ICoffee Coffee { set { mCoffee = value; } }

    public override double Capacity()
    {
        return mCoffee.Capacity();
    }

    public override double Cost()
    {
        return mCoffee.Cost();
    }
}

/// <summary>
/// 添加牛奶。容量+20，价格+3。
/// </summary>
public class MilkDecorate : DecorateCoffee
{
    public override double Capacity()
    {
        return mCoffee.Capacity() + 20;
    }

    public override double Cost()
    {
        return mCoffee.Cost() + 3;
    }
}
/// <summary>
/// 添加珍珠。容量+10，价格+2。
/// </summary>
public class PearlDecorate : DecorateCoffee
{
    public override double Capacity()
    {
        return mCoffee.Capacity() + 10;
    }

    public override double Cost()
    {
        return mCoffee.Cost() + 2;
    }
}

结果

2、装饰模式优缺点

优点

1. 扩展性高，灵活性强。

缺点

1. 类的数量较多。
2. 某些情况下可能产生装饰过多的异常。

Unity---游戏设计模式（17）之装饰模式

原文：https://www.cnblogs.com/Fflyqaq/p/11742270.html