Unity3D - 设计模式 - 工厂模式

工厂模式：以食物生产为例

1. 一个生产食物的工厂（此项 需要建立两个类：食物基类<Food>，工厂类<Factory>）

2. 可以生产不同的食物（此项 建立食物的具体子类，均继承食物的基类）

3. 运行程序生成不同的食物（此项 建立程序运行的主类 继承鱼MonoBehaviour，创建工厂类变量、食物基类变量，然后再Start方法里给食物基类变量赋值<通过传入参数的不同 将父类指向一个子类>）

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

/// <summary>
/// 测试工厂模式
/// </summary>

// 创建实物的基类
public class Food
{
    public virtual void ShowMe ()
    {
        Debug.Log ("这是实物基类");
    }
}
// 西红柿类
public class TomatoFood:Food
{
    public override void ShowMe ()
    {
        // 掉父类方法
        base.ShowMe ();

        Debug.Log ("TomatoFood");
    }
}
// 鸡蛋
public class EggFood:Food
{
    public override void ShowMe ()
    {
        base.ShowMe ();

        Debug.Log ("EggFood");
    }
}

public class Factory
{
    public Food MakeFood (string name)
    {
        if (name == "egg") {
            return new EggFood ();
        } else if (name == "tomato") {
            return new TomatoFood ();
        }
        return null;
    }
}

public class Main : MonoBehaviour
{
    Factory factory = new Factory ();
    Food food1;
    Food food2;

    public void Start ()
    {
        food1 = factory.MakeFood ("egg");
        food1.ShowMe ();

        food2 = factory.MakeFood ("tomato");
        food2.ShowMe ();
    }
}

以Resources加载游戏物体为例

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

public class SpriteFactory : MonoBehaviour
{
    public Object[] allSprit;
    private int allIndex = ;
    private Transform canvasTransform;

    /// <summary>
    /// 加载 Resources 文件夹下的资源
    /// </summary>
    void Start ()
    {
        canvasTransform = GameObject.Find ("Canvas").transform;
        LoadSprite ("Number");
    }

    void Update ()
    {
        if (Input.GetKeyDown (KeyCode.A)) {
            allIndex++;
            GameObject tempObj = GetImage (allIndex);
            tempObj.transform.parent = canvasTransform;
            tempObj.transform.position = new Vector3 (allIndex * , , );
        }
    }

    /// <summary>
    /// 加载Resources文件夹下指定名称的资源
    /// </summary>
    /// <param name="name">指定名称</param>
    public void LoadSprite (string name)
    {
        allSprit = Resources.LoadAll (name);
    }

    /// <summary>
    /// 加载指定索引的资源，并把该资源显示出来
    /// </summary>
    /// <returns>返回一个新生成的物体，该物体显式刚刚加载的资源</returns>
    /// <param name="index">给出要加载资源的一个索引</param>
    public GameObject GetImage (int index)
    {
        GameObject tempObj = new GameObject ("tempObj");
        Image tempImage = tempObj.AddComponent<Image> ();
        tempImage.sprite = allSprit [index] as Sprite;
        return tempObj;
    }
}