Unity背包

🤔

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• 背包是大多类型游戏的必要功能之一，也是游戏设计中比较重要的一个元素。
• 这里是一个简单的背包代码演示，不多介绍背包的具体设计及用户体验。

该背包使用ugui搭建，结构如下图

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添加背包物品类
AddEquip.cs

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

public class AddEquip : MonoBehaviour {

    public GameObject equipPrefab;
    Transform kanpsack;
    public GameObject itemPrefab;
    void Awake()
    {
        kanpsack = GameObject.Find("Knapsack").transform;
    }
	void Start () {
		Sprite[] allSprs = Resources.LoadAll<Sprite> ("");
        //循环添加物品
		for (int i = 0; i < allSprs.Length; i++)
        {
            //Sprite sp = Resources.Load<Sprite>(i.ToString());
            GameObject g = Instantiate<GameObject>(equipPrefab, transform);
			g.GetComponent<Image>().sprite = allSprs[i];
			int indx = i;
			g.GetComponent<Button>().onClick.AddListener(delegate() { AddEquips(allSprs[indx]); } );
        }
	}

    //物品选择
    void AddEquips(Sprite sp)
    {
        for (int i = 0; i < kanpsack.childCount; i++)
        {
            Transform cell = kanpsack.GetChild(i);
            //上面有物品,
            if (cell.childCount > 0)
            {
                //判断所选的物品是否重复,重复就数量++
                if (cell.GetChild(0).GetComponent<Image>().sprite.name == sp.name)
                {
                    Text text = cell.GetChild(0).GetComponentInChildren<Text>();
                    if(text.text == ""){
                        text.text = "1";
                    }
                    int count = int.Parse(text.text);
                    count++;
                    text.text = count.ToString();
                    return;
                }
            }
        }

        //到了这步说明，所选的物品之前没有选取过
        for (int i = 0; i < kanpsack.childCount; i++)
        {
            Transform cell = kanpsack.GetChild(i);
            if (cell.childCount ==0)
            {
                GameObject go = Instantiate<GameObject>(itemPrefab, cell);
                go.transform.localPosition = Vector3.zero;
                go.GetComponent<Image>().sprite = sp;
                go.transform.GetChild(0).gameObject.SetActive(true);
                return;
            }
        }
    }
}

背包物品移动类
ChangeEquipScript.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
//强制添加组件
[RequireComponent(typeof(CanvasGroup))]
public class ChangeEquipScript : MonoBehaviour,IBeginDragHandler,IEndDragHandler,IDragHandler {
     Transform canvas;//Canvas
    private Transform originalParent;//拖拽物品的原父物体
    private CanvasGroup canvasGroup;
    Vector3 dis;//鼠标位置到拖拽物品的距离
    void Awake()
    {
        canvas = GameObject.Find("Canvas").transform;
    }
    void Start()
    {
        canvasGroup = GetComponent<CanvasGroup>();
    }
    //开始拖拽
    public void OnBeginDrag(PointerEventData eventData)
    {
        originalParent = transform.parent;
        //使拖拽的物品位于其它UI之上
        transform.SetParent(canvas);
        dis = transform.position - Input.mousePosition;
        //不阻止射线透过当前拖拽的物品，检测下方的UI
        canvasGroup.blocksRaycasts = false;
    }
    
    //拖拽中
    public void OnDrag(PointerEventData eventData)
    {
        transform.position = Input.mousePosition + dis;
    }

    //结束拖拽
    public void OnEndDrag(PointerEventData eventData)
    {

        //获取鼠标进入的游戏物体
        Transform obj;
         
        //判断鼠标是否进入UI外
        if (eventData.pointerEnter == null)
        {
            transform.SetParent(originalParent);
            transform.localPosition = Vector3.zero;
            canvasGroup.blocksRaycasts = true;
            return;
        }
        else
        {
            obj = eventData.pointerEnter.transform;
        }
        switch (obj.tag)
        {
            case "item":
                {
                    //交换两个游戏物品
                    Transform t = obj.parent;
                    obj.SetParent(originalParent);

                    transform.SetParent(t);
                    obj.localPosition = Vector3.zero;
                }
                break;
            case "cell":
                {
                    //判断Cell上是否有物品
                    if (obj.childCount == 1)
                    {
                        //有装备
                        Transform child = obj.GetChild(0);
                        child.SetParent(originalParent);
                        transform.SetParent(obj);
                        child.localPosition = Vector3.zero;
                    }
                    else
                    {
                        //无装备
                        //直接将拖拽的物品放置在cell上
                        transform.SetParent(obj);
                    }
                }
                break;
            default:
                {
                    //移除范围后，重置
                    transform.SetParent(originalParent);
                }
                break;
        }
        
        transform.localPosition = Vector3.zero;
        canvasGroup.blocksRaycasts = true;
    }  
}