Unity 图集中加载图片_unity 加载图集

using System.Collections.Generic;
using UnityEngine;
using UnityEngine.U2D;

public class SpriteAtlasUtility : MonoBehaviour
{
    public static SpriteAtlasUtility Instance;
    private Dictionary<string , Sprite> spriteDic;
    private Dictionary<string , SpriteAtlas> atlasDic;
    private void Awake() {
        Instance = this;
        spriteDic = new Dictionary<string , Sprite>();
        atlasDic = new Dictionary<string , SpriteAtlas>();
    }

    public Sprite GetAtlasSprite(string atlasName,string spriteName) {
        if (spriteDic.TryGetValue(spriteName,out Sprite sprite)) {
            return sprite;
        }
        sprite = GetSpriteAtlas(atlasName)?.GetSprite(spriteName);
        spriteDic [spriteName] = sprite;
        return sprite;
    }
    public Sprite GetAtlasSprite(string spriteName) {
        if (spriteDic.TryGetValue(spriteName,out Sprite sprite)) {
            return sprite;
        }
        return sprite;
    }

    private SpriteAtlas GetSpriteAtlas(string atlasName) {
        SpriteAtlas atlas;
        if (!atlasDic.ContainsKey(atlasName)) {
            //TODO:AB或者Resources加载图集
            atlas = null;
        }
        else {
            atlas = atlasDic [atlasName];
        }
        return atlas;
    }
}

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