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xianyi
321
Assets/TcgEngine/Scripts/Tools/SpriteLoader.cs
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321
Assets/TcgEngine/Scripts/Tools/SpriteLoader.cs
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using System;
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using System.Collections.Generic;
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using System.IO;
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using UnityEngine;
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namespace TcgEngine
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{
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/// <summary>
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/// 动态Sprite加载器，支持从本地下载的资源中加载图片
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/// </summary>
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public class SpriteLoader : MonoBehaviour
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{
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private static SpriteLoader instance;
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private Dictionary<string, Sprite> spriteCache = new Dictionary<string, Sprite>();
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private Dictionary<string, Texture2D> textureCache = new Dictionary<string, Texture2D>();
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public static SpriteLoader Instance
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{
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get
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{
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if (instance == null)
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{
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GameObject go = new GameObject("SpriteLoader");
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instance = go.AddComponent<SpriteLoader>();
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DontDestroyOnLoad(go);
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}
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return instance;
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}
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}
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private void Awake()
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{
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if (instance == null)
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{
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instance = this;
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DontDestroyOnLoad(gameObject);
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}
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else if (instance != this)
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{
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Destroy(gameObject);
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}
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}
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/// <summary>
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/// 从本地文件加载Sprite
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/// </summary>
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/// <param name="relativePath">相对于Sprites文件夹的路径</param>
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/// <returns>加载的Sprite，失败返回null</returns>
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public Sprite LoadSprite(string relativePath)
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{
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if (string.IsNullOrEmpty(relativePath))
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{
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Debug.LogWarning("[SpriteLoader] Empty relativePath provided");
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return null;
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}
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Debug.Log($"[SpriteLoader] Loading sprite: {relativePath}");
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// 检查缓存
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if (spriteCache.ContainsKey(relativePath))
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{
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Debug.Log($"[SpriteLoader] Found in cache: {relativePath}");
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return spriteCache[relativePath];
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}
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try
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{
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// 先尝试从下载的本地资源加载
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string localPath = GetLocalSpritePath(relativePath);
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Debug.Log($"[SpriteLoader] Checking local path: {localPath}");
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if (File.Exists(localPath))
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{
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Debug.Log($"[SpriteLoader] Local file exists, loading from: {localPath}");
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Sprite sprite = LoadSpriteFromFile(localPath);
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if (sprite != null)
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{
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Debug.Log($"[SpriteLoader] Successfully loaded from local file: {relativePath}");
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spriteCache[relativePath] = sprite;
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return sprite;
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}
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else
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{
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Debug.LogWarning($"[SpriteLoader] Failed to load sprite from local file: {localPath}");
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}
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}
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else
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{
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Debug.LogWarning($"[SpriteLoader] Local file does not exist: {localPath}");
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}
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// 如果本地文件不存在，尝试从Resources加载（fallback）
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Debug.Log($"[SpriteLoader] Trying Resources fallback for: {relativePath}");
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Sprite fallbackSprite = LoadSpriteFromResources(relativePath);
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if (fallbackSprite != null)
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{
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Debug.Log($"[SpriteLoader] Successfully loaded from Resources: {relativePath}");
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spriteCache[relativePath] = fallbackSprite;
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return fallbackSprite;
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}
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Debug.LogWarning($"[SpriteLoader] Failed to load sprite from both local and Resources: {relativePath}");
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return null;
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}
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catch (Exception e)
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{
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Debug.LogError($"[SpriteLoader] Error loading sprite {relativePath}: {e.Message}");
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return null;
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}
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}
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/// <summary>
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/// 从文件系统加载Sprite
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/// </summary>
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private Sprite LoadSpriteFromFile(string filePath)
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{
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try
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{
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// 加载纹理
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Texture2D texture = LoadTextureFromFile(filePath);
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if (texture == null)
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return null;
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// 创建Sprite
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Sprite sprite = Sprite.Create(
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texture,
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new Rect(0, 0, texture.width, texture.height),
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new Vector2(0.5f, 0.5f)
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);
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return sprite;
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}
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catch (Exception e)
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{
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Debug.LogError($"Error loading sprite from file {filePath}: {e.Message}");
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return null;
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}
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}
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/// <summary>
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/// 从文件加载纹理
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/// </summary>
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private Texture2D LoadTextureFromFile(string filePath)
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{
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if (textureCache.ContainsKey(filePath))
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{
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return textureCache[filePath];
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}
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try
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{
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byte[] fileData = File.ReadAllBytes(filePath);
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Texture2D texture = new Texture2D(2, 2);
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if (texture.LoadImage(fileData))
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{
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textureCache[filePath] = texture;
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return texture;
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}
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else
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{
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Destroy(texture);
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return null;
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}
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}
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catch (Exception e)
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{
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Debug.LogError($"Error loading texture from file {filePath}: {e.Message}");
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return null;
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}
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}
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/// <summary>
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/// 从Resources文件夹加载Sprite（fallback）
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/// </summary>
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private Sprite LoadSpriteFromResources(string relativePath)
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{
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try
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{
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// 移除文件扩展名
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string resourcePath = Path.ChangeExtension(relativePath, null);
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// 尝试直接加载Sprite
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Sprite sprite = Resources.Load<Sprite>(resourcePath);
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if (sprite != null)
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return sprite;
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// 如果直接加载失败，尝试加载Texture2D然后转换
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Texture2D texture = Resources.Load<Texture2D>(resourcePath);
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if (texture != null)
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{
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return Sprite.Create(
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texture,
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new Rect(0, 0, texture.width, texture.height),
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new Vector2(0.5f, 0.5f)
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);
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}
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return null;
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}
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catch (Exception e)
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{
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Debug.LogError($"Error loading sprite from resources {relativePath}: {e.Message}");
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return null;
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}
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}
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/// <summary>
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/// 获取本地Sprite文件路径
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/// </summary>
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private string GetLocalSpritePath(string relativePath)
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{
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if (ResourceDownloader.Get() != null)
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{
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return ResourceDownloader.Get().GetLocalSpritePath(relativePath);
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}
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// Fallback路径
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string basePath = Path.Combine(Application.persistentDataPath, "Sprites");
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return Path.Combine(basePath, relativePath);
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}
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/// <summary>
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/// 清理缓存
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/// </summary>
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public void ClearCache()
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{
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foreach (var sprite in spriteCache.Values)
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{
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if (sprite != null)
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Destroy(sprite);
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}
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spriteCache.Clear();
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foreach (var texture in textureCache.Values)
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{
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if (texture != null)
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Destroy(texture);
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}
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textureCache.Clear();
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}
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/// <summary>
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/// 预加载指定目录下的所有图片
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/// </summary>
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public void PreloadSprites(string directory)
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{
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try
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{
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string localDir = GetLocalSpritePath(directory);
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if (!Directory.Exists(localDir))
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return;
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string[] files = Directory.GetFiles(localDir, "*.png", SearchOption.AllDirectories);
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foreach (string file in files)
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{
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string relativePath = GetRelativePath(file);
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LoadSprite(relativePath);
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}
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}
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catch (Exception e)
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{
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Debug.LogError($"Error preloading sprites from {directory}: {e.Message}");
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}
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}
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/// <summary>
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/// 获取相对路径
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/// </summary>
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private string GetRelativePath(string fullPath)
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{
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string spritesPath = GetLocalSpritePath("");
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if (fullPath.StartsWith(spritesPath))
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{
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return fullPath.Substring(spritesPath.Length + 1);
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}
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return fullPath;
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}
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/// <summary>
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/// 检查Sprite是否存在
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/// </summary>
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public bool SpriteExists(string relativePath)
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{
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if (spriteCache.ContainsKey(relativePath))
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return true;
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string localPath = GetLocalSpritePath(relativePath);
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if (File.Exists(localPath))
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return true;
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// 检查Resources
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string resourcePath = Path.ChangeExtension(relativePath, null);
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Sprite sprite = Resources.Load<Sprite>(resourcePath);
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if (sprite != null)
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{
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Resources.UnloadAsset(sprite);
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return true;
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}
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Texture2D texture = Resources.Load<Texture2D>(resourcePath);
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if (texture != null)
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{
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Resources.UnloadAsset(texture);
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return true;
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}
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return false;
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}
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private void OnDestroy()
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{
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ClearCache();
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}
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public static SpriteLoader Get()
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{
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return Instance;
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}
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}
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}
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