Unity3D 5.4.1 获取2D Sprite切割后的图

1.导入一张PNG图集放置目录"Assets/Resources/UI/ball.png"下

2.将ball.png选中修改Texture Type为Sprite（2D and UI）,Sprite Mode改为Multiple，点击Apply按钮进行应用。

接着，点击Sprite Editor打开精灵编辑器，点击左上角的Slice按钮，弹出切片设置，再次点击里面的Slice按钮，就会自动对图片进行切割，点击右上角的Apply按钮，进行保存。会产生切割出来的小图片。

3.然后再选中ball.png,将图片纹理类型更改为Advanced，将"Read/Write Enabled"属性进行打勾。

4.在Assets新建一个目录Editor，在里面创建一个TestSaveSprite.cs脚本

using UnityEngine;
using UnityEditor;
using System.IO;
public class TestSaveSprite
{

    [MenuItem("Tools/导出Sprites")]
    static void SaveSprite()
    {
        string resourcesPath = "Assets/Resources/";
        foreach (Object obj in Selection.objects)
        {
            string selectionPath = AssetDatabase.GetAssetPath(obj);
            // 必须最上级是"Assets/Resources/"
            if (selectionPath.StartsWith(resourcesPath))
            {
                    string selectionExt = Path.GetExtension(selectionPath);
                    if (selectionExt.Length == 0)
                    {
                       continue;
                     }
                    // 从路径"Assets/Resources/UI/testUI.png"得到路径"UI/testUI"
                    string loadPath = selectionPath.Remove(selectionPath.Length - selectionExt.Length);
                    loadPath = loadPath.Substring(resourcesPath.Length);
                    // 加载此文件下的所有资源
                    Sprite []sprites = Resources.LoadAll<Sprite>(loadPath);
                    if (sprites.Length > 0)
                    {
                        // 创建导出文件夹
                        string outPath = Application.dataPath + "/outSprite/" + loadPath;
                        Directory.CreateDirectory(outPath);
                        foreach (Sprite sprite in sprites)
                        {
                                // 创建单独的纹理
                                Texture2D tex = new Texture2D((int)sprite.rect.width, (int)sprite.rect.height, sprite.texture.format, false);
                                tex.SetPixels(sprite.texture.GetPixels((int)sprite.rect.xMin, (int)sprite.rect.yMin,
                                (int)sprite.rect.width, (int)sprite.rect.height));
                                 tex.Apply();
                                   // 写入成PNG文件
                               File.WriteAllBytes(outPath + "/" + sprite.name + ".png", tex.EncodeToPNG());
                         }
                         Debug.Log("SaveSprite to " + outPath);
                    }
            }
        }
            Debug.Log("SaveSprite Finished");
     }
}

5.选中ball.png,点击菜单栏Tools/导出Sprites，即可生成单张图片