Sprite Editor 圖集切片精靈

切圖需求

假設有一張大的UI的圖集，咱們想把它裏面的小圖一張一張地切割出來，若是有plist文件，請查閱個人另外一篇文章《還原TexturePacker plist 文件 切開各小圖片》

今天咱們使用 Unity4.3或更高版本自帶的 Sprite Editor 來導出切片精靈

切圖效果

步驟

一、準備一張大的圖集，導入Unity的Asset/Resources/XXX/文件夾下(注意：圖集文件必定要放在Resources文件下)

二、該圖集默認是Texture，咱們須要把它的Type修改爲Sprite

三、接着修改Sprite Mode爲Multiple，應用。而後點擊 Sprite Editor

四、在打開的Sprite Edirot 窗口中把圖集切成多個Sprite

插件代碼

五、編寫TestExportSprite.cs，放在Editor目錄下

using UnityEngine;
using UnityEditor;

public class TestExportSprite
{
    
    [MenuItem("Assets/導出選中圖片爲單獨png")]
    static void ExportSelSprite()
    {
        string resourcesPath = "Assets/Resources/";
        foreach (Object obj in Selection.objects)
        {
            string selectionPath = AssetDatabase.GetAssetPath(obj);

            // 必須最上級是"Assets/Resources/"
            if (selectionPath.StartsWith(resourcesPath))
            {
                string selectionExt = System.IO.Path.GetExtension(selectionPath);
                if (selectionExt.Length == 0)
                {
                    continue;
                }

                // 獲得導出路徑
                string loadPath = selectionPath.Remove(selectionPath.Length - selectionExt.Length);
                loadPath = loadPath.Substring(resourcesPath.Length);

                // 加載此文件下的全部資源
                Sprite[] sprites = Resources.LoadAll<Sprite>(loadPath);
                if (sprites.Length > 0)
                {
                    // 建立導出文件夾
                    string outPath = Application.dataPath + "/outSprite/" + loadPath;
                    System.IO.Directory.CreateDirectory(outPath);

                    foreach (Sprite sprite in sprites)
                    {
                        // 建立單獨的紋理
                        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();

                        // 寫入成PNG文件
                        System.IO.File.WriteAllBytes(outPath + "/" + sprite.name + ".png", tex.EncodeToPNG());
                    }
                    Debug.Log(string.Format("Export {0} to {1}",loadPath,outPath));
                }
            }
        }
        Debug.Log("Export All Sprites Finished");
    }
}

五、使用Sprite Editor把圖集切割成Sprite以後，修改圖集的屬性爲Advanced，並勾選 Read/Write Enabled 和Transpare

不然當你導出切片時會報錯

UnityException: Texture 'UIAtlas' is not readable, the texture memory can not be accessed from scripts. You can make the texture readable in the Texture Import Settings.
UnityEngine.Texture2D.GetPixels (Int32 x, Int32 y, Int32 blockWidth, Int32 blockHeight) (at C:/BuildAgent/work/aeedb04a1292f85a/artifacts/EditorGenerated/TextureBindings.cs:259)
TestSaveSprite.SaveSprite () (at Assets/Editor/TestSaveSprite.cs:39)

五、在Resources目錄下選中UIAtlas.psd，右鍵，選擇「導出選中圖片爲單獨png

 

說明

部份內容參考自：http://blog.csdn.net/akof1314/article/details/38845933