Project/Assets/Scripts/SceneRoot/Editor/SetSpriteInChildren.cs

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using UnityEngine;
using UnityEditor;
using System.Collections;
using System.IO;

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//
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namespace ReaderRabbit
{
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    public class SpriteChildren : EditorWindow
	{
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		[MenuItem ("RR1ST Animation/Set sprite in children (for [Character]_Animator child objects)")]
		static void WindowSetSpriteInChildren()
		{
            SpriteChildren window = (SpriteChildren)EditorWindow.GetWindow(typeof(SpriteChildren));
		}

        string m_ParentFolderName = "";
		string m_FolderName = "";

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		void OnGUI()
		{
			EditorGUILayout.LabelField("1. Select the child of [Character]_Animator (e.g. Characters->Reader->Reader_Animator->Blink).", EditorStyles.label);
			EditorGUILayout.LabelField("2. Set the folder name containing all the children frames in the text field below (e.g. 10055).", EditorStyles.label);

            m_ParentFolderName = EditorGUILayout.TextField("Parent folder name (leave blank for default)", m_ParentFolderName);
            m_FolderName = EditorGUILayout.TextField("Folder name", m_FolderName);

			EditorGUILayout.LabelField("3. Hit the button below.", EditorStyles.label);

			if (GUILayout.Button("Set Sprite In Children"))
                SetChildren();
		}
			
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		//
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		void SetChildren()
		{
            // Get scene name, based on scene.unity filename.
            string sceneName = "";

            if (string.IsNullOrEmpty(m_ParentFolderName))
            {
                sceneName = System.IO.Path.GetFileName(EditorApplication.currentScene);
                sceneName = sceneName.Substring(0, sceneName.Length - ".unity".Length);
            }
            else
            {
                sceneName = m_ParentFolderName;
            }

            Transform parent = Selection.activeTransform;
            string oldName = "";
            SpriteRenderer spriteRenderer = null;
            int index = 0;
                
            foreach (Transform child in parent.transform)
            {
                // Rename children with prefix and add _N at the end.
                oldName = child.name;
                child.name = m_FolderName + "_" + index;
                KishiTechUnity.KishiTechDebug.KTDebug.Instance().Log("Renamed child \'" + oldName + "\' to \'" + child.name + "\'");

                // Associate the prefix_N.png sprite filename to the object's SpriteRenderer.
                spriteRenderer = child.GetComponent<SpriteRenderer>();
                spriteRenderer.sprite = AssetDatabase.LoadAssetAtPath("Assets/Sprites/" + sceneName + "/" + m_FolderName + "/" + m_FolderName + "_" + index + ".png", typeof(Sprite)) as Sprite;

                ++index;
            }

			ShowNotification(new GUIContent("Done."));
		}

    } // public class SpriteChildren : EditorWindow

} // namespace KishiTechUnity