プレハブの一括操作・保存用エディタ拡張ウィンドウ

PrefabEditEditorWindow.cs

using System.IO;
using UnityEditor;
using UnityEngine;
using UnityEngine.UI;

namespace Editor
{
    public class PrefabEditEditorWindow : EditorWindow
    {
        private DefaultAsset targetFolder;
        private string targetFilePath;
        private Sprite convertSprite;

        [MenuItem("PrefabEdit/プレハブ変換")]
        private static void OpenWindow()
        {
            var window = GetWindow<PrefabEditEditorWindow>("プレハブ変換");
            window.Show();
        }

        private void OnGUI()
        {
            var currentTargetFolder = (DefaultAsset)EditorGUILayout.ObjectField("対象フォルダ", targetFolder, typeof(DefaultAsset), false);

            if (currentTargetFolder != null)
            {
                targetFolder = currentTargetFolder;
                targetFilePath = AssetDatabase.GetAssetOrScenePath(targetFolder);
            }

            var currentConvertSprite = (Sprite)EditorGUILayout.ObjectField("置換用画像", convertSprite, typeof(Sprite), false);

            if (currentConvertSprite != null)
            {
                convertSprite = currentConvertSprite;
            }

            if (GUILayout.Button("Convert"))
            {
                ConvertAssets();
            }
        }

        private void ConvertAssets()
        {
            Debug.Log("Start Convert Assets");

            if (string.IsNullOrEmpty(targetFilePath))
            {
                return;
            }

            var assetGuids = AssetDatabase.FindAssets("t:prefab", new[] { targetFilePath });

            foreach (var assetGuid in assetGuids)
            {
                var path = AssetDatabase.GUIDToAssetPath(assetGuid);
                Debug.Log($"EditAssetPath: {path}");

                EditAsset(path);
            }

            AssetDatabase.SaveAssets();
        }

        private void EditAsset(string path)
        {
            // 画像変更処理
            var prefabObject = PrefabUtility.LoadPrefabContents(path);
            prefabObject.GetComponent<Image>().sprite = convertSprite;
            PrefabUtility.UnloadPrefabContents(prefabObject);

            // リネーム処理
            var nameOld = Path.GetFileNameWithoutExtension(path);
            var nameNew = $"{nameOld}_edit";
            AssetDatabase.RenameAsset(path, nameNew);
        }
    }
}