PrefabUtility.CreateEmptyPrefab

Description

Creates an empty prefab at given path.

If a prefab at the path already exists it will be deleted and replaced with an empty prefab. Returns a reference to the prefab.

// Creates a prefab from the selected GameObjects.
// If the prefab already exists it asks if you want to replace it.
using UnityEngine;
using UnityEditor;

public class CreatePrefabExample : EditorWindow
{
    [MenuItem("Examples/October/CreatePrefabExample")]
    static void CreatePrefab()
    {
        GameObject[] objs = Selection.gameObjects;

        if (objs.Length == 0)
        {
            Debug.Log("No GameObjects selected.");
            return;
        }

        foreach (GameObject go in objs)
        {
            Debug.Log("foreach: " + go.name);
            string localPath = "Assets/October/" + go.name + ".prefab";
            if (AssetDatabase.LoadAssetAtPath(localPath, typeof(GameObject)))
            {
                Debug.Log("no idea, but something");
                if (EditorUtility.DisplayDialog("Are you sure?",
                        "The prefab already exists. Do you want to overwrite it?",
                        "Yes",
                        "No"))
                {
                    Debug.Log("DisplayDialog took yes");
                    CreateNew(go, localPath);
                }
            }
            else
            {
                Debug.Log(go.name + " is not a prefab, will convert");
                CreateNew(go, localPath);
            }
        }
    }

    static void CreateNew(GameObject obj, string localPath)
    {
        Debug.Log("CreateNew: " + obj.name + " : " + localPath);
        Object prefab = PrefabUtility.CreateEmptyPrefab(localPath);
        PrefabUtility.ReplacePrefab(obj, prefab, ReplacePrefabOptions.ConnectToPrefab);
    }
}