Initialization of prefabs

Question

Hey, i have an issue with understanding the way that prefabs are initialized. I have two scripts, one which initializes prefabs in a for loop, and the second one is attached to each prefab and is being executed in Start method. Is it normal that the second script is being executed after the whole for loop has been executed? For example:

  // First script Update method
   private void Update() {
  for (var i = 0.5f; i < 3; i++) {
         Debug.Log('Loop' + i);
         PrefabUtility.InstantiatePrefab(tilePrefab as GameObject) as GameObject;
     } 
 }

 //Second script start method
 private void Start() {
      Debug.Log('Prefab start');
 }

Will give me output:

 Loop 0,5 
 Loop 1,5
 Loop 2,5
 Prefab start
 Prefab start
 Prefab start

instead of expected:

 Loop 0,5
 Prefab start
 Loop 1,5
 Prefab start
 Loop 2,5
 Prefab start

Is it supposed to work like that?

Answer 1

Answer by Bunny83 · May 06, 2018 at 12:53 AM

Start is called right before the first Update would be called on the object. Since you do the instantiate inside Update of your other script, Start of the instantiated objects will be called the next frame. You may want to use the Awake method. Awake is called before the Instantiate method returns. However it's only called when the prefab is active.

However your code looks really strange. The PrefabUtility is an editor class which can only be used in the editor. It's meant to be used at edit time only. At edit time no Start or Awake methods will be called (unless you have added the ExecuteInEditMode attribute to your script). What is this script supposed to do? where should it be used?

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Initialization of prefabs

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