Why isn't this instantiation cast working?

Question

So i am trying to directly cast a instantiated object as my custom component ClickableTile.

 TileType tt = tileTypes[tiles[x, y]];
 var tile = Instantiate(tt.tileVisualPrefab, new Vector3(x, y, 0), Quaternion.identity) as ClickableTile;
 Debug.Log(tile);

This returns null.

ClickableTile.cs looks like this and are attached to the prefab:

 public class ClickableTile : MonoBehaviour
 {
     public int tileX;
     public int tileY;
     public TileMap map;
   
     void OnMouseUp()
     {
         Debug.Log("Click!");
 
         map.MoveSelectedUnitTo(tileX, tileY);
     }
 }

Why isnt this working? I thought that we could cast to any component on object?

This works:

 TileType tt = tileTypes[tiles[x, y]];
 GameObject tile = (GameObject)Instantiate(tt.tileVisualPrefab, new Vector3(x, y, 0), Quaternion.identity);
 ClickableTile ct = tile.GetComponent<ClickableTile>();

Something i am missing?

Answer 1

Best Answer

Answer by jgodfrey · May 21, 2016 at 03:24 PM

I assume your "ClickableTile" script has just been added (as a component) to a standard GameObject that you've turned into a prefab, right? if that's the case, the object you're instantiating isn't a "ClickableTile", it's a GameObject that has a ClickableTile component attached to it.

To get access to the ClickableTile script, you need to instantiate the prefab as a GameObject, and then get a reference to the ClickableTile component. So, something like this:

 GameObject tile = (GameObject)Instantiate(tt.tileVisualPrefab, new Vector3(x, y, 0), Quaternion.identity);
 var ct = tile.GetComponent<ClickableTile>();

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DanLevi · May 21, 2016 at 03:45 PM 0

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Yes that is the case. I was assuming i could just cast it to a ClickableTile, i am sure i saw something like this in a tutorial i watched earlier. Well, thanks, i guess that is cleared up.

Why isn't this instantiation cast working?

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