How do I find a GameObject by a script attached to it?

Question

I'm currently using FindGameObjectsWithTag(""). I'm trying to use FindObjectsOfType<>() to the same thing with a script attached to it instead of a tag (since no multiple tags).

 public List<GameObject> isObject;
     GameObject go;
 
     void Start () {
 //isObject.AddRange(GameObject.FindGameObjectsWithTag("Player"));
         // Trying to find an object by component
         go = GameObject.FindObjectsOfType<IsObject>();
         isObject.AddRange(go);
 
         isObject.Clear();
     }

I get the errors

Assets/Scripts/IsObject.cs(15,21): error CS1503: Argument #1' cannot convert >UnityEngine.GameObject' expression to type >`System.Collections.Generic.IEnumerable'

and

Assets/Scripts/IsObject.cs(15,21): error CS1503: Argument #1' cannot convert >UnityEngine.GameObject' expression to type >`System.Collections.Generic.IEnumerable'

Answer 1

Best Answer

Answer by Bunny83 · Jun 17, 2018 at 01:45 PM

You don't need to find anything. Every component instance already knows which gameobject it belongs to. You can access the owning GameObject by using the gameObject property of your component.

 void Start ()
 {
     IsObject[] components = GameObject.FindObjectsOfType<IsObject>();
     foreach(IsObject comp in components)
         isObject.Add(comp.gameObject);
  }

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Lost_Syndicate · Jun 17, 2018 at 04:16 PM 0

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I wouldnt recommend using FindObjectsOfType in your final game.

Answer 2

To follow up, can I add a condition to that?

I only need objects that are above me (the object that is found). For example I have 5 objects lined up vertically

 o(1) has 0 objects above it
 o(2) has 1 object above it
 o(3) has 2 objects above it
 o(4) has 3 objects above it
 o(5) has 4 objects above it

I also want to keep doing this (not just at the start). Since I'm not applying forces I should place this in FixedUpdate List isObject; IsObject[] listOfObjects; SpriteRenderer sr;

 void FixedUpdate () {
         listOfObjects = GameObject.FindObjectsOfType<IsObject> ();
         sr = GetComponent<SpriteRenderer> ();
     }
 void FixedUpdate () {    
         foreach(IsObject foundObject in listOfObjects){
             if (foundObject.transform.position.y > transform.position.y){
                 isObject.Add (foundObject.gameObject);
                 sr.sortingOrder = isObject.Count;
             }
         }
 
         isObject.Clear();
     }

When I moved to fixedupdate i get the error

NullReferenceException: Object reference not set to an instance of an object IsObject.FixedUpdate () (at Assets/Scripts/IsObject.cs:36)

How do I find a GameObject by a script attached to it?

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