GetComponent(); returning null

Question

So I'm trying to make an interface system for interactable items. Here's the interface:

 public interface IInteractable {

     // Can be interacted with
     public bool inter { get; set; }

     // Interact function
     public void Interact();
 }

I took this and implemented it in the following test script, which I attached to a GameObject with proper colliders.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Test_NPC : MonoBehaviour, IInteractable {
 
     public bool inter { get; set; }
 
     public void Interact() {
         Debug.Log("Interact");
     }
 }

Then I took a 2D Box collider and connected it to the player and attached the following script to it:

 private void OnTriggerEnter2D(Collider2D other) { 
     var interactable = other.gameObject.GetComponent<IInteractable>();
     interactable.Interact();
 }

It didn't work, so I went in with a breakpoint, and- alas- interactable was returning null. other.gameObject was properly returning the NPC GameObject.

I've been struggling with this for the past few days, so I've been progressively simplifying the functions to no avail. Any help is greatly appreciated!

Answer 1

Best Answer

Answer by Fireye04 · 12 hours ago

I don't know how or why, but renaming the interactable variable in the box collider script to interable fixed everything. Then I took the Test_NPC script and modified it a bit:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
  
 public class Test_NPC : MonoBehaviour, IInteractable {
  
    private bool _inter;

    public bool inter { get { return _inter; } set { _inter = value; } }
 
     public void Interact() {
         Debug.Log("Interact");
     }

     void Awake() {
         _inter = true;
     }

 }

And the code worked perfectly. Hopefully this helps anyone stumbling across this in the future.

Add comment · Show 1 · Share

Bunny83 · 2 hours ago 0

Share

I doubt this would help anyone as your changes can not have any effect on the behaviour of GetComponent. I've seen in your screenshot where you showed the "components" array, your line of execution is on your getcomponents line. That means it has not been executed yet. So at this point "interactable" would still be null.

Maybe you originally had an issue where you did not save some of your changes in VS (for example the "IInteractable" was missing on the "Test_NPC" class?)

local variable names have no meaning to the compiler as local variable names are not remembered at all. local variables just have an offset from the current stackframe once compiled. Also scope clashes can't be the issue either as local scope always beats higher scopes.

GetComponent(); returning null

1 Reply

Your answer

Follow this Question

Related Questions