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Question by andypan · Feb 26, 2017 at 09:21 AM · uibuttonbutton trigger events

Change multiple button interactable fields

My program has a lot of buttons (over 300) and their interactable states all vary (some are enabled, some are disabled). I'm trying to write a script that will enable every single button by setting objects tagged ButtonTag1 interactable to True. I'm using the event system on a button to enable the public void "EnableButton" which should enable every single button, but when I run the function I get this error:

NullReferenceException: Object reference not set to an instance of an object ButtonEnable.EnableButton () (at Assets/_Scripts/ButtonEnable.cs:16)

And here is the script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class ButtonEnable : MonoBehaviour {
     public GameObject[] objs;
 
     void Start() {
         objs = GameObject.FindGameObjectsWithTag("ButtonTag1");
         }
 
     public void EnableButton() {
         objs = GameObject.FindGameObjectsWithTag("ButtonTag1");
         foreach (Object ButtonTag1 in objs) {
             GetComponent<Button>().interactable = true;
             }
         }
     }
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Answer by andypan · Feb 26, 2017 at 11:53 AM

This problem has been solved so I'll share the solution in case anyone comes across a similar situation.

I replaced

  foreach (Object ButtonTag1 in objs) {
              GetComponent<Button>().interactable = true;
              }

with

  foreach (GameObject ButtonTag1 in objs) {
             ButtonTag1.GetComponent<Button>().interactable = true;
             }


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