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Question by unity_uYmRyWZxVlsMeg · Dec 31, 2020 at 12:36 PM · ai

The variable has not been assigned

Hello guys, can you help me. I am newbie in unity. I tried to create oncollisionenter. I tried to do thing that when the object collide with another object, it will appear the UI Image but when I put the UI image to the variable box, it shows that the variable has not been assigned etc. Below are my coding.

 void OnCollisionEnter(Collision other)
 {
     if (other.gameObject.tag == "Player")
     {
         Time.timeScale = 0f;
         delay = 5f;
         Question.SetActive(true);
     }
 }

}

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avatar image sacredgeometry · Jan 01, 2021 at 07:11 PM 0
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It shows what variable as not being assigned?

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Answer by prakyathd801 · Dec 31, 2020 at 01:05 PM

SetActive Doesn't work for UI elements ! Try this code: Note:Don't forget to include Using UnityEngine.UI;

 public Image Questions;
 void OnCollisionEnter(Collision other)
  {
      if (other.gameObject.tag == "Player")
      {
          Time.timeScale = 0f;
          delay = 5f;
          Questions.enabled = true;
      }
  }

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avatar image unity_uYmRyWZxVlsMeg · Jan 01, 2021 at 05:51 PM 0
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Thanks @prakyathd801 , but when I changed the coding as you told, it shows Object reference not set to an instance of an object. Am I missing something here? Hope you can help me

 void OnCollisionEnter(Collision other)
 {
     if (other.gameObject.tag == "Player")
     {
         Time.timeScale = 0f;
         delay = 5f;
         Questions.enabled = true;
     }
 }

}

avatar image Llama_w_2Ls unity_uYmRyWZxVlsMeg · Jan 01, 2021 at 05:58 PM 0
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You need to drag in the UI Image into the slot that should appear in the script in the inspector. If there isn't a slot, you need to have public Image Questions; above the OnCollisionEnter method.

avatar image unity_uYmRyWZxVlsMeg Llama_w_2Ls · Jan 01, 2021 at 06:40 PM 0
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I've done it, below are my full script

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.Scene$$anonymous$$anagement; using UnityEngine.UI;

public class Questionctrl : $$anonymous$$onoBehaviour { public Image Questions; public float delay;

 void OnCollisionEnter(Collision other)
 {
     if (other.gameObject.tag == "Player")
     {
         Time.timeScale = 0f;
         delay = 5f;
         Questions.enabled = true;
     }
 }

}

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avatar image trannel · Jan 02, 2021 at 08:58 PM 1
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(just a note) SetActive does not work on any component. it only works on gameobjects. and every component has a gameobject reference. so SetActive works on UI element(.gameObject)

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