How to use transform.Find()?

Unity Engine
1

Hello,
I have a question:
I wrote this code:

        objectParent = transform.Find("objectName");
          if(objectParent != null)
               {
               if(PlayerPrefs.GetInt(gameObject.name) == 0)
               {
                   objectParent.gameObject.SetActive(true);
               }
               else
               {
                   objectParent.gameObject.SetActive(false);
               }
        }

The object objectName is a child of the object with the script, but every time when I run the script I get this error:
NullReferenceException: Object reference not set to an instance of an object.
Can anyone help pleas? I have no idea wehre the mistake is…
Thank you!

2

I would avoid the use of transform.Find altogether. It’s fragile and prone to typos.

Why not just have a variable like:

[SerializeField]
Transform myChild;

And simply assign the reference in the inspector?

2 Likes
3

Thank you, but what is the different between

Transform objectName;

and

[Serializefield]
Transform objectName;

?

4

https://docs.unity3d.com/ScriptReference/SerializeField.html

It shows up in the inspector so you can drag and drop a game object (in this case its transform component) into it.
Please always read the documentation, it explains most things.

5

Isn’t that the same like public?

6

Nope. Other scripts won’t see this property. Which is the purpose of private access.

7

Ok. Thanks

8

Juhu! Everything works perfect! Thanks for all of your help!

1 Like