Maybe this is a bug ...

Hi all, Hi dev team,

Working on my project, and trying to access via script to a UI.Text child of a UI.RectTransform ... NullReference ... This is a realy simple RectTransform with a Button component with another RectTransform as child with a Text component.

BUT !

Code (csharp):

1.  
2. // Return null :
3. buttonRectTransform.GetComponentInChildren<Text>() as Text;
4.  
5. // Return my Text object :
6. buttonRectTransform.GetChild(0).GetComponent<Text>() as Text;
7. // linkedBuyTransform.GetChild(0).GetComponent<Text>() as Text; (Before edit)
8.  

Is it a bug ? Maybe I'm wrong ...

 

Try removing the casts. I don't think those are necessary and it could be causing issues.

 

does buttonRectTransform have children?
Your example wouldve been more convincing if you had used the same reference each time

 

Ya I had the same thought too, but gave him the benefit of the doubt, haha.

 

The casts aren't necessary but will never cause issues. If you get a null reference exception, that means the object you're attempting to reference doesn't exist. It's not a Unity bug.

--Eric

 

My bad ...

This is exactly the same object (those two lines are really side by side, no modifications between them) :

Code (csharp):

1.  
2. // Return null :
3. buttonRectTransform.GetComponentInChildren<Text>() as Text;
4.  
5. // Return my Text object :
6. buttonRectTransform.GetChild(0).GetComponent<Text>() as Text;
7.  

(linkedBuyTransform is my script var name, renamed to buttonRectTransform for the forum, just missed one replace)

And the scructure is really simple as I've said :

RectTransform with a Button
+- RectTransform with a Text

And yes, the cast is useless, but I've tried with it ... just in case.

 

Stopped being lazy, tested for myself:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using UnityEngine.UI;
4.  
5. public class NewBehaviourScript : MonoBehaviour {
6.     public Transform otherTransform;
7.  
8.     void Start () {
9.         Debug.Log( otherTransform.GetComponentInChildren<Text>() );
10.         Debug.Log( otherTransform.GetChild( 0 ).GetComponent<Text>() );
11.     }
12. }
13.  

No errors (Unity 4.6.2f1)

 

In the general case as casts can cause null reference errors, because as will return null if the casting is impossible. However in this case the casting will not cause the error, just burn through cpu cycles.

 

Hey, thank you hpjon, exactly what I mean, but you've got the right result ><

Do not understand why ... I'll try to find out why ...

Thank you !