How to get an array of all Buttons attached to a Panel?

Question

Given a Panel with some number of Buttons, I'd like to have a script on that Panel that can manipulate each Button in the panel, one-by-one, in a particular way. Unfortunately, I'm having big trouble with the very first step: getting an array of Buttons.

The scripting manual says that Button is descended from MonoBehavior, which suggests you ought to be able to treat a Button as a component. So I tried this:

 Button[] buttons = this.GetComponents<Button>();
 Debug.Log ("buttons.length = " + buttons.Length);

but the log then tells me that buttons.Length = 0;

The object heirarchy suggests that Buttons are GameObjects, as they have a transform, and can both be children and have children. So I tried this:

         int j=0;
         Button[] buttons = new Button[6];
         foreach(Transform child in transform)
         {
             if(child.gameObject is Button)
             {
                 buttons[j] = (Button) child.gameObject;
                 j++;
             }
             GameObject go = child.gameObject;
         }

but it fails to compile. Unity warns me that the expression (child.gameObject is Button) can never evaluate to true, and that the cast (Button) child.gameObject is illegal.

Any advice? Within a script attached to a Panel, how can you get an array of all Buttons that are children of that Panel?

Answer 1

Best Answer

Answer by tauseef_xavi · Jul 11, 2015 at 06:47 AM

 Button[] buttons = this.GetComponentsInChildren<Button>();

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Cherno · Jul 11, 2015 at 08:57 AM 1

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I'd also use the optional parameter that includes inactive components:

 Button[] buttons = this.GetComponentsInChildren<Button>(true);

TimBur · Jul 14, 2015 at 12:48 AM 0

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Both great answers.

In hindsight, I see how that makes sense: $$anonymous$$y Buttons are component-type objects, and they are also children of the Panel. Thanks.

Answer 2

Hi,

Follow the tutorial

https://www.youtube.com/watch?v=r1ALQCwR1Bs

Along with that,

Create a button to the panel in which size has to be displayed.

1.create a script attach it to the panel. 2.create a public gameobject and assign the button to it.

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 using UnityEngine.Events;
 using UnityEngine.EventSystems;
 
 public class Create_Button : MonoBehaviour
 {
 
     public GameObject Base;
     
     GameObject[] Buttons=new GameObject[20];
 
         int count=18;
     
     void Start () 
     {
        cartdet ();
     }
     void cartdet () 
     {
           Buttons=new GameObject[count];
 
        Buttons[i]=Instantiate(Base, new Vector3(0f,0f,0.0f),           Quaternion.identity) as GameObject;
             Buttons[i].transform.SetParent (this.transform);
 
             Buttons[i].GetComponent<RectTransform>().localScale=new Vector3 (1f,1f,1f);
 
             Buttons[i].name="Button"+i.ToString();
         }
 }

The output of the above script will looks like

How to get an array of all Buttons attached to a Panel?

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