change texture of GuiButton in for loop

Question

Hello,

I´m very new to programing and started to learn c# a couple of weeks ago. I want to create a Tic Tac Toe game in Unity. So my first goal is to create a functional 3x3 board.

I use a 2d array and nested for loops to create the board. Now I´m trying to find a way, how to change the texture of one button when clicked. I´ve set up an array of textures, so I can use the indexes for each texture (X,O and blank).

So, my problem is.. Because the Buttons are drawn in the for loop, when I change the index via mouseclick, every Button gets the same texture. I need a way to assign the texture after the for loop. Can you help me with this?

Thanks,

Manuel

 using UnityEngine;
 using System.Collections;
 
 public class buttons : MonoBehaviour {
     
 //Variables////////////////////////////////////////////////////////
 //
     
     public GUISkin customSkin;
     
     public Texture2D[] buttonTex;
     
     int playerX =     1;
     int playerO =     2;
     int blank    =      0;
 
     
     int turn = -1;
     int state = 0;
     
     public int x;
     public int y;
     
 
 
     
 //Game Board///////////////////////////////////////////////////////////////////////////////////
     //
     
     void OnGUI (){
         
     //Custom Skin
         //
         
     GUI.skin = customSkin;
         
         
 
         // Draw 3x3 Board
         //
         
 
         
     int index = 0;
         
     int [,] board = new int [3,3];
         
     for (y = 0; y < 3; y++)
     {
     for (x = 0; x < 3; x++)
         {
             if (GUI.Button (new Rect (x *100,y *100, 100, 100), new GUIContent (buttonTex[state + 1])))
                     
             {
                 
                 transform.localScale = new Vector3(0.1F, 0, 0);
                 state = turn;
                 turn = turn * -1;
                 
                 
             }    
         }
 
     }            
         
 }

Answer 1

You need to keep track of the state of each button individually. Here are a few changes to your code. I'm not sure if this is what you were going to use board[,] for.

 using UnityEngine;
 using System.Collections;
  
 public class buttons : MonoBehaviour {
  
 //Variables////////////////////////////////////////////////////////
 //
     public GUISkin customSkin;
  
     public Texture2D[] buttonTex;
  
     int playerX =  1;
     int playerO =  2;
     int blank  =    0;
  
  
     int turn = -1;
     int state = 0;
  
     public int x;
     public int y;
     
     private int [,] board = new int [3,3] {{0,0,0},{0,0,0},{0,0,0}};
  
 //Game Board///////////////////////////////////////////////////////////////////////////////////
     //
  
     void OnGUI (){
  
     //Custom Skin
        //
  
     GUI.skin = customSkin;
  
        // Draw 3x3 Board
        //
  
     int index = 0;
 
     for (y = 0; y < 3; y++)
     {
     for (x = 0; x < 3; x++)
        {
          if (GUI.Button (new Rect (x *100,y *100, 100, 100), new GUIContent (buttonTex[board[y,x]])))
  
          {
           //transform.localScale = new Vector3(0.1F, 0, 0);
           //state = turn;
           //turn = turn * -1;
             board[y,x] = (board[y,x] + 1) % 3;
          }    
        }
  
     }       
 }
     
 }

change texture of GuiButton in for loop

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