Array of buttons not displaying in game

Question

I am trying to take an array of images and display them in buttons. Depending on the size of the array, it is suppose to create a button per image. The problem is that when i try to run the code I get this error:

NullReferenceException: Object reference not set to an instance of an object Boo.Lang.Runtime.RuntimeServices.InvokeBinaryOperator (System.String operatorName, System.Object lhs, System.Object rhs) NewBehaviourScript.DrawButtons () (at Assets/NewBehaviourScript.js:13) NewBehaviourScript.Update () (at Assets/NewBehaviourScript.js:8)

My question is what am I doing wrong? this is the code:

  var numberOfButtonsWide = 6;
    var topLeft = Vector2(100,100);
    var width = 800;
    var buttonHeight = 60;
  var myList : Texture[];
 
   function Start(){
   DrawButtons();
   }
    function DrawButtons()
    {
      var buttonWidth = width/numberOfButtonsWide;
       for(var x =0; x < myList.Count; x++)
  
       {
            if(GUI.Button(
                 Rect(topLeft.x + (x % numberOfButtonsWide) * buttonWidth, 
                        topLeft.y + Mathf.FloorToInt(x / numberOfButtonsWide) * buttonHeight,buttonWidth,buttonHeight),
                  GUIContent (myList[x])))
            {
           
            }
       }
    }

Answer 1

Best Answer

Answer by zharik86 · Dec 13, 2014 at 08:18 AM

GUI method use only into OnGUI() function. And use Texture2D instead of Texture:

  function Start(){
  
  }

  function OnGUI(){
   DrawButtons();
  }

I hope that it will help you.

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darkcookie · Dec 13, 2014 at 08:26 AM 0

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still does not work I get the same error even if I call it from the OnGUI(){} is looks like the error is coming from the for loop, but I dont know why.

zharik86 · Dec 13, 2014 at 10:19 AM 0

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@darkcookie Of course, you get error. Your variable "myList" declare as Array, but in loop "for" you use it as List. Try:

  function DrawButtons() {
   var buttonWidth = width/numberOfButtonsWide;
   //Not use Count, use Length
   for(var x:int = 0; x < myList.Length; x++) {
    if(GUI.Button(
     Rect(topLeft.x + (x % numberOfButtonsWide) * buttonWidth, 
     topLeft.y + Mathf.FloorToInt(x / numberOfButtonsWide) * buttonHeight,buttonWidth,buttonHeight),
     GUIContent(myList[x])))
     {
        
     }
   }
  }

darkcookie · Dec 22, 2014 at 07:21 AM 0

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OK that worked thank you !

Array of buttons not displaying in game

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