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Question by CommanderKei · Mar 15, 2015 at 07:07 PM · uibuttonsubtracting

Subtracting random numbers instead of 1

I'm a beginner when it comes to scripting, and I've run into this weird problem.

What I'm trying to do is that when you click a button, the amount of wood goes down by 1, but instead of subtracting just 1 it subtracts (appearently) random numbers like -43 and so on. Please take a look at my code and tell me why this is?

 public int wood;

 public Text woodText;
 public Button stokeButton;

 void Start () {

     wood = 10;
 }
 
 void Update () {

     woodText.text = "Wood: " + wood;

     stokeButton.onClick.AddListener(() => {
         //handle click here
         wood -= 1;
     });
 }
 

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Answer by tanoshimi · Mar 15, 2015 at 07:10 PM

You're adding an additional onclick listener every time the Update() loop runs, and every single one subtracts another -1 from wood. Add the listener once, in Start():

 void Start () {
   wood = 10;
   stokeButton.onClick.AddListener(() => {
     wood -= 1;
   });
 }

 void Update () {
   woodText.text = "Wood: " + wood;
 }

 
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