Button.onClick.AddListener

Questions & Answers
1

Hi everybody, im using this code:

public int index;
    private Button myselfButton;

    void Start()
    {
        myselfButton = GetComponent<Button>();
    }

	void Update () {
        if (Input.GetMouseButtonUp(0))
        {
            myselfButton.onClick.AddListener(() => actionToMaterial(index));
        }
	}

    void actionToMaterial(int idx)
    {
        Debug.Log("change material to HIT  on material :  " + idx);
    }

and when i click on the button, console write me some debug, in one time, but i need call this function only one. How can i do it? Anybody knows what im doing wrong?
Thanks

2

Just add the listener to your button in start only and not required to be done inside Update on each click.

 public int index;
 private Button myselfButton;

 void Start()
 {
     myselfButton = GetComponent<Button>();
     myselfButton.onClick.AddListener(() => actionToMaterial(index));
 }

 void actionToMaterial(int idx)
 {
     Debug.Log("change material to HIT  on material :  " + idx);
 }

You should also RemoveListener when gameobject is destroyed or disabled

 void Destroy()
 {
      myselfButton.onClick.RemoveListener(() => actionToMaterial(index));
 }