Unity3d c＃。 onClick.AddListener（）工作一次

Question

There's a void in the script, which reloads Canvas. The Canvas contains the Button object. I attach the reload void with the script.

using UnityEngine;
using UnityEngine.UI;

public class Trashscript : MonoBehaviour {

   public GameObject Temp;
   private GameObject Active;
   int Counter;

   void Start()
   {
       Menu();
   }

  void Menu()
   {
       Counter++;

       if (Active != null) Destroy(Active);
       Active = Instantiate(Temp);

       GameObject.Find("Text").GetComponent<Text>().text = Counter.ToString();
       GameObject.Find("Btn").GetComponent<Button>().onClick.AddListener(Menu);
   }
}

First call (from Start ) works fine the "Text" element shows "1". After clicking the "Btn" Canvas reloads, but there isn't any "Text", and "Btn" doesn't work (onClick event do nothing).

Help.

Answer 1

I can't tell what your code is doing but each time the Button is clicked, Menu function is called which leads to GetComponent<Button>().onClick.AddListener(Menu) being called again.

You have to move GetComponent<Button>().onClick.AddListener(Menu) out of the Munu function and into the Start() function. You also have to un-register to the Button event in the OnDisable() function.

Below is what your code should look like:

Button button;

void Start()
{
    button = GameObject.Find("Btn").GetComponent<Button>();
    button.onClick.AddListener(Menu);
}

void OnDisable()
{
    button.onClick.RemoveListener(Menu);
}

void Menu()
{
    ///Put Your Button click code here

}

Answer 2

我解决我的问题与改变GameObject.Find("")以Active.transform.Find("")