AddRemovePersistentListener.cs

AddRemovePersistentListener.cs

using UnityEngine.UI;
using UnityEditor.Events;
using UnityEngine.Events;
public class AddRemovePersistentListener : MonoBehaviour
{
  /*
  Just a basic use case for removing and adding listeners on runtime.
  Sometimes it's pretty handy.
  It may be expensive for dealing with a bunch of buttons and listeners. Use at your own risk.
  K.S.A. 29.11.17
  github.com/ksnnacar
  */
  public SomeScript someScript;
  public Button someButton;
	void Start () 
  {

        UnityAction<int> intAction = (x) => { someScript.intMethod(x); };
        int a = someButton.onClick.GetPersistentEventCount();
        //Iterate over existing event listeners;
        for (int i = 0; i < a; i++)
        {
        UnityEventTools.RemovePersistentListener(someButton.onClick, 0);
        }

        UnityEventTools.AddIntPersistentListener(someButton.onClick, intAction, 1);
	}
	
	
}