Add event trigger to button via script C#

Questions & Answers
1

i want a way to attach an event trigger to a button that i just instantiated with script and make it call functions from a specific object if pressed . how do i do that ? when i instantiate for some reason the object from which it should take the functions from is null so that’s why i wanna reasign it with script

2

Well you can add a lambda or delegate but you should be able to use GameObject.Find to find the GameObject and access its components.

I just instantiated a button and when clicked got it to change the color of a panel called TargetPanel.

This was on the prefab button and uses the prefab OnClick to call IveBeenClicked:

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class InstButClick : MonoBehaviour {

	private RectTransform myPanel;
	// Use this for initialization
	void Start () {
		myPanel = GameObject.Find("TargetPanel").GetComponent<RectTransform>();
	}
	
	public void IveBeenClicked()
	{
		myPanel.GetComponent<Image>().color = Color.red;
	}
}

And this instantiates the ButtonPrefab:

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class InstButton : MonoBehaviour {

	public GameObject prefabButton;
	public RectTransform ParentPanel;

	// Use this for initialization
	void Start () {
		GameObject goButton = (GameObject)Instantiate(prefabButton);
		goButton.transform.SetParent(ParentPanel, false);
		goButton.transform.localScale = new Vector3(1, 1, 1);
	}

}

When I click it the panel changes color. Basic I know but it appears to work, is your setup different in some way?