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Unity UGUI 動態新增Button.OnClick()事件

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.Events;
using UnityEngine.UI;


public class ButtonOnClickTest: MonoBehaviour {

	// Use this for initialization
	void Start () {
		List<string> btnsName = new List<string>();
		btnsName.Add("BtnPlay");
		btnsName.Add("BtnShop");
		btnsName.Add("BtnLeaderboards");

		foreach(string btnName in btnsName)
		{
			GameObject btnObj = GameObject.Find(btnName);
			Button btn = btnObj.GetComponent<Button>();
			btn.onClick.AddListener(delegate() {
				this.OnClick(btnObj); 
			});
		} 
	}

	public void OnClick(GameObject sender)
	{
		switch (sender.name)
		{
		case "BtnPlay":
			Debug.Log("BtnPlay");
			break;
		case "BtnShop":
			Debug.Log("BtnShop");
			break;
		case "BtnLeaderboards":
			Debug.Log("BtnLeaderboards");
			break;
		default:
			Debug.Log("none");
			break;
		}
	}
	
	// Update is called once per frame
	void Update () {
	
	}
}