Unity Event Sample

UnityEventSample.cs

using System;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class UnityEventSample : Graphic, IPointerUpHandler, IPointerDownHandler
{
    [Serializable]
    public class EventNone : UnityEvent
    {
    }

    [Serializable]
    public class EventBool : UnityEvent<string>
    {
    }

    public EventNone EventNoneInstance = new EventNone();

    public EventBool EventBoolInstance = new EventBool();

    protected override void Awake()
    {
        base.Awake();
        EventNoneInstance.AddListener(() => { Debug.Log("None"); });
        EventBoolInstance.AddListener((str) => { Debug.Log(str); });
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        EventNoneInstance.Invoke();
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        EventBoolInstance.Invoke("Bool");
    }
}