unity 单击、双击、三击

花了点时间对UI的点击逻辑进行了封装，双击时能够不触发单击事件（注意不能挂在空物体上，空物体无法响应事件），直接上代码

using System;
using System.Collections;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.Serialization;

namespace UnityEngine.UI
{
    public class Click : MonoBehaviour,IPointerClickHandler
    {
        [Serializable]
        public class ClickedEvent : UnityEvent
        {
            int actionCount = 0;
            public int ActionCount { get { return actionCount + GetPersistentEventCount(); } }
            public new void AddListener(UnityAction call)
            {
                actionCount++;
                base.AddListener(call);
            }
            public new void RemoveListener(UnityAction call)
            {
                actionCount--;
                base.RemoveListener(call);
            }

        }
        /// <summary>
        /// 判断单击双击的时间间隔
        /// </summary>
        public float interval = 0.5f;
        public Action a;
        [SerializeField]
        private ClickedEvent onSingleClick = new ClickedEvent();
        public ClickedEvent OnSingleClick { get { return onSingleClick; } }
        [SerializeField]
        private ClickedEvent onDoubleClick = new ClickedEvent();
        public ClickedEvent OnDoubleClick { get { return onDoubleClick; } }
        [SerializeField]
        private ClickedEvent onTripleClick = new ClickedEvent();
        public ClickedEvent OnTripleClick { get { return onTripleClick; } }

        bool isClicked = false;
        int clickCount = 0;

        public void OnPointerClick(PointerEventData eventData)
        {
            clickCount++;
            if (!isClicked)
            {
                isClicked = true;
                StartCoroutine(OnClickFinish());
            }
        }


        private IEnumerator OnClickFinish()
        {
            bool isSingleClickEnable = OnSingleClick != null && OnSingleClick.ActionCount > 0;
            bool isDoubleClickEnable = OnDoubleClick != null && OnDoubleClick.ActionCount > 0;
            bool isTripleClickEnable = OnTripleClick != null && OnTripleClick.ActionCount > 0;
            if (isDoubleClickEnable)
            {
                yield return new WaitForSeconds(interval);
            }
            if (isTripleClickEnable)
            {
                yield return new WaitForSeconds(interval);
            }
            if (clickCount <= 1)
            {
                if (isSingleClickEnable)
                {
                    OnSingleClick.Invoke();
                }
            }
            else if (clickCount == 2)
            {
                if (isDoubleClickEnable)
                {
                    OnDoubleClick.Invoke();
                }
                else if (isSingleClickEnable)
                {
                    OnSingleClick.Invoke();
                }
            }
            else
            {
                if (isTripleClickEnable)
                {
                    OnTripleClick.Invoke();
                }
                else if (isDoubleClickEnable)
                {
                    OnDoubleClick.Invoke();
                }
                else if (isSingleClickEnable)
                {
                    OnSingleClick.Invoke();
                }
            }
            clickCount = 0;
            isClicked = false;
        }
    }
}

　　

调用也比较简单，可以直接在面板上添加事件，也可以通过代码添加

using UnityEngine;

public class Test : MonoBehaviour
{
    public UnityEngine.UI.Click click;
    private void Start()
    {
        click.OnSingleClick.AddListener(()=> { Debug.LogError("OnSingleClick"); });
        click.OnDoubleClick.AddListener(()=> { Debug.LogError("OnDoubleClick"); });
        click.OnTripleClick.AddListener(()=> { Debug.LogError("OnTripleClick"); });
    }
}

　　

拖拽等更多的交互可以用UnityEngine.EventSystems.EventTrigger类，unity已经给封装好了，EventTrigger包含的回调

public virtual void OnPointerEnter(PointerEventData eventData)
public virtual void OnPointerExit(PointerEventData eventData)
public virtual void OnDrag(PointerEventData eventData)
public virtual void OnDrop(PointerEventData eventData)
public virtual void OnPointerDown(PointerEventData eventData)
public virtual void OnPointerUp(PointerEventData eventData)
public virtual void OnPointerClick(PointerEventData eventData)
public virtual void OnSelect(BaseEventData eventData)
public virtual void OnDeselect(BaseEventData eventData)
public virtual void OnScroll(PointerEventData eventData)
public virtual void OnMove(AxisEventData eventData)
public virtual void OnUpdateSelected(BaseEventData eventData)
public virtual void OnInitializePotentialDrag(PointerEventData eventData)
public virtual void OnBeginDrag(PointerEventData eventData)
public virtual void OnEndDrag(PointerEventData eventData)
public virtual void OnSubmit(BaseEventData eventData)
public virtual void OnCancel(BaseEventData eventData)