[UnityUI]UGUI按鈕長按效果

參考連接：http://blog.csdn.net/huutu/article/details/46448313

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

public class RepeatButton : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerExitHandler {

    public bool invokeOnce = false;//是否只調用一次
    private bool hadInvoke = false;//是否已經調用過

    public float interval = 0.1f;//按下後超過這個時間則認定爲"長按"
    private bool isPointerDown = false;
    private float recordTime;

    public UnityEvent onPress = new UnityEvent();//按住時調用
    public UnityEvent onRelease = new UnityEvent();//鬆開時調用

	void Start () 
    {
	
	}
	
	void Update () 
    {
        if (invokeOnce && hadInvoke) return;
        if (isPointerDown)
        {
            if ((Time.time - recordTime) > interval)
            {
                onPress.Invoke();
                hadInvoke = true;
            }
        }
	}

    public void OnPointerDown(PointerEventData eventData)
    {
        isPointerDown = true;
        recordTime = Time.time;
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        isPointerDown = false;
        hadInvoke = false;
        onRelease.Invoke();
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        isPointerDown = false;
        hadInvoke = false;
        onRelease.Invoke();
    }
}

能夠經過面板拖拽或者代碼來進行事件的綁定：

buttonL.GetComponent<RepeatButton>().onPress.AddListener(MoveLeft);
        buttonL.GetComponent<RepeatButton>().onRelease.AddListener(Stand);