UGUI鼠标事件绑定+鼠标长按

本文主要是介绍UGUI鼠标事件绑定+鼠标长按，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

unity中鼠标事件的监听方式有很多，一般主要使用的是继承EventTrigger实现

EventTrigger中给我们提供了17种触发事件，这里不一一赘述，其中在游戏里经常使用的点击长按则没有。

比如在商店中购买，在背包中出售，技能加点，点击同一按钮时需要对按钮进行长按处理，来快速增加或减少。在unity 的ngui中有onpressed回调可以使用，但是在ugui中没有这种功能，就需要自己添加。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;public class UGUIEventListener : EventTrigger
{public delegate void VoidDelegate(GameObject go);public VoidDelegate onClick;public VoidDelegate onDown;public VoidDelegate onEnter;public VoidDelegate onExit;public VoidDelegate onUp;public VoidDelegate onSelect;public VoidDelegate onUpdateSelect;public VoidDelegate onLongPress;                    //长按按键public float interval = 1f;                         //长按按键判断间隔public float invokeInterval = 0.2f;                 //长按状态方法调用间隔private bool isPointDown = false;private float lastInvokeTime;                       //鼠标点击下的时间private float timer;static public UGUIEventListener Get(GameObject go){UGUIEventListener listener = go.GetComponent<UGUIEventListener>();if (listener == null) listener = go.AddComponent<UGUIEventListener>();return listener;}public override void OnPointerClick(PointerEventData eventData){if (onClick != null) onClick(gameObject);}public override void OnPointerDown(PointerEventData eventData){isPointDown = true;lastInvokeTime = Time.time;if (onDown != null) onDown(gameObject);}public override void OnPointerEnter(PointerEventData eventData){if (onEnter != null) onEnter(gameObject);}public override void OnPointerExit(PointerEventData eventData){isPointDown = false;                            //鼠标移出按钮时推出长按状态if (onExit != null) onExit(gameObject);}public override void OnPointerUp(PointerEventData eventData){isPointDown = false;if (onUp != null) onUp(gameObject);}public override void OnSelect(BaseEventData eventData){if (onSelect != null) onSelect(gameObject);}public override void OnUpdateSelected(BaseEventData eventData){if (onUpdateSelect != null) onUpdateSelect(gameObject);}private void Update(){if (isPointDown){if (Time.time-lastInvokeTime>interval){timer += Time.deltaTime;if (timer>invokeInterval){onLongPress.Invoke(gameObject);timer = 0;}}}}
}

使用方法如下：

using UnityEngine;public class Test : MonoBehaviour
{private GameObject image;// Use this for initializationprivate void Awake(){image = GameTool.FindTheChild(gameObject,"Image").gameObject;UGUIEventListener.Get(image).onLongPress = test; }public void test(GameObject go){Debug.Log("123");}}

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