UnityUI:Canvas框架获取鼠标悬浮UI

将下面脚本挂在主体Canvas上，Canvas会对下面所有Image挂上PointerHandler脚本，并且可以通过GetPointEnter方法判断当前鼠标是否悬停在UI上

public class BaseCanvas : MonoBehaviour
{public static BaseCanvas Main;private void Awake(){Main = this;Init();}public Dictionary<GameObject, PointerHandler> pointerHandler = new Dictionary<GameObject, PointerHandler>();void Init(){List<Image> images = new List<Image>();GetChildComponect(transform, ref images);foreach (Image image in images){image.gameObject.AddComponent<PointerHandler>();image.Init();}}void GetChildComponect<T>(Transform t,ref List<T> list){if(t.GetComponent<T>() != null){list.Add(t.GetComponent<T>());}if (t.childCount > 0){for (int i = 0; i < t.childCount; i++){GetChildComponect<T>(t.GetChild(i), ref list);}}}public bool GetPointEnter(){foreach (var handler in pointerHandler){if (handler.Value.mouseIn){return true;}}return false;}
}

下面是PointerHandler脚本，其余脚本可以获取这个脚本并写入事件，这个脚本在触发点击或拖拽时会调用对应的事件

using System;
using UnityEngine;
using UnityEngine.EventSystems;public class PointerHandler : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler, IPointerDownHandler, IPointerUpHandler, IPointerClickHandler, IDragHandler
{public bool mouseIn;public Action<PointerHandler, PointerEventData> pointerEnter = (part, data) => { };public Action<PointerHandler, PointerEventData> pointerExit = (part, data) => { };public Action<PointerHandler, PointerEventData> pointerDown = (part, data) => { };public Action<PointerHandler, PointerEventData> pointerUp = (part, data) => { };public Action<PointerHandler, PointerEventData> pointerClick = (part, data) => { };public Action<PointerHandler, PointerEventData> pointerDrag = (part, data) => { };public void ResetAction(){pointerEnter = (part, data) => { };pointerExit = (part, data) => { };pointerDown = (part, data) => { };pointerUp = (part, data) => { };pointerClick = (part, data) => { };pointerDrag = (part, data) => { };}public void Init(){BaseCanvas.Main.baseUIEvents[gameObject] = this;}private void OnDestroy(){BaseCanvas.Main.baseUIEvents.Remove(gameObject);}private void OnDisable(){mouseIn = false;}public void OnPointerEnter(PointerEventData eventData){mouseIn = true;pointerEnter(this, eventData);}public void OnPointerExit(PointerEventData eventData){mouseIn = false;pointerExit(this, eventData);}public void OnPointerDown(PointerEventData eventData){pointerDown(this, eventData);}public void OnPointerUp(PointerEventData eventData){pointerUp(this, eventData);}public void OnPointerClick(PointerEventData eventData){pointerClick(this, eventData);}public void OnDrag(PointerEventData eventData){pointerDrag(this, eventData);}
}