效果

事件

事件在Canvas的GraphicRaycaster组件启用时生效

1、2 的事件

• Assets/Scripts/Event_01_02.cs

  using UnityEngine;
  using UnityEngine.UI;
  
  public class Event_01_02 : MonoBehaviour
  {
      public Image EventUI01;
  
      public Button EventUI02;
  
      private void Awake()
      {
          // EventUI01
          UGUIEventListener.Get(EventUI01.gameObject).OnClick = (go, eventData) => { Debug.Log($"{go.name}"); };
  
          // EventUI02
          EventUI02.onClick.AddListener(delegate { Debug.Log(EventUI02.name); });
      }
  }
  

• Assets/Scripts/UGUIEventListener.cs

  using UnityEngine;
  using UnityEngine.Events;
  using UnityEngine.EventSystems;
  
  public class UGUIEventListener : EventTrigger
  {
      public UnityAction<GameObject, PointerEventData> OnClick;
  
      public override void OnPointerClick(PointerEventData eventData)
      {
          base.OnPointerClick(eventData);
          OnClick?.Invoke(gameObject, eventData);
      }
  
      public static UGUIEventListener Get(GameObject go)
      {
          return go.GetComponent<UGUIEventListener>() == null
              ? go.AddComponent<UGUIEventListener>()
              : go.GetComponent<UGUIEventListener>();
      }
  }
  

3 的事件

• Assets/Scripts/Event_03.cs

  using UnityEngine;
  using UnityEngine.EventSystems;
  
  public class Event_03 : MonoBehaviour, IPointerClickHandler
  {
      public void OnPointerClick(PointerEventData eventData)
      {
          Debug.Log($"{gameObject.name}");
      }
  }
  

4 的事件（渗透事件）

• Assets/Scripts/Event_04.cs

  using System.Collections.Generic;
  using System.Linq;
  using UnityEngine;
  using UnityEngine.EventSystems;
  
  public class Event_04 : MonoBehaviour, IPointerClickHandler
  {
      // 监听点击
      public void OnPointerClick(PointerEventData eventData)
      {
          Debug.Log($"★{gameObject.name}");
          PassEvent(eventData, ExecuteEvents.pointerClickHandler);
      }
  
      // 事件渗透
      private void PassEvent<T>(PointerEventData eventData, ExecuteEvents.EventFunction<T> function)
          where T : IEventSystemHandler
      {
          // 存储当前点击位置的射线投射结果
          List<RaycastResult> results = new List<RaycastResult>();
          EventSystem.current.RaycastAll(eventData, results);
          foreach (var result in results.Where(result => gameObject != result.gameObject))
          {
              ExecuteEvents.Execute(result.gameObject, eventData, function);
              // break; // RaycastAll后UGUI会自己排序，如果你只想响应透下去的最近的一个响应，这里ExecuteEvents.Execute后直接break就行。
          }
      }
  }
  

键盘事件

• Assets/Scripts/KeyboardEvent.cs

  using UnityEngine;
  using UnityEngine.Events;
  
  public class KeyboardEvent : MonoBehaviour
  {
      private UnityAction<int, string> _uAction;
      private readonly UnityEvent<int, string> _uEvent = new UnityEvent<int, string>();
  
      private void Start()
      {
          _uAction = (num, str) => { Debug.Log($"{num} ---> {str}"); };
  
          _uEvent.AddListener(_uAction);
      }
  
      private void Update()
      {
          if (Input.GetKeyDown(KeyCode.A))
              _uAction.Invoke(0, "Lee");
          if (Input.GetKeyDown(KeyCode.B))
              _uEvent.Invoke(1, "AaA");
      }
  }