Unity 2D和3D对象的点击

1.2D对象响应点击

（1）Canvas对象上有Graphic Raycaster

（2）被点击的对象加上Image,并勾选Raycast Target

（3）场景里有唯一对象挂上EventSystem和StandaloneInputModule

（4）被点击的对象加上Button, 然后调用:

        GetComponent<Button>().onClick.AddListener(() =>{Debug.Log("button click");});

2.3D对象响应点击

（1）看3d对象的camera上挂上Physics Raycaster

（2）被点击对象上加上Box Collider

（3）场景里有唯一对象挂上EventSystem和StandaloneInputModule

（4）挂上点击脚本，内容如下：

public class SceneObjClick : EventTrigger {public override void OnPointerClick(PointerEventData eventData){base.OnPointerClick(eventData);Debug.Log("Scene Obj Click");}public override void OnDrag(PointerEventData eventData){base.OnDrag(eventData);Debug.Log("Scene Obj Drag");}
}

其中EventTrigger.cs是unity自身的脚本，内如如下：

namespace UnityEngine.EventSystems
{//// 摘要://     /////     Receives events from the EventSystem and calls registered functions for each//     event.//     ///[AddComponentMenu("Event/Event Trigger")]public class EventTrigger : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler, IPointerDownHandler, IPointerUpHandler, IPointerClickHandler, IInitializePotentialDragHandler, IBeginDragHandler, IDragHandler, IEndDragHandler, IDropHandler, IScrollHandler, IUpdateSelectedHandler, ISelectHandler, IDeselectHandler, IMoveHandler, ISubmitHandler, ICancelHandler, IEventSystemHandler{//// 摘要://     /////     All the functions registered in this EventTrigger (deprecated).//     ///[Obsolete("Please use triggers instead (UnityUpgradable) -> triggers", true)]public List<Entry> delegates;protected EventTrigger();//// 摘要://     /////     All the functions registered in this EventTrigger.//     ///public List<Entry> triggers { get; set; }//// 摘要://     /////     Called before a drag is started.//     /////// 参数://   eventData://     Current event data.public virtual void OnBeginDrag(PointerEventData eventData);//// 摘要://     /////     Called by the EventSystem when a Cancel event occurs.//     /////// 参数://   eventData://     Current event data.public virtual void OnCancel(BaseEventData eventData);//// 摘要://     /////     Called by the EventSystem when a new object is being selected.//     /////// 参数://   eventData://     Current event data.public virtual void OnDeselect(BaseEventData eventData);//// 摘要://     /////     Called by the EventSystem every time the pointer is moved during dragging.//     /////// 参数://   eventData://     Current event data.public virtual void OnDrag(PointerEventData eventData);//// 摘要://     /////     Called by the EventSystem when an object accepts a drop.//     /////// 参数://   eventData://     Current event data.public virtual void OnDrop(PointerEventData eventData);//// 摘要://     /////     Called by the EventSystem once dragging ends.//     /////// 参数://   eventData://     Current event data.public virtual void OnEndDrag(PointerEventData eventData);//// 摘要://     /////     Called by the EventSystem when a drag has been found, but before it is valid//     to begin the drag.//     /////// 参数://   eventData://     Current event data.public virtual void OnInitializePotentialDrag(PointerEventData eventData);//// 摘要://     /////     Called by the EventSystem when a Move event occurs.//     /////// 参数://   eventData://     Current event data.public virtual void OnMove(AxisEventData eventData);//// 摘要://     /////     Called by the EventSystem when a Click event occurs.//     /////// 参数://   eventData://     Current event data.public virtual void OnPointerClick(PointerEventData eventData);//// 摘要://     /////     Called by the EventSystem when a PointerDown event occurs.//     /////// 参数://   eventData://     Current event data.public virtual void OnPointerDown(PointerEventData eventData);//// 摘要://     /////     Called by the EventSystem when the pointer enters the object associated with//     this EventTrigger.//     /////// 参数://   eventData://     Current event data.public virtual void OnPointerEnter(PointerEventData eventData);//// 摘要://     /////     Called by the EventSystem when the pointer exits the object associated with this//     EventTrigger.//     /////// 参数://   eventData://     Current event data.public virtual void OnPointerExit(PointerEventData eventData);//// 摘要://     /////     Called by the EventSystem when a PointerUp event occurs.//     /////// 参数://   eventData://     Current event data.public virtual void OnPointerUp(PointerEventData eventData);//// 摘要://     /////     Called by the EventSystem when a Scroll event occurs.//     /////// 参数://   eventData://     Current event data.public virtual void OnScroll(PointerEventData eventData);//// 摘要://     /////     Called by the EventSystem when a Select event occurs.//     /////// 参数://   eventData://     Current event data.public virtual void OnSelect(BaseEventData eventData);//// 摘要://     /////     Called by the EventSystem when a Submit event occurs.//     /////// 参数://   eventData://     Current event data.public virtual void OnSubmit(BaseEventData eventData);//// 摘要://     /////     Called by the EventSystem when the object associated with this EventTrigger is//     updated.//     /////// 参数://   eventData://     Current event data.public virtual void OnUpdateSelected(BaseEventData eventData);//// 摘要://     /////     An Entry in the EventSystem delegates list.//     ///public class Entry{//// 摘要://     /////     The desired TriggerEvent to be Invoked.//     ///public TriggerEvent callback;//// 摘要://     /////     What type of event is the associated callback listening for.//     ///public EventTriggerType eventID;public Entry();}//// 摘要://     /////     UnityEvent class for Triggers.//     ///public class TriggerEvent : UnityEvent<BaseEventData>{public TriggerEvent();}}
}

3.点击原理

底层调用Physics.RaycastAll，从摄像机发出一条射线，拿到所有碰撞到的物体，进行排序，获取第一个碰撞物体，然后获取该物体上得事件函数，进行调用。事件函数有EventTrigger继承的那些接口。

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Unity 2D和3D对象的点击

1.2D对象响应点击

2.3D对象响应点击

3.点击原理

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