Unity EventSystems 响应点击和拖拽(继承MonoBehaviour或者UIBehaviour)

最新推荐文章于 2025-10-18 18:24:24 发布

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本文介绍了如何在Unity中实现UI元素的拖拽、按下及释放等交互操作，并通过具体的代码示例展示了如何计算用户的点击位置。此外还提到了必要的组件如EventSystem和GraphicRaycaster的使用。

1、Unity 的IDragHandler、IPointerDownHandler、IPointerUpHandler

namespace UnityEngine.EventSystems
{
    public interface IDragHandler : IEventSystemHandler
    {
        void OnDrag(PointerEventData eventData);
    }
}

namespace UnityEngine.EventSystems
{
    public interface IPointerUpHandler : IEventSystemHandler
    {
        void OnPointerUp(PointerEventData eventData);
    }
}

namespace UnityEngine.EventSystems
{
    public interface IPointerDownHandler : IEventSystemHandler
    {
        void OnPointerDown(PointerEventData eventData);
    }
}

2、计算点击位置

using UnityEngine;
using UnityEngine.EventSystems;

public class GameBoard : MonoBehaviour/*UIBehaviour*/, IPointerDownHandler, IPointerUpHandler, IDragHandler
{
    public RectTransform touchLayerTrans;
    public virtual void OnPointerDown(PointerEventData eventData)
    {
        var touchPosition = GetCurrentHitPosition(eventData);
        Debug.Log("Point down " + touchPosition);
    }

    public virtual void OnPointerUp(PointerEventData eventData)
    {
        var touchPosition = GetCurrentHitPosition(eventData);
        Debug.Log("Point up " + touchPosition);
    }

    public virtual void OnDrag(PointerEventData eventData)
    {
        var touchPosition = GetCurrentHitPosition(eventData);
        Debug.Log("OnDrag " + touchPosition);
    }

    public Vector3 GetCurrentHitPosition(PointerEventData eventData)
    {
        var wordPosition = Camera.main.ScreenToWorldPoint(eventData.position);
        var localPosition = touchLayerTrans.InverseTransformPoint(wordPosition);
        return localPosition;
    }
}