Unity 全局屏幕点击特效

思路：

1、生成一个点击特效实例，每点击屏幕，就调整特效实例的位置并控制特效的显隐状态即可。

2、需要注意要保证在编辑器开发时或手机上运行时都要显示点击效果。

方案一 （推荐）

using UnityEngine;
using UnityEngine.EventSystems;

public class ScreenClick : MonoBehaviour,IPointerDownHandler
{
    public GameObject effectPrefab;//特效预制体
    private GameObject clickEffectInstance;
    private RectTransform _Rect;
    
    void Start()
    {
        _Rect = GetComponent<RectTransform>();
        clickEffectInstance = Instantiate(effectPrefab, transform);
        clickEffectInstance.SetActive(false);
    }
    
    public void OnPointerDown(PointerEventData eventData)
    {
        clickEffectInstance.SetActive(false);
        RectTransformUtility.ScreenPointToWorldPointInRectangle(_Rect,eventData.position,eventData.enterEventCamera,out Vector3 pos);
        clickEffectInstance.transform.position = pos;
        clickEffectInstance.SetActive(true);
    }
}

方案二

using UnityEngine;

public class ScreenClick : MonoBehaviour
{
    public GameObject effectPrefab;//特效预制体
    public Camera _Camera;
    private GameObject clickEffectInstance;
    private RectTransform _Rect;
    
    void Start()
    {
        _Rect = GetComponent<RectTransform>();
        clickEffectInstance = Instantiate(effectPrefab, transform);
        clickEffectInstance.SetActive(false);
    }

    void Update()
    {
#if UNITY_EDITOR
        if (Input.GetKeyDown(KeyCode.Mouse0))
        {
            clickEffectInstance.SetActive(false);
            var screenPos = Input.mousePosition;
            ShowClickEffect(screenPos);
            Debug.Log("222");

        }
#elif UNITY_ANDROID||UNITY_IOS
        if (Input.touchCount > 0)
        {
            var touch = Input.GetTouch(0);
            if (touch.phase == TouchPhase.Began)
            {
                clickEffectInstance.SetActive(false);
                var screenPos = Input.GetTouch(0).position;
                ShowClickEffect(screenPos);
                Debug.Log("333");
            }
        }
#endif
    }
    
    /// <summary>
    /// 显示点击特效
    /// </summary>
    /// <param name="screenPos">点击的屏幕位置</param>
    private void ShowClickEffect(Vector2 screenPos)
    {
        RectTransformUtility.ScreenPointToWorldPointInRectangle(_Rect, screenPos, _Camera, out Vector3 pos);
        clickEffectInstance.transform.position = pos;
        clickEffectInstance.SetActive(true);
    }
}