Convert to UI coordinates based on the mouse click position

Sometimes some Tips interfaces in the game need to dynamically display the location of the Tips interface based on the clicked position.

This case is very useful.

using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// 测试根据鼠标点击的位置来转换成UI坐标
/// </summary>
public class PosTransPanel : MonoBehaviour
{
    private Image _image = null;
    private Camera _camera = null;
    private Transform _canvasTrans = null;
    void Start()
    {
        _image = transform.parent.Find("Image").GetComponent<Image>();
        _camera = Camera.main;
        _canvasTrans = transform.parent;
    }

    private void LateUpdate()
    {
        //鼠标左键点击
        if (Input.GetKeyDown(KeyCode.Mouse0))
        {
            //获取鼠标点击的坐标
            Vector3 screenPos = _camera.WorldToScreenPoint(Input.mousePosition);
            //把屏幕坐标转换成UI坐标
            _image.transform.localPosition = ScreenToUIPos(screenPos);
        }
    }

    /// <summary>
    /// 屏幕坐标转换成UI坐标
    /// </summary>
    /// <param name="spos">屏幕坐标</param>
    /// <returns>UI坐标</returns>
    public Vector2 ScreenToUIPos(Vector3 screenPos)
    {
        Vector2 localPos;
        // 画布Canvas 屏幕坐标 相机 转换后的UI坐标
        RectTransformUtility.ScreenPointToLocalPointInRectangle(_canvasTrans as RectTransform, screenPos, _camera, out localPos);
        return localPos;
    }
}