Unity UI 局部坐标转屏幕坐标

using UnityEngine;

public class GetScreenCoordinatesTest : MonoBehaviour
{
    public GameObject obj;
    // Start is called before the first frame update
    void Start()
    {
        Rect rect = GetScreenCoordinates(transform.GetComponent());
        obj.transform.position = new Vector3(rect.x, rect.y,obj.transform.position.z);
    }
    public Rect GetScreenCoordinates(RectTransform uiElement)
    {
        var worldCorners = new Vector3[4];
        uiElement.GetWorldCorners(worldCorners);
        var result = new Rect(
                      worldCorners[0].x + (worldCorners[2].x - worldCorners[0].x)/2,
                      worldCorners[0].y + (worldCorners[2].y - worldCorners[0].y)/2,
                      worldCorners[2].x - worldCorners[0].x,
                      worldCorners[2].y - worldCorners[0].y);

        Debug.Log(result);
        return result;
    }

}