一个简单的获得点击世界坐标的方法

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public bool ScreenPoitToWorldPointInRectangle(RectTransform rect, Vector2 screenPoint, Camera cam, out Vector3 worldPoint) {
   worldPoint = Vector3.zero;
   Ray ray = RectTransformUtility.ScreenPointToRay(cam, screenPoint);
   float enter;
   if(!new Plane(rect.rotation * Vector3.back, rect.position).Raycast(ray, out enter)) {
       return false;
   }
   
   worldPoint = ray.GetPoint(enter);
   return true;
}

要再获得ui的本地坐标的话就rectTransform.InverseTransformPoint(worldPoint)