unity UGUI UI跟随

实现2dUI跟随游戏中角色的移动（应用于玩家名称，血条，称号）

using UnityEngine;

public class UI_Follow : MonoBehaviour
{
    public Camera m_camera;
    public Transform m_target;
    public RectTransform m_ui;
    
    private Vector3 position_sp;

    private void Awake()
    {
        if (m_camera == null)
        {
            m_camera = Camera.main;
        }
        if (m_ui == null && transform is RectTransform)
        {
            m_ui = (RectTransform)transform;
        }
    }

    private void LateUpdate()
    {
        position_sp = m_camera.WorldToScreenPoint(m_target.position);
        Format_Position(ref position_sp);
        m_ui.localPosition = position_sp;
    }

    private void Format_Position(ref Vector3 pos)
    {
        pos.x -= Content.screen_width_half;
        pos.y -= Content.screen_height_half;
        pos.x *= Content.screen_width_ratio;
        pos.y *= Content.screen_height_ratio;
    }
}

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