Unity中Prefab实例化敌人时UI生命值文本不加载的问题

我制作了一个采用World Space渲染模式的Canvas，用于在敌人前方显示其生命值文本。将包含该文本子对象的Enemy制作成Prefab后，通过代码实例化敌人时，文本无法正常显示，但直接将Prefab拖拽到场景中却能正常工作。以下是相关脚本代码及截图：

Enemy控制脚本 #

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class EnemyControl : MonoBehaviour
{
    public Text HealthText;
    public int Health = 20;
    // Start is called before the first frame update
    void Start()
    {
        UpdateLifeDisplay();
    }

    // Update is called once per frame
    void Update()
    {
        Death();
        UpdateLifeDisplay();
    }

    public void Death()
    {
        if(Health < 0)
        {
            Destroy(this.gameObject);
        }

    }

    void UpdateLifeDisplay()
    {

        if (HealthText != null)
        {
            HealthText.text = Health.ToString();
        }
        else
        {
            Debug.Log("LifeDisplay null");
        }
    }

}

生成器脚本（SpawnHandle） #

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SpawnHandle : MonoBehaviour
{
    //Upgrades
    public GameObject[] Upgrades;
    private int counter = 0;

    public Transform SpawnPoint;
    public Transform locA, locB;


    //Enemy
    public GameObject enemyPref;
    public Transform[] eSpawn;
    private int Ecounter = 0;




    void Start()
    {
        counter++;
        Ecounter++;
    }


    void Update()
    {
        if (counter > 0)
        {
            int randomIndex = Random.Range(0, Upgrades.Length );
            int randomIndex2 = Random.Range(0, Upgrades.Length );

            Instantiate(Upgrades[randomIndex], locA.position, SpawnPoint.rotation);
            Instantiate(Upgrades[randomIndex2], locB.position, SpawnPoint.rotation);

            counter = 0; 
            StartCoroutine(increase());
        }

        if (Ecounter > 0)
        {

            int randomE = Random.Range(0, 2);

            Instantiate(enemyPref, eSpawn[randomE].position, SpawnPoint.rotation);

            Ecounter = 0; 
            StartCoroutine(EnemyCounter());
        }

    }


    void spawn()
    {

    }

    IEnumerator increase()
    {
        yield return new WaitForSeconds(10f);
        counter++;
    }

    IEnumerator EnemyCounter()
    {
        yield return new WaitForSeconds(3.33f);
        Ecounter++;
    }
}

文本脚本（FloatingText） #

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class FloatingText : MonoBehaviour
{
    public Transform mainCam;
    public Transform target;
    public Transform worldSpaceCanvas;
    public Vector3 offset;


    private void Start()
    {
        mainCam = Camera.main.transform;
        transform.SetParent(worldSpaceCanvas);

    }
    void Update()
    {

        if (target == null)
        {
            Destroy(this.gameObject);
            return;
        }

        transform.rotation = Quaternion.LookRotation(transform.position - mainCam.transform.position); // 朝向相机

        transform.position = target.position + offset;
 
    }
}

相关截图 #

Prefab截图 #

UI截图 #

内容的提问来源于stack exchange，提问作者Qatawneh Razvan