保存游戏对象层始终以默认值结束(Unity+VS)

所以,我一直在遵循这个指南: https://www.youtube.com/watch?v=RQyfHmf7v9s 制作一个太空射击游戏。

但似乎有一行代码(这一行:)

            gameObject.layer = correctLayer;

每次都将我的对象转换为“默认”层。 这是代码:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
[AddComponentMenu("WaterEffects/ForCamera")]
public class HitHandler : MonoBehaviou {

public int health = 1; //Object health

float invulnTimer = 0.25f; //Time in which the gameObject is invulnerable
int correctLayer; // save the original layer of the object

void start()
{
    correctLayer = gameObject.layer;    
    gameObject.SetActive(true);
}

void OnTriggerEnter2D()
{
    Debug.Log("Trigger!");
    health--;
    invulnTimer = 2f;
    gameObject.layer = 10; //put object in invulnerable layer
}
// Update is called once per frame
void Update()
{
    invulnTimer -= Time.deltaTime;
    if (invulnTimer <= 0)
    {
        gameObject.layer = correctLayer; //returns object to original layer (doesnt work)
    }
    if (health <= 0)
    {
        Die();
    }
}
void Die()
{
    Destroy(gameObject); // Destroys object
}
}

我不知道为什么start函数不保存正确的层,即使在unity中,我已经将对象定义为它们的反射层。

注意:我已经使对象运动并检查了IsTrigger。当第一行代码未被使用时,它确实起作用。