我已经创建了一个玩家预置（在我的项目中称为Tim），并试图直接从一个玩家脚本（实际上附加到一个枪对象，这是玩家预置的子对象）中引用所有gameObjects和转换。

问题是我无法在脚本中引用摄像头，尽管我已经尝试了许多不同的方法，但似乎都不起作用。Unity在控制台中打印了此错误：“空引用异常：对象引用未设置为对象”“的示例。脚本如下：

public class Gun_Control : MonoBehaviour
{
// References for GameObjects
[SerializeField] private Rigidbody2D rb;
private GameObject Player;
[SerializeField] private Transform PlayerTransform;
private GameObject Gun;
[SerializeField] private Transform GunTransform;
private Camera MainCamera;
private GameObject firePoint;
[SerializeField] private Transform firePointTransform;
[SerializeField] private GameObject bulletPrefab;

// Variables for Shooting
private Vector2 mousePos;
private float bulletForce = 20f;

// Start is called at the beginning
void Start()
{
    Debug.Log("Starting");
    Player = GameObject.FindWithTag("Player");
    PlayerTransform = Player.transform;
    Gun = GameObject.FindWithTag("PlayerGun");
    GunTransform = Gun.transform;
    MainCamera = GameObject.FindWithTag("Camera").GetComponent<Camera>();
    firePoint = GameObject.FindWithTag("PlayerFirePoint");
    firePointTransform = firePoint.transform;
}

// Update is called once per frame
void Update()
{
    // Get mouse position
    mousePos = MainCamera.ScreenToWorldPoint(Input.mousePosition);

    // Run shoot function on left click
    if(Input.GetButtonDown("Fire1"))
    {
        Shoot();
    }
}

// Update is called on every physics frame
void FixedUpdate()
{
    // Set gun position to player position
    GunTransform.position = PlayerTransform.position;
    // Set gun rotation to mouse position
    Vector2 lookDir = mousePos - rb.position;
    float angle = Mathf.Atan2(lookDir.y ,lookDir.x) * Mathf.Rad2Deg - 180f;
    rb.rotation = angle;
}

void Shoot()
{
    // Instantiate a bullet at the firepoint and give it force
    GameObject bullet = Instantiate(bulletPrefab, firePointTransform.position, firePointTransform.rotation);
    Rigidbody2D rb = bullet.GetComponent<Rigidbody2D>();
    rb.AddForce(firePointTransform.up * bulletForce, ForceMode2D.Impulse);
}
}

现在我有一个变量，MainCamera，当脚本启动时，我会寻找一个标签为“Camera”且设置正确的相机。如果有人需要更多细节，我可以添加，并感谢大家抽出时间来帮助。
编辑1：我尝试了Thunderkill建议的方法，但似乎不起作用。下面是新代码的图片。

而当我尝试使用Debug.log（Camera.main）时;它打印null。