如何在 switch 语句中从另一个脚本更改变量的值？

问：

我正在构建一个统一的游戏，我希望玩家能够购买永久升级（它将一直持续到游戏结束）。

我的gameObject上有这个脚本：shopManager

public class ShopManager : MonoBehaviour
{
    public int coins;

    //References
    public PlayerController playerCon;
    public HurtEnemy[] hurtEnms;
    public HurtPlayer[] hurtPlas;

    // Start is called before the first frame update
    void Start()
    {
        playerCon = FindObjectOfType<PlayerController>();
        hurtEnms = FindObjectsOfType<HurtEnemy>(); //there are a few weapons that can hurt enemies
        hurtPlas = FindObjectsOfType<HurtPlayer>(); //there are a few enemies that can hurt the player
    }

    public void BuyItem(ShopItem item)
    {
        if (coins>=item.price)
        {
            coins -= item.price;
            ApplyChangesToPlayer(item);
        }
    }

    public void ApplyChangesToPlayer(ShopItem item)
    {
        switch (item.name)
        {
            case "Speed":
                playerCon.speed += 1f;
                break;
            case "Strength": //doing more damage
                foreach (var hurtEnm in hurtEnms)
                    hurtEnm.damage++;
                break;
            case "Reduced damage": //all enemies do less damage
                foreach (var hurtPla in hurtPlas)
                    hurtPla.damagePerHit--;
                break;
            case "Weapon": 
                playerCon.hasWeapon = true;
                break;
        }
    }
}

只有当我选择速度时才会提供提升，但它对其他人不起作用。

我尝试获取的变量（和）在定义它们的脚本中是公开的：hasWeapondamagedamagePerHit

public class HurtEnemy : MonoBehaviour
{
    public int damage;
}

public class HurtPlayer : MonoBehaviour
{
    public int damagePerHit;
}

public class PlayerController : MonoBehaviour
{
    public float speed;
    public bool hasWeapon=false;
}

我不明白为什么速度提升有效，而其他人则不行。