Question

我对在 Unity 上创建手机游戏还很陌生，所以我最近遇到了一个问题。我的库存需要一个项目（用于治疗玩家的急救），当游戏在统一运行时，我按下设备模拟器设备包上的项目并且它工作（Debug.Log 显示它正在控制台上使用）。我构建并运行到我的模拟器（LD 播放器）上，但项目功能不起作用。它显示按钮正在被按下，但由于某种原因该功能没有运行。

    public void UseItem()
    {
        //Use the healing pack
        if(item != null)
        {
            Debug.Log("Healing has occured!");
            //Heal the player by a certain amount, then delete item.
            item.Heal(healAmount, player);
            item.RemoveFromInventory();
        }
    }

玩家有一个 Heal() 函数，可以将玩家当前的生命值增加一定数量并相应地修改生命值条。

    public void RemoveFromInventory()
    {
        //remove the item from the inventory.
        Inventory.instance.Remove(this);
    }

public void Remove(Item item)
{
    //Remove the item from the list.
    items.Remove(item); 
    if (onItemChangedCallback != null)
    {
        onItemChangedCallback.Invoke();
    }
}

更新：我通过 Android Studio 运行 logcat，得到的错误是

2021-04-05 12:19:35.119 3615-3634/? I/Unity: Healing has occured!
    UnityEngine.Logger:Log(LogType, Object)
    InventorySlot:UseItem()
    UnityEngine.Events.UnityAction:Invoke()
    UnityEngine.Events.UnityEvent:Invoke()
    UnityEngine.EventSystems.EventFunction`1:Invoke(T1, BaseEventData)
    UnityEngine.EventSystems.ExecuteEvents:Execute(GameObject, BaseEventData, EventFunction`1)
    UnityEngine.EventSystems.StandaloneInputModule:ProcessTouchPress(PointerEventData, Boolean, Boolean)
    UnityEngine.EventSystems.StandaloneInputModule:ProcessTouchEvents()
    UnityEngine.EventSystems.StandaloneInputModule:Process()
2021-04-05 12:19:35.123 3615-3634/? E/Unity: NullReferenceException: Object reference not set to an instance of an object.
      at Item.Heal (System.Int32 amount, PlayerBehavior currentPlayer) [0x00000] in <00000000000000000000000000000000>:0 
      at InventorySlot.UseItem () [0x00000] in <00000000000000000000000000000000>:0 
      at UnityEngine.Events.UnityAction.Invoke () [0x00000] in <00000000000000000000000000000000>:0 
      at UnityEngine.Events.UnityEvent.Invoke () [0x00000] in <00000000000000000000000000000000>:0 
      at UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1].Invoke (T1 handler, UnityEngine.EventSystems.BaseEventData eventData) [0x00000] in <00000000000000000000000000000000>:0 
      at UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) [0x00000] in <00000000000000000000000000000000>:0 
      at UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchPress (UnityEngine.EventSystems.PointerEventData

这很奇怪，因为我设置了 Start() 函数来搜索带有“玩家”标签的游戏对象，然后从该玩家那里获取脚本。

最终更新：我更改了我的 Heal() 函数，以便每当它被调用时，我都会搜索播放器，现在它可以正常工作了。

public virtual void Heal(int amount, PlayerBehavior currentPlayer)
    {
        currentPlayer = GameObject.FindGameObjectWithTag("Player").GetComponent<PlayerBehavior>();
        //increase the player health by the amount the pack gives.
        currentPlayer.HealDamage(amount);
    }

功能适用于 Unity，不适用于手机

0 个答案: