Unity C# - 从基础 class 动态调用 subclass

Question

我是 C# 和 Unity 的新手，我正在尝试弄清楚如何通过基础 class.

处理子classes

我正在制作纸牌游戏。我制作了一个 baseclass PlayerCard，其中包含子classes，例如 Minion : PlayerCard.

我目前的结构是 PlayerCard class 一开始就从牌组中这样实例化

public class PlayerDeck : MonoBehaviour{

[SerializeField] PlayerCard[] playerCardArray;

private int xPos = 2;


public void DrawCards()
{
    var cardIndex = Random.Range(0, playerCardArray.Length);
    AddCardToPlayer(playerCardArray[cardIndex]);
}

private void AddCardToPlayer(PlayerCard myCard)
{

    Vector3 cardPos = new Vector3(transform.position.x + xPos, transform.position.y, transform.position.z);
    PlayerCard newCard = Instantiate(myCard, cardPos, transform.rotation) as PlayerCard;
    xPos = xPos + 2;
}

我想要我的基地class (PlayerCard) 处理所有平凡的事情，例如拖放和移动卡片，因为它们对所有卡片都是相同的。

    private void OnMouseDown()
{
    ToggleDrag();
}

void Update()
{
    if (DraggingON) { Drag(); }
}

private void ToggleDrag()
{
    Debug.Log(playerCard);
    mouseOffset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, mouseScreenPoint.z));

    if (DraggingON)
    {
        DraggingON = false;
        SnapCardToPosition();
    }
    else
    {
        DraggingON = true;

        SnapPositionX = transform.position.x;   //Return to same x position if user has not hovered other available slot
        SnapPositionY = transform.position.y;   //Return to same y position if user has not hovered other available slot

        //Variables above will be reset to default position x/y when user has hovered a slot but then moved object away from the slot, so reset to default
        defaultPositionX = transform.position.x;
        defaultPositionY = transform.position.y;
    }
}

private void Drag()
{
    Vector3 currentMouseScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, mouseScreenPoint.z);
    Vector3 currentMousePosition = Camera.main.ScreenToWorldPoint(currentMouseScreenPoint) + mouseOffset;
    transform.position = currentMousePosition;
}

我的问题在于，当调用 SnapCardToPosition 时，我希望 subclass（无论它是什么）接管并处理与它们被拖入的位置的交互。

    private void SnapCardToPosition()
{
    Vector2 NewCardPosition = new Vector2(SnapPositionX, SnapPositionY);
    transform.position = NewCardPosition;

    //Dynamically call the subclass here?
}

所以子class看起来像这样

public class Minion : PlayerCard{
[SerializeField] int Damage = 1;


public void HandleCardPlacement()
{
    //Do something
}

我还没有弄清楚如何使用我的结构来实现这一点，或者它根本上是错误的吗？

Answer 1

让你的方法不是private（=只有这个class可以看到这个）而是protected（=这个和任何派生的class可以看到这个）
并使您的方法 virtual (if there is a common base behavior) or abstract (if every card has to implement it from scratch) and override 在子class

在你的基地class例如

protected virtual void SnapCardToPosition()
{
    Vector2 NewCardPosition = new Vector2(SnapPositionX, SnapPositionY);
    transform.position = NewCardPosition;
}

然后在子class

protected override void SnapCardToPosition()
{
    // make sure that the base implementation is executed first
    base.SnapCardToPosition();

    // do additional stuff
}

所以这里每个子class可以决定

是override方法还是简单地保持他默认的基础之一class
如果它覆盖它可以决定 if 和 when 通过 base.SnapCardToPosition();[=35= 调用默认行为]

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