Unity C#中如何让父类触发子类PrimaryInteraction提前返回

我是一名学习Unity的学生程序员，遇到以下问题：

• 有Weapon父类和Gun子类，父类PrimaryInteraction方法中，若武器未被玩家手持（父物体不是Hand），会打印警告并return。
• 子类Gun重写的PrimaryInteraction调用base.PrimaryInteraction()后，即便父类return，子类仍会执行后续代码。
• 由于大量类继承自相关接口，无法修改PrimaryInteraction的返回类型，也不想用异常处理，求优雅解决方案。

原代码 #

Weapon类 #

public override void PrimaryInteraction() {
    if (transform.parent == null || transform.parent.name != "Hand")
    {
        Debug.LogWarning("Weapon is not being held by a player!");
        return;
    }
}

Gun类 #

public override void PrimaryInteraction() 
{
    base.PrimaryInteraction();
    if (!_gunModel.Automatic && Time.time >= _nextTimeToFire) {
        _nextTimeToFire = Time.time + 1f / _gunModel.FireRate;
        Shoot();
        return;
    }
    _isShooting=true;
}

输入处理代码 #

public void HandlePrimaryAction()
{
    GameObject objectInHand = _handController.GetObjectInHand();
    
    if (HandleObjectInHand(objectInHand)) return;
    
    if (Physics.Raycast(_playerCamera.transform.position, _playerCamera.transform.forward, out RaycastHit hit, 5f, _interactableLayer))
    {
        HandleRaycastHit(hit);
    }
}

private bool HandleObjectInHand(GameObject obj)
{
    if (obj == null) return false;

    if (obj.TryGetComponent(out IConsumableObject consumable))
    {
        _inventoryManager.ConsumeCurrentItem();
        return true;
    }

    if (obj.TryGetComponent(out Weapon weapon))
    {
        weapon.PrimaryInteraction();
        return true;
    }

    return false;
}
private void HandleRaycastHit(RaycastHit hit)
{
    GameObject objectInHand = _handController.GetObjectInHand();
    
    if (hit.collider.TryGetComponent(out IRequiredObjectInteraction requiredInteraction) && objectInHand != null)
    {
        requiredInteraction.RequiredObjectInteraction(objectInHand);
    }
    
    if (hit.collider.TryGetComponent(out IInteractableObject interactable))
    {
        interactable.PrimaryInteraction();
        _currentInteractableObject = interactable;
    }
    
    if (hit.collider.TryGetComponent(out DraggableObject draggable) && !objectInHand)
    {
        DragObject(draggable);
    }
}

优雅解决方案 #

方案1：提取父类校验逻辑为独立方法 #

在Weapon类中新增受保护的校验方法，子类调用该方法判断是否继续执行：

修改后的Weapon类：

public override void PrimaryInteraction() {
    if (!IsWeaponHeld())
    {
        Debug.LogWarning("Weapon is not being held by a player!");
        return;
    }
}

protected bool IsWeaponHeld()
{
    return transform.parent != null && transform.parent.name == "Hand";
}

修改后的Gun类：

public override void PrimaryInteraction() 
{
    base.PrimaryInteraction();
    if (!IsWeaponHeld()) return; // 新增校验逻辑
    
    if (!_gunModel.Automatic && Time.time >= _nextTimeToFire) {
        _nextTimeToFire = Time.time + 1f / _gunModel.FireRate;
        Shoot();
        return;
    }
    _isShooting=true;
}

方案2：父类设置受保护的状态标记 #

在Weapon类中添加布尔字段标记武器是否可交互，子类通过该字段判断：

修改后的Weapon类：

protected bool _canInteract = false;

public override void PrimaryInteraction() {
    _canInteract = transform.parent != null && transform.parent.name == "Hand";
    if (!_canInteract)
    {
        Debug.LogWarning("Weapon is not being held by a player!");
        return;
    }
}

修改后的Gun类：

public override void PrimaryInteraction() 
{
    base.PrimaryInteraction();
    if (!_canInteract) return; // 新增状态判断
    
    if (!_gunModel.Automatic && Time.time >= _nextTimeToFire) {
        _nextTimeToFire = Time.time + 1f / _gunModel.FireRate;
        Shoot();
        return;
    }
    _isShooting=true;
}

方案3：输入处理阶段提前校验 #

既然PrimaryInteraction仅应在武器被手持时调用，直接在输入处理阶段做校验，避免无效调用：

修改HandleObjectInHand方法：

private bool HandleObjectInHand(GameObject obj)
{
    if (obj == null) return false;

    if (obj.TryGetComponent(out IConsumableObject consumable))
    {
        _inventoryManager.ConsumeCurrentItem();
        return true;
    }

    if (obj.TryGetComponent(out Weapon weapon))
    {
        // 提前校验是否手持
        if (weapon.transform.parent != null && weapon.transform.parent.name == "Hand")
        {
            weapon.PrimaryInteraction();
        }
        else
        {
            Debug.LogWarning("Weapon is not being held by a player!");
        }
        return true;
    }

    return false;
}

此方案可选择保留或移除Weapon类PrimaryInteraction中的校验逻辑作为双重保障。

内容的提问来源于stack exchange，提问作者Oroitz Lago Ramos