代码控制人物选择角色

   public GameObject[] characterPrefabs;//在外部赋值的角色
    private GameObject[] characterGameObjects;//在代码中赋值的角色
    private int selectIndex = 0; //当前选择的角色
    private int length; //所有可供选择的角色的个数


    private void Start()
    {
        length = characterPrefabs.Length;
        characterGameObjects = new GameObject[length];
        for (int i = 0; i < length; i++)
        {
            characterGameObjects[i] =GameObject.Instantiate(characterPrefabs[i], transform.position, transform.rotation) as GameObject;
        }
        UpdateCharacterShow();
    }

    //更新所有角色的显示
    void UpdateCharacterShow()
    {
        characterGameObjects[selectIndex].SetActive(true);
        //把未选择的角色设置为隐藏
        for (int i = 0; i < length; i++)
        {
            if (i != selectIndex)
            {
                characterGameObjects[i].SetActive(false);
            }
        }

    }

    //点击下一个按钮
    public void OnNextButtonClick()
    {    
        selectIndex++;
        //跟length求余 超出范围索引为0
        selectIndex %= length;
        UpdateCharacterShow();

    }

    //点击上一个按钮
    public void OnPrevButtonClick()
    {
        selectIndex--;
        //如果等于负1，就循环到最大的索引
        if (selectIndex == -1)
        {            
            selectIndex = length - 1;
        }
        UpdateCharacterShow();
    }