* 겪고 있는 문제 상황을 최대한 자세하게 작성해주세요.

* 문제 해결을 위해 어떤 시도를 해보았는지 구체적으로 함께 알려주세요.

시간이 30초 지나면 끝내는건 설정이되었습니다.

하지만, 카드를 다 뒤집었을때 끝(endTxt)가 활성화되지않습니다..!

작성한 코드 및 에러 메세지

오류 발생 시, 작성한 코드 전체와 에러 메시지를 첨부해 주세요.

Tip 1) </> 아이콘을 눌러 코드박스를 만들어 보세요.

using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.UI;


public class gameManager : MonoBehaviour
{
    public Text timeTxt;
    public GameObject endTxt;
    public GameObject card;
    float time = 0.0f;
    public static gameManager I;
    public GameObject firstCard;
    public GameObject secondCard;


    void Awake()
    {
        I = this;
    }
    // Start is called before the first frame update
    void Start()
    {
        Time.timeScale = 1.0f;


        int[] rtans = { 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7 };


        rtans = rtans.OrderBy(item => Random.Range(-1.0f, 1.0f)).ToArray();


        for (int i = 0; i < 16; i++)
        {


            GameObject newCard = Instantiate(card);
            newCard.transform.parent = GameObject.Find("cards").transform;


            float x = (i / 4) * 1.4f - 2.1f;
            float y = (i % 4) * 1.4f - 3.0f;
            newCard.transform.position = new Vector3(x , y,  0);


            string rtanName = "rtan" + rtans[i].ToString();
            newCard.transform.Find("front").GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>(rtanName);


            Debug.Log(rtans[i]);
        }




    }


    // Update is called once per frame
    void Update()
    {
        time += Time.deltaTime;
        timeTxt.text = time.ToString("N2");


        if (time > 30.0f)
        {
            Time.timeScale = 0f;
            endTxt.SetActive(true);
        }
   




    }
    public void isMatched()
    {
        string firstCardImage = firstCard.transform.Find("front").GetComponent<SpriteRenderer>().sprite.name;
        string secondCardImage = secondCard.transform.Find("front").GetComponent<SpriteRenderer>().sprite.name;


        if (firstCardImage == secondCardImage)
        {
            Debug.Log("같다!");
            firstCard.GetComponent<card>().destroyCard();
            secondCard.GetComponent<card>().destroyCard();


            int cardsLeft = GameObject.Find("cards").transform.childCount;
            if(cardsLeft == 2)
            {
                endTxt.SetActive(true);
                Time.timeScale = 0f;
            }
        }
        else
        {
            Debug.Log("같지 않다!");
            firstCard.GetComponent<card>().closeCard();
            secondCard.GetComponent<card>().closeCard();


        }
        firstCard = null;
        secondCard = null;


    }


 
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;


public class card : MonoBehaviour
{
    public Animator anim;
    // Start is called before the first frame update
    void Start()
    {


    }


    // Update is called once per frame
    void Update()
    {


    }
    public void openCard()
    {
        anim.SetBool("isOpen", true);
        transform.Find("front").gameObject.SetActive(true);
        transform.Find("back").gameObject.SetActive(false);


        if (gameManager.I.firstCard == null)
        {
            gameManager.I.firstCard = gameObject;
        }
        else
        {
            gameManager.I.secondCard = gameObject;
            gameManager.I.isMatched();
        }
    }
    public void destroyCard()
    {
        Invoke("destroyCardInvoke", 1.0f);
    }


    void destroyCardInvoke()
    {
        Destroy(gameObject);
    }


    public void closeCard()
    {
        Invoke("closeCardInvoke", 1.0f);
    }


    void closeCardInvoke()
    {
        anim.SetBool("isOpen", false);
        transform.Find("back").gameObject.SetActive(true);
        transform.Find("front").gameObject.SetActive(false);
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;


public class endTxt : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        
    }


    // Update is called once per frame
    void Update()
    {
        
    }
    public void retryGame()
    {
        SceneManager.LoadScene("MainScene");
    }
}