条件检查后统一功能分析中的协同作用

Question

我是团结的新手，我只是在创造一个简单的星系射击游戏，我希望只有当玩家出现的时候，敌人才会诞生。因此，我已经创建了一个协同线来检查playerExists条件，如果结果是true，它应该继续每5秒进行一次产卵。但出于某种原因，它只产生了一个敌人。我在这里有遗漏什么吗？下面是我的SpawnManager，在那里产卵行为是被控制的。

public class SpawnManager : MonoBehaviour {

[SerializeField]
private GameObject _enemyShipPrefab;
[SerializeField]
private GameObject[] _powerUp;
UIManager _uimanager;


// Use this for initialization
void Start () {
    _uimanager = GameObject.Find("Canvas").GetComponent<UIManager>();
    StartCoroutine(SpawnPowerUps());
    StartCoroutine(SpawnEnemy());

}

IEnumerator SpawnEnemy(){
    while (_uimanager.playerExists == true)
    {
            Vector3 position = new Vector3(Random.Range(-8.23f, 8.23f), 5.7f, 0.0f);
            Instantiate(_enemyShipPrefab, position, Quaternion.identity);
            yield return new WaitForSeconds(5.0f);
    }

}

}

下面是我的UIManager，在这里我控制着播放器的存在。

public class UIManager : MonoBehaviour {

// Use this for initialization
public bool playerExists = false; 
public int playerScores = 0; 
public Sprite[] lives;
public Image playerLivesImagesToBeShown;
public Text playerScoreToBeShown;
public Image titleImage;
public GameObject playerPrefab;
void Start()
{

}

void Update()
{

        if (Input.GetKeyDown(KeyCode.Space) && playerExists == false){
            titleImage.gameObject.SetActive(false);
            Instantiate(playerPrefab, new Vector3(0, 0, 0), Quaternion.identity);
            playerScores = 0;
            playerScoreToBeShown.text = "Score : 0";
            playerExists = true;
        }


}


public void updateLives(int livesToView ){
    playerLivesImagesToBeShown.sprite = lives[livesToView];
            if(livesToView == 0){
                playerExists = false;
                titleImage.gameObject.SetActive(true);
            }
}

Answer 1

在第一次看到代码(以及所描述的问题)时，我会说，您的SpawnEnemy()协同器在运行并退出之后。你必须把它锁在某个循环中，就像这样：

IEnumerator SpawnEnemy ()
{
    while (true) // Keep checking
    {
        if(_uimanager.playerExists == true)
        {
            Vector3 position = new Vector3(Random.Range(-8.23f, 8.23f), 5.7f, 0.0f);
            Instantiate(_enemyShipPrefab, position, Quaternion.identity);            
            yield return new WaitForSeconds (5.0f);  // After spawning waits 5secs
        }
        yield return null; // Starts loop with next frame.
    }
}