Unity 2D：检查点上的检查点生成无法正常工作

Question

最近我一直有一些问题，我的Unity项目。我一直试图为每个“x”单位生成检查点，但由于某种原因，前两个检查点成功产卵，但之后没有任何反应。

这是我在CheckpointGeneration.cs代码：

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

public class CheckpointGeneration : MonoBehaviour { 

    public GameObject checkpointPrefab; 

    int gap = 5; 
    List<GameObject> previousCheckpointList; 

    private void Start() 
    { 
     Vector3 targetPos = new Vector3(0, -2.35f); 
     Instantiate(checkpointPrefab, targetPos, 
      checkpointPrefab.transform.rotation); 
    } 

    private void Update() 
    { 
     if (CheckpointController.checkpointsReached != previousCheckpointList && CheckpointController.lastCheckpointReached != null) 
     { 
      previousCheckpointList = CheckpointController.checkpointsReached; 

      Vector3 targetPos = new Vector3(CheckpointController.lastCheckpointReached.transform.position.x + gap, CheckpointController.lastCheckpointReached.transform.position.y); 
      Instantiate(checkpointPrefab, targetPos, checkpointPrefab.transform.rotation); 
     } 
    } 
} 

这是CheckpointController.cs代码：

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

public class CheckpointController : MonoBehaviour { 

    public static List<GameObject> checkpointsReached = new List<GameObject>(); 
    public static GameObject lastCheckpointReached; 

    GameObject player; 

    private void Awake() 
    { 
     player = GameObject.FindGameObjectWithTag("Player"); 
    } 

private void Update() 
{ 
     if (checkpointsReached.Count > 0) 
     { 
      lastCheckpointReached = checkpointsReached[checkpointsReached.Count - 1]; 
     } 
    } 

    private void OnTriggerEnter2D(Collider2D collision) 
    { 
     if (collision.tag == "Player") 
     { 
      checkpointsReached.Add(gameObject); 
      GetComponent<SpriteRenderer>().color = new Color(0, 0.86f, 0.29f); 
     } 
     Debug.Log("Checkpoint Reached!"); 
    } 

    public void RespawnAtCheckpoint() 
    { 
     if (lastCheckpointReached != null) 
     { 
      player.transform.parent.position = lastCheckpointReached.transform.position; 
      player.GetComponent<PlayerManager>().isDead = false; 
      Camera.main.transform.position = GameObject.FindGameObjectWithTag("CameraFollow").transform.position; 
      Debug.Log("Respawning..."); 
     } else 
     { 

GameObject.FindGameObjectWithTag("GameController").GetComponent<ReloadLevel>().Reload(); 
     } 
    } 

} 

任何答案，将不胜感激！如果您需要更多信息，请发表评论，我将编辑问题以提供。

Answer 1

我对您的代码进行了更改，以便您了解一些简洁的代码。如果你不明白代码中的内容，请问我。我还为全局变量创建了另一个类。考虑到使用它，因为按名称查找游戏对象并不好。

public class GlobalClass : MonoBehaviour 
{ 
    //static objects are not seen in inspector so we will asign player to public gameobject and inside script we transfer it to static gameobject so now we can get player gameobject with GlobalClass.player 
    public static GameObject player; 
    public GameObject _player; 

    //With this you can set all other gameobjects like your GameController or something like that 

    private void Start() 
    { 
     player = _player; 
    } 
} 

public class CheckpointGeneration : MonoBehaviour 
{ 
    public GameObject checkpointPrefab; 

    public float gap = 5.0f; 
    public static int spawnedCheckpoints = 0; //You can alse set it as bool but with this you can maybe make to have 2 or more checkpoints 

    private static Vector2 lastCheckpointPos = new Vector2(0, -2.35f); 

    private void Start() 
    { 
     Instantiate(checkpointPrefab, lastCheckpointPos, checkpointPrefab.transform.rotation); 
     spawnedCheckpoints++; 
    } 

    private void Update() 
    { 
     if (spawnedCheckpoints < 1) 
     { 
      SpawnCheckpoint(); 
     } 
    } 

    public static void RespawnAtCheckpoint() 
    { 
     if (CheckpointGeneration.spawnedCheckpoints > 0) 
     { 
      GlobalClass.player.transform.parent.position = CheckpointGeneration.lastCheckpointPos; 
      GlobalClass.player.GetComponent<PlayerManager>().isDead = false; 
      Camera.main.transform.position = GameObject.FindGameObjectWithTag("CameraFollow").transform.position; 
      Debug.Log("Respawning..."); 
     } else 
     { 

      GameObject.FindGameObjectWithTag("GameController").GetComponent<ReloadLevel>().Reload(); 
     } 
    } //Call this method when player die 

    private static void SpawnCheckpoint() 
    { 
     Vector2 newCheckpointPos = new Vector2(lastCheckpointPos.x + gap, lastCheckpointPos.y); 
     Instantiate(checkpointPrefab, newCheckpointPos, checkpointPrefab.transform.rotation); //Consider using Quaternion.identity 
     lastCheckpointPos = newCheckpointPos; 
     spawnedCheckpoints++; 
    } 
} 

public class CheckpointController : MonoBehaviour 
{ 
    private void OnTriggerEnter2D(Collider2D collision) 
    { 
     if (collision.tag == "Player") 
     { 
      CheckpointGeneration.spawnedCheckpoints--; //with this we sent message to your CheckpointGeneration script that this checkpoint is reached 
      Debug.Log("Checkpoint Reached!"); 
      Destroy(gameObject);//When checkpoint is reached we destroy it and will spawn new one 
     } 
    } 
}