Question

在创建我的塔防游戏的过程中，我偶然发现了基于塔类的精灵渲染问题（因此一次加载了两种不同类型的塔）。我的问题基本上是如何以安全的方式加载这些精灵，我可以从中创建多个塔类。

我有两个塔式预制件，例如，我的游戏控制器脚本中的塔式每个都是FIRST_TOWER或SECOND_TOWER（我有游戏控制器和塔式脚本）。

public enum TowerType
{
FIRST_TOWER,
SECOND_TOWER

}

我试图在游戏开始时使用以下方法为不同的塔类加载主精灵：

private void Start(){

AllTowers.Add (new Tower (2, 3f, "TowerSprites/FTower"));
AllTowers.Add (new Tower (5, 1, "TowerSprites/STower"));

}

我的Tower脚本中提到了AllTowers，而TowerSprites是资源资源中的文件夹（FTower和STower是两个不同类别的塔楼）。

private void Start()
{
gcs = FindObjectOfType<GameControllerScr>();

selfTower = gcs.AllTowers[(int)selfType]; // Unity error leads here
GetComponent<SpriteRenderer> ().sprite = selfTower.Spr;
}

此外，unity还提到了一个NullReferenceException：对象引用未设置为selfTower行中的对象实例。

以及其他方法，包括Cooldown（可以工作）和加载精灵

public class Tower // From Tower Defense
{

public float range, Cooldown, CurrCooldown = 0;
public Sprite Spr; 

public Tower(float range, float cd, string path)
{
    this.range = range;
    Cooldown = cd;
    Spr = Resources.Load<Sprite> (path);
}


}

问题是，sprite不会从我的资源文件加载，我希望它在游戏开始时加载，因为我想在商店中实现不同的塔类我会稍后放入我的游戏。我怎么能这样做？

（PS：没有编译器错误）

我添加了我的游戏控制器和塔式脚本的完整脚本，以便发现可能影响它的其他一些问题。

我对团结和编码都很陌生......但我想从错误中吸取教训，谢谢。

Full Tower Script

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

public class TowerScr : MonoBehaviour {

public GameObject Projectile;
Tower selfTower;
public TowerType selfType;
GameControllerScr gcs;

private void Start()
{
    gcs = FindObjectOfType<GameControllerScr>();

    selfTower = gcs.AllTowers[(int)selfType];
    GetComponent<SpriteRenderer> ().sprite = selfTower.Spr;
}

private void Update()
{
    if (CanShoot ())
        SearchTarget ();

    if (selfTower.CurrCooldown > 0)
        selfTower.CurrCooldown -= Time.deltaTime;
}

bool CanShoot()
{
    if (selfTower.CurrCooldown <= 0)
        return true;
    return false;
}

void SearchTarget()
{
    Transform nearestEnemy = null;
    float nearestEnemyDistance = Mathf.Infinity;

    foreach(GameObject enemy in GameObject.FindGameObjectsWithTag("Enemy")) 
    {
        float currDistance = Vector2.Distance (transform.position, enemy.transform.position);

        if (currDistance < nearestEnemyDistance &&
            currDistance <= selfTower.range) 
        {
            nearestEnemy = enemy.transform;
            nearestEnemyDistance = currDistance;
        }
    }

    if (nearestEnemy != null)
        Shoot (nearestEnemy);
}



void Shoot(Transform enemy)
{
    selfTower.CurrCooldown = selfTower.Cooldown;

    GameObject proj = Instantiate (Projectile);
    proj.GetComponent<TowerProjectileScr> ().selfProjectile = gcs.AllProjectiles [(int)selfType];
    proj.transform.position = transform.position;
    proj.GetComponent<TowerProjectileScr> ().SetTarget (enemy);
}


}

完整游戏控制器脚本

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


public class Tower // From Tower Defense
{

public float range, Cooldown, CurrCooldown = 0;
public Sprite Spr; 

public Tower(float range, float cd, string path)
{
    this.range = range;
    Cooldown = cd;
    Spr = Resources.Load<Sprite> (path);
}


}

public class TowerProjectile // separate gameobject with different Script
{
public float speed;
public int damage;
public Sprite Spr;

public TowerProjectile(float speed, int dmg, string path)
{
    this.speed = speed;
    damage = dmg;
    Spr = Resources.Load<Sprite>(path);
}


}

public enum TowerType
{
FIRST_TOWER,
SECOND_TOWER

}

public class GameControllerScr : MonoBehaviour {

public List<Tower> AllTowers = new List<Tower>();
public List<TowerProjectile> AllProjectiles = new List<TowerProjectile>();

private void Start()
{
    AllTowers.Add (new Tower (2, 3f, "TowerSprites/FTower"));
    AllTowers.Add (new Tower (5, 1, "TowerSprites/STower"));


    AllProjectiles.Add (new TowerProjectile (7, 10, "ProjectilesSprites/FProjectile"));
    AllProjectiles.Add(new TowerProjectile(3, 30, "ProjectilesSprites/SProjectile"));

}
}

Unity游戏：从资源文件中加载sprite，用于塔防游戏中塔的不同类别

0 个答案: