如何在指定的随机间隔内生成敌人？

Question

我希望让敌人以 5 到 15 秒之间的随机间隔生成。

这是我现在拥有的代码。我有预制敌人的移动/变换脚本。

using UnityEngine;
using System.Collections;

public class Spawner : MonoBehaviour {

    public float spawnTime = 5f;        // The amount of time between each spawn.
    public float spawnDelay = 3f;       // The amount of time before spawning starts.        
    public GameObject[] enemies;        // Array of enemy prefabs.

    public void Start ()
    {
        // Start calling the Spawn function repeatedly after a delay .
        InvokeRepeating("Spawn", spawnDelay, spawnTime);
    }

    void Spawn ()
    {
        // Instantiate a random enemy.
        int enemyIndex = Random.Range(0, enemies.Length);
        Instantiate(enemies[enemyIndex], transform.position, transform.rotation);
    }
}

目前每 3 秒生成一次敌人。如何每 5 到 15 秒生成一个敌人？

Answer 1

对于这种情况，您可能需要使用WaitForSeconds 调用。它是一个 YieldInstruction，它将暂停协程一段时间。

因此，您创建了一个方法来执行实际的生成，使其成为协程，然后在进行实际的实例化之前，等待您的随机时间段。看起来像这样：

using UnityEngine;
using System.Collections;

public class RandomSpawner : MonoBehaviour 
{

    bool isSpawning = false;
    public float minTime = 5.0f;
    public float maxTime = 15.0f;
    public GameObject[] enemies;  // Array of enemy prefabs.

    IEnumerator SpawnObject(int index, float seconds)
    {
        Debug.Log ("Waiting for " + seconds + " seconds");

        yield return new WaitForSeconds(seconds);
        Instantiate(enemies[index], transform.position, transform.rotation);

        //We've spawned, so now we could start another spawn     
        isSpawning = false;
    }

    void Update () 
    {
        //We only want to spawn one at a time, so make sure we're not already making that call
        if(! isSpawning)
        {
            isSpawning = true; //Yep, we're going to spawn
            int enemyIndex = Random.Range(0, enemies.Length);
            StartCoroutine(SpawnObject(enemyIndex, Random.Range(minTime, maxTime)));
        }
    }
}

试一试。应该可以的。