Unity3D C# 级别生成脚本未按预期工作

Question

基本上，我为 Unity 中的无尽奔跑游戏编写了这个关卡生成脚本。 问题是这些板的生成速度太快，任何移动设备都无法处理。 为了防止这种情况，我添加了这行代码：

yield return new WaitForSeconds(2);

但出于某种原因，我的脚本会尽可能快地生成板，而不是等待 2 秒。

我尝试切换评论该行，但无论我尝试什么都没有用。 任何人都可以看看吗？

这是完整的脚本：

using System.Collections.Generic;
using UnityEngine;

public class GenerateLevel : MonoBehaviour
{
    public GameObject[] section;
    public int zPos = 19;
    public bool creatingSection = false;
    public int secNum;
    
    void Update()
    {
        if (creatingSection == false)

            creatingSection = true;
            StartCoroutine(GenerateSection());
    }


    IEnumerator GenerateSection()
    {
        secNum = Random.Range(0, 3);
        Instantiate(section[secNum], new Vector3(0, 0, zPos), Quaternion.identity);
        zPos += 38;
        yield return new WaitForSeconds(2);
        creatingSection = false;
    }
}

Answer 1

这是一个典型的错字：没有大括号 ( { } ) 的if仅适用于下一个表达式，因此您的

if (creatingSection == false)
    creatingSection = true;
    StartCoroutine(GenerateSection());

基本上读

if (creatingSection == false)
{
    creatingSection = true;
}
StartCoroutine(GenerateSection());

这意味着您每帧都启动一个协程！

你想要的是

if (creatingSection == false)
{
    creatingSection = true;
    StartCoroutine(GenerateSection());
}

---

无论如何，与其冒险并在每一帧轮询检查一个标志，你更应该做的是有一个适当的方法来开始你的例程

public class GenerateLevel : MonoBehaviour
{
    [Header("Assets")]
    public GameObject[] section;

    [Header("Settings")]
    public int zPos = 19;
    
    private bool isGenerating;
    
    // This atttribute adds an entry to the context menu of this component
    // in the Inspector so you can still run it from there for testing
    // see https://docs.unity3d.com/ScriptReference/ContextMenu.html
    [ContextMenu(nameof(StartGenerating))]
    public void StartGenerating()
    {
        // also prevent multiple concurrent routines
        if(isGenerating) return;

        StartCoroutine(GenerateSection());
    }

    IEnumerator GenerateSection()
    {
        if(isGenerating) yield break;

        isGenerating = true;

        // I would go fully dynmic here and intad of hoping that there are 3 elements in "section"
        // rather rely on its actual length 
        // => you can easily add and remove items via the Inspector and it still works without touching the code
        var secNum = Random.Range(0, section.Length);
        Instantiate(section[secNum], new Vector3(0, 0, zPos), Quaternion.identity);
        zPos += 38;

        yield return new WaitForSeconds(2);

        isGenerating = false;
    }
}