遇到 Unity C# 时间延迟/协程问题

Question

我正在尝试编写一个脚本，当您按下一个按钮以使其实例化一张随机稀有度的卡片时，我需要在一小段延迟后删除这些卡片，尽管我认为延迟不起作用，因为这些卡片似乎会立即消失

代码：

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

public class CardMasterScript : MonoBehaviour
{
    public GameObject[] CardArray = new GameObject[8];
    public float RollNumber;

    public void RollCard()
    {
        RollNumber = Random.Range(0.1f, 100);

        Debug.Log("Number Rolled: " + RollNumber);

        if(RollNumber <= 47.9)
        {
            var card = Instantiate(CardArray[0]);
            StartCoroutine(TimeDelay());
            Destroy(card);
        } else if(RollNumber > 47.9 && RollNumber <= 77.9)
        {
            var card = Instantiate(CardArray[1]);
            StartCoroutine(TimeDelay());
            Destroy(card);
        } else if( RollNumber > 77.9 && RollNumber <= 87.9)
        {
            var card = Instantiate(CardArray[2]);
            StartCoroutine(TimeDelay());
            Destroy(card);
        } else if(RollNumber > 87.9 && RollNumber <= 94.9)
        {
            var card = Instantiate(CardArray[3]);
            StartCoroutine(TimeDelay());
            Destroy(card);
        } else if(RollNumber > 94.9 && RollNumber <= 97.9)
        {
            var card = Instantiate(CardArray[4]);
            StartCoroutine(TimeDelay());
            Destroy(card);
        } else if(RollNumber > 97.9 && RollNumber <= 99.4)
        {
            var card = Instantiate(CardArray[5]);
            StartCoroutine(TimeDelay());
            Destroy(card);
        } else if(RollNumber > 99.4 && RollNumber <= 99.9)
        {
            var card = Instantiate(CardArray[6]);
            StartCoroutine(TimeDelay());
            Destroy(card);
        } else if (RollNumber > 99.9 && RollNumber <= 100)
        {
            var card = Instantiate(CardArray[7]);
            StartCoroutine(TimeDelay());
            Destroy(card);
        }
    }
    
    public IEnumerator TimeDelay()
    {
        yield return new WaitForSeconds(0.5f);
    }
}

• 如果你知道如何解决这个问题，请帮助我解决这个问题，提前谢谢你！

起初我认为这是实例化的问题，它根本没有实例化卡片，但现在我不太确定问题出在哪里。

Answer 1

你必须在这样的等待时间后调用销毁

public IEnumerator TimeDelay(){    
    yield return new WaitForSeconds(0.5f);
    Destroy(obj);
}

和其他提示：销毁方法包含延迟参数

Destroy(obj,0.5f);

https://docs.unity3d.com/ScriptReference/Object.Destroy.html

Answer 2

销毁是独立于协程发生的。当您启动协同程序时，您将程序“拆分”为两个分支。目前你的第一个分支只打开半秒钟的闹钟，而你的另一个分支删除你的对象。

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

public class CardMasterScript : MonoBehaviour
{
    public GameObject[] CardArray = new GameObject[8];
    public float RollNumber;

    public void RollCard()
    {
        RollNumber = Random.Range(0.1f, 100);

        Debug.Log("Number Rolled: " + RollNumber);

        if(RollNumber <= 47.9)
        {
            var card = Instantiate(CardArray[0]);
            StartCoroutine(TimeDelay());
        } else if(RollNumber > 47.9 && RollNumber <= 77.9)
        {
            var card = Instantiate(CardArray[1]);
            StartCoroutine(TimeDelay());
        } else if( RollNumber > 77.9 && RollNumber <= 87.9)
        {
            var card = Instantiate(CardArray[2]);
            StartCoroutine(TimeDelay());
        } else if(RollNumber > 87.9 && RollNumber <= 94.9)
        {
            var card = Instantiate(CardArray[3]);
            StartCoroutine(TimeDelay());
        } else if(RollNumber > 94.9 && RollNumber <= 97.9)
        {
            var card = Instantiate(CardArray[4]);
            StartCoroutine(TimeDelay());
        } else if(RollNumber > 97.9 && RollNumber <= 99.4)
        {
            var card = Instantiate(CardArray[5]);
            StartCoroutine(TimeDelay());
        } else if(RollNumber > 99.4 && RollNumber <= 99.9)
        {
            var card = Instantiate(CardArray[6]);
            StartCoroutine(TimeDelay());
        } else if (RollNumber > 99.9 && RollNumber <= 100)
        {
            var card = Instantiate(CardArray[7]);
            StartCoroutine(TimeDelay());
        }
    }
    
    public IEnumerator TimeDelay()
    {
        yield return new WaitForSeconds(0.5f);
        Destroy(card);
    }
}

在您的情况下，实际上并不需要使用协程，因为 Destroy 方法具有内置延迟参数。

简化您的代码可能如下所示：

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

public class CardMasterScript : MonoBehaviour
{
    public GameObject[] CardArray = new GameObject[8];
    public float RollNumber;

    public void RollCard()
    {
        RollNumber = Random.Range(0.1f, 100);

        Debug.Log("Number Rolled: " + RollNumber);

        if(RollNumber <= 47.9)
        {
            var card = Instantiate(CardArray[0]);
        } else if(RollNumber > 47.9 && RollNumber <= 77.9)
        {
            var card = Instantiate(CardArray[1]);
        } else if( RollNumber > 77.9 && RollNumber <= 87.9)
        {
            var card = Instantiate(CardArray[2]);
        } else if(RollNumber > 87.9 && RollNumber <= 94.9)
        {
            var card = Instantiate(CardArray[3]);
        } else if(RollNumber > 94.9 && RollNumber <= 97.9)
        {
            var card = Instantiate(CardArray[4]);
        } else if(RollNumber > 97.9 && RollNumber <= 99.4)
        {
            var card = Instantiate(CardArray[5]);
        } else if(RollNumber > 99.4 && RollNumber <= 99.9)
        {
            var card = Instantiate(CardArray[6]);
        } else
        {
            var card = Instantiate(CardArray[7]);
        }
        Destroy(card, 0.5f);
    }
}

Answer 3

在Quick方式中，在Destroy方法的第二个参数中输入延迟值就足够了。

Destroy(card, .5f); // Delay Time

第二种方法是将函数本身写在Coroutine 中。因为延迟时间不是在协程外执行的。

private IEnumerator DelayRun(GameObject gameObject)
{
    yield return new WaitForSeconds(.5f);
    
    Destroy(gameObject);
}

第三种方式是指定一个延迟时间的动作，它允许你在延迟后执行任何命令。只要确保您使用System 库即可。

using System;

...

void Start()
{
    StartCoroutine(DelayRun(.5f, () => Destroy(card)));
}

private IEnumerator DelayRun(float delay, Action action)
{
    yield return new WaitForSeconds(delay);
    
    action.Invoke();
}