防止玩家在C#(Unity)中滥发密钥

Question

我目前正在用unity的代码学习教程，在这一节中有一些额外的挑战，这些挑战对你解决问题没有帮助。它说我必须防止玩家滥发空格键来繁殖狗。我是C#的新手，我开始在网上搜索，但我看到了一些关于CoRoutines的东西，我仍然不知道那是什么，有没有一个简单的方法可以做到这一点，在网上搜索我发现了这样的东西，但我无法使其工作。我也试着做一些条件，比如canSpawn，但我不知道如何很好地实现它，Unity给了我一个错误，我不能使用&amp；在bool和按键事件之间

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerControllerX : MonoBehaviour
{
public GameObject dogPrefab;
public float time = 2.0f;
public float timer = Time.time;
// Update is called once per frame
void Update()
{
timer -= Time.deltaTime;
if (timer > time)
{
// On spacebar press, send dog
if (Input.GetKeyDown(KeyCode.Space))
{
spawnDog();
}
timer = time;
}
void spawnDog()
{
Instantiate(dogPrefab, transform.position, dogPrefab.transform.rotation);
}
}

Answer 1

你很接近。有一件事可能会更容易理解逻辑，那就是只向上计数，而不是试图向下计数。因此，在您的情况下，代码看起来是这样的：

void Update ( )
{
timer += Time.deltaTime;
if ( timer >= time )
{
if ( Input.GetKeyDown ( KeyCode.Space ) )
{
spawnDog ( );
timer = 0;
}
}
}
void spawnDog ( )
{
Instantiate ( dogPrefab, transform.position, dogPrefab.transform.rotation );
}

timer一直被添加到，当它大于time的值(在本例中为2.0f(时，它允许您按键IF然后按下一个键，timer重置为0，玩家需要等待time时间(2.0f(才能再次按下空格键。

Answer 2

我在这个任务中使用了Coroutines，它有更多的代码，但它运行得很好。

public class PlayerControllerX : MonoBehaviour
{
public GameObject dogPrefab;
private bool isCoolDown = false;
private float coolDown = 1f;
private void Update( )
{
if (Input.GetKeyDown(KeyCode.Space))
{
if (isCoolDown == false)
{
SpawnDog( );
StartCoroutine(CoolDown( ));
}
}
}
IEnumerator CoolDown( )
{
isCoolDown = true;
yield return new WaitForSeconds(coolDown);
isCoolDown = false;
}
private void SpawnDog( )
{
Instantiated(dogPrefab, transform.position, dogPrefab.transform.rotation);
}
}       

Answer 3

我正在使用我的手机。如果我犯了一些语法错误，我很抱歉。

bool isReadyForInstantiate;
void Start(){
isReadyForInstantiate = true;
}
void Update(){
if(isReadyForInstantiate && Input.GetKeyDown(KeyCode.Space)){
StartCoroutine(PreventSpam());
Instantiate(dogPrefab, transform.position, Quaternion.identity);
}
}
IEnumerator PreventSpam(){
isReadyForInstantiate = false;
yield return new WaitForSeconds(2);
isReadyForInstantiate = true;
}

Answer 4

这里是我基于StopWatch的解决方案：

using UnityEngine;
using System.Diagnostics; // hides UnityEngine.Debug. if needed use qualified call
public class PlayerControllerX : MonoBehaviour
{
public GameObject dogPrefab;
public double dogDelayMillis = 2000d;
private Stopwatch stopWatch;
private void Start()
{
stopWatch = new Stopwatch();
}
private void Update()
{
if (Input.GetKeyDown(KeyCode.Space))
{
if (stopWatch.IsRunning)
{
if (stopWatch.Elapsed.TotalMilliseconds > dogDelayMillis)
{
stopWatch.Reset();
SpawnDog();
}
}
else
{
SpawnDog();
}
}
}
private void SpawnDog()
{
stopWatch.Start();
Instantiate(dogPrefab, transform.position, dogPrefab.transform.rotation);
}
}

Answer 5

另一个有趣的示例

public GameObject dogPrefab;
[Range(0f,2f)]
private float timer = 1.0f;
private float waitTime = 1.0f;
// Update is called once per frame
void Update()
{
// Delay Input Timer - only execute the spacebar command if timer has caught up with waitTime
if (timer < waitTime)
{}
// On spacebar press, send dog
else if (Input.GetKeyDown(KeyCode.Space))
{
Instantiate(dogPrefab, transform.position, dogPrefab.transform.rotation);
// Resets Timer
timer = 0;
}
// Run Timer every frame
timer += Time.deltaTime;
Debug.Log(timer);
}

}

Answer 6

我陷入了同样的困境，谢谢。下面的代码是我选择的，因为它又短又甜。

public GameObject dogPrefab;
[Range(0f,2f)]
private float timer = 1.0f;
private float waitTime = 1.0f;
// Update is called once per frame
void Update()
{
// Delay Input Timer - only execute the spacebar command if timer has caught up with waitTime
if (timer < waitTime)
{}
// On spacebar press, send dog
else if (Input.GetKeyDown(KeyCode.Space))
{
Instantiate(dogPrefab, transform.position, dogPrefab.transform.rotation);
// Resets Timer
timer = 0;
}
// Run Timer every frame
timer += Time.deltaTime;
Debug.Log(timer);
}

}