有输入时如何启动计时器？

Question

在我的游戏中，我希望在用户左键单击时启动计时器。这是我到目前为止的代码：

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

public class Countdown : MonoBehaviour
{
    float timeLeft = 30.0f;
    public Text text;
    public Text scoretext;
    public Text finalscore;
    public AudioSource ping;
    public GameObject ball;
    // Use this for initialization
    void Start ()
    {
        finalscore.text = "";        
    }

    void countdownfunction()
    {
        timeLeft -= Time.deltaTime;
        text.text = "Time Left: " + Mathf.Round(timeLeft) + " seconds";
    }

    // Update is called once per frame
    void Update ()
    {
        countdownfunction();

        if (timeLeft < 0)
        {
            ping = GetComponent<AudioSource>();
            text.text = "Time's up!";
            ping.Play();
            ball.SetActive(false);
            finalscore.text = "Final score ^";            
        }
    }
}

如您所见，计时器会在游戏开始时立即启动，但我希望它在用户单击鼠标左键时启动，请告诉我是否有办法做到这一点，谢谢。

Answer 1

在您的更新函数中，使用 Input.GetMouseButtonDown(0) 函数检查用户是否左键单击。您的代码将如下所示：

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

public class Countdown : MonoBehaviour
{
    float timeLeft = 30.0f;
    public Text text;
    public Text scoretext;
    public Text finalscore;
    public AudioSource ping;
    public GameObject ball;
    bool timerStarted = false;
    // Use this for initialization
    void Start ()
    {
        finalscore.text = "";        
    }

    void countdownfunction()
    {
        timeLeft -= Time.deltaTime;
        text.text = "Time Left: " + Mathf.Round(timeLeft) + " seconds";
    }

    // Update is called once per frame
    void Update ()
    {
        if(Input.GetMouseButtonDown(0))
            timerStarted = true;
        if(timerStarted)
            countdownfunction();

        if (timeLeft < 0)
        {
            ping = GetComponent<AudioSource>();
            text.text = "Time's up!";
            ping.Play();
            ball.SetActive(false);
            finalscore.text = "Final score ^";            
        }
    }
}

Answer 2

最好将计时器与更新功能分开。制作成另一个功能。协程非常适合这类事情，因为您可以轻松地使用它等待一段时间然后恢复操作。此外，如果您要多次使用它们，请缓存组件。您将经常使用 ping 变量，因此在 Awake 或 Start 函数中缓存是有意义的。

void Start()
{
    finalscore.text = "";
    ping = GetComponent<AudioSource>();
}

void Update()
{
    //Check if left mouse button is clicked
    if (Input.GetMouseButton(0))
    {
        StartCoroutine(startTimer(30));
    }
}

IEnumerator startTimer(float timeLeft)
{
    while (timeLeft > 0)
    {
        timeLeft -= Time.deltaTime;
        text.text = "Time Left: " + Mathf.Round(timeLeft) + " seconds";
        yield return null;
    }

    text.text = "Time's up!";
    ping.Play();
    ball.SetActive(false);
    finalscore.text = "Final score ^";
}

Answer 3

您需要使用 onMouseDown 事件

将以下内容添加到您现有的代码中：创建一个布尔变量，将其设置为 false，将其设置为 true onMouseDown 并仅在将其设置为 true 时才启动计时器：

private bool mouseClicked=false;

void OnMouseDown(){
 mouseClicked = true;
}

void Update () {

    if (mouseClicked){
        countdownfunction();
    }

    if (timeLeft < 0)
    {
        ping = GetComponent<AudioSource>();
        text.text = "Time's up!";
        ping.Play();
        ball.SetActive(false);
        finalscore.text = "Final score ^";


    }
}

有输入时如何启动计时器？

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