blocks|key|4113393|text|尝试使用协程而不是Update函数，这样您就可以随时启动和停止它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4113394|public+Text+timerText;

public+void+Start(int+seconds)
{
++++StartCoroutine("RunTimer",+seconds);
}

IEnumerator+RunTimer(int+seconds)
{
++++while+(seconds+>+0)
++++{
++++++++if+(timerText+!=+null)
++++++++{
++++++++++++timerText.text+=+seconds.ToString();
++++++++++++Debug.Log+(seconds);
++++++++}
++++++++yield+return+new+WaitForSeconds(1);
++++++++seconds+-=+1;
++++}
}|code-block|syntax|javascript|4113395|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try using a coroutine instead of Update function, that way you can start it and stop it whenever you want.

<pre><code>public Text timerText;

public void Start(int seconds)
{
 StartCoroutine("RunTimer", seconds);
}

IEnumerator RunTimer(int seconds)
{
 while (seconds &gt; 0)
 {
 if (timerText != null)
 {
 timerText.text = seconds.ToString();
 Debug.Log (seconds);
 }
 yield return new WaitForSeconds(1);
 seconds -= 1;
 }
}
</code></pre>

blocks|key|4251528|text|public+class+CountdownTimer+:+MonoBehaviour
{
++++float+seconds;
++++public+Text+timerText;

++++public+void+Update()
++++{
++++++++seconds+-=+Time.deltaTime;
++++++++if+(timerText+!=+null)
++++++++{
++++++++++++timerText.text+=+Mathf.Round(seconds).ToString();
++++++++++++Debug.Log+(Mathf.Round(seconds));
++++++++}
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4251529|首先，被激活的MonoBehaviour中的Update()方法将在每一帧中被调用(更多信息在这里：Execution+Order+of+Event+Functions)|unstyled|offset|length|style|CODE|4251530|现在，在您的脚本中有两个变量。首先是私有seconds，然后是公共timerText。为什么timerText是公开的？如果该变量未被另一个类使用，则应为private。|4251531|现在该问了；但是我该如何在编辑器中附加Text组件呢？那么，您应该使用SerializeField。|4251532|现在我认为错误是您为Text组件赋了一些值。但是，您的变量seconds默认情况下为零。(您正在声明一个不带任何值的浮点数，默认情况下它将被initialized为0f)。|4251533|因此，在第一帧中，文本组件将显示初始值，假设为15。但在第一次调用Update()时，行seconds+-=+Time.deltaTime+it将类似于seconds+=+0f+-+Time.deltaTime;，然后timerText它将被更新为这个新的almost+zero值。|4251534|你能做什么？在Update调用之前，可以使用另一个事件函数Awake为变量设置一些值。|4251535|如果你想使用timerText的值，你可以这样做：|4251536|public+class+CountdownTimer+:+MonoBehaviour
{
++++private+float+seconds;

++++[SerializeField]
++++private+Text+timerText;

++++private+void+Awake()
++++{
++++++++if+(!string.isNullOrEmpty(timerText))
++++++++{
++++++++++++seconds+=+float.Parse(timerText.text);++++++++++
++++++++}
++++}

++++//+Yep,+Event+Functions+can+be+private+and+Unity+will+`call`+them+anyways
++++private+void+Update()+
++++{
++++++++seconds+-=+Time.deltaTime;
++++++++if+(timerText+!=+null)
++++++++{
++++++++++++timerText.text+=+Mathf.Round(seconds).ToString();
++++++++++++Debug.Log+(Mathf.Round(seconds));
++++++++}
++++}
}|4251537|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.unity3d.com/Manual/ExecutionOrder.html|1|https://docs.unity3d.com/ScriptReference/SerializeField.html|2|https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/default-values-table|3|https://docs.unity3d.com/ScriptReference/MonoBehaviour.Awake.html^0|0|M|8|1E|Y|0|0|K|7|X|9|1A|9|25|7|0|J|4|Z|E|1|0|T|7|1Y|B|2A|2|2|0|N|2|X|8|18|P|24|U|31|9|3K|B|0|7|6|T|5|3|0|6|9|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|1D|8|@$G|1E|H|1F|I|J]]|9|@$G|1G|H|1H|1|1I]]|A|$]]|$1|K|3|L|5|F|7|1J|8|@$G|1K|H|1L|I|J]|$G|1M|H|1N|I|J]|$G|1O|H|1P|I|J]|$G|1Q|H|1R|I|J]]|9|@]|A|$]]|$1|M|3|N|5|F|7|1S|8|@$G|1T|H|1U|I|J]]|9|@$G|1V|H|1W|1|1X]]|A|$]]|$1|O|3|P|5|F|7|1Y|8|@$G|1Z|H|20|I|J]|$G|21|H|22|I|J]]|9|@$G|23|H|24|1|25]]|A|$]]|$1|Q|3|R|5|F|7|26|8|@$G|27|H|28|I|J]|$G|29|H|2A|I|J]|$G|2B|H|2C|I|J]|$G|2D|H|2E|I|J]|$G|2F|H|2G|I|J]|$G|2H|H|2I|I|J]]|9|@]|A|$]]|$1|S|3|T|5|F|7|2J|8|@$G|2K|H|2L|I|J]]|9|@$G|2M|H|2N|1|2O]]|A|$]]|$1|U|3|V|5|F|7|2P|8|@$G|2Q|H|2R|I|J]]|9|@]|A|$]]|$1|W|3|X|5|6|7|2S|8|@]|9|@]|A|$B|C]]|$1|Y|3|-4|5|F|7|2T|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]|16|$5|11|12|13|A|$14|17]]|18|$5|11|12|13|A|$14|19]]|1A|$5|11|12|13|A|$14|1B]]]]

<pre><code>public class CountdownTimer : MonoBehaviour
{
 float seconds;
 public Text timerText;

 public void Update()
 {
 seconds -= Time.deltaTime;
 if (timerText != null)
 {
 timerText.text = Mathf.Round(seconds).ToString();
 Debug.Log (Mathf.Round(seconds));
 }
 }
}
</code></pre>

First the <code>Update()</code> method in a MonoBehaviour that is activated it will be called every frame (More info about that here: <a href="https://docs.unity3d.com/Manual/ExecutionOrder.html" rel="nofollow noreferrer">Execution Order of Event Functions</a>)

Now, in your script you have 2 variables. First a private <code>seconds</code> and then a public <code>timerText</code>.
Why <code>timerText</code> is public? If that variable is not being used by another class should be <code>private</code>.

Now is when you ask; But how I attach a <code>Text</code> component in the editor? Well, you should use <a href="https://docs.unity3d.com/ScriptReference/SerializeField.html" rel="nofollow noreferrer">SerializeField</a> instead. 

Now I think that the error is that you are assigning some value to the Text component. But, your variable <code>seconds</code> is by default zero. (You are declaring a float without any value, by default it will be <code>initialized</code> as <a href="https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/default-values-table" rel="nofollow noreferrer">0f</a>).

So the first frame the Text component will display your initial value, let say <code>15</code>. But the first time that <code>Update()</code> is being called, the line <code>seconds -= Time.deltaTime</code> it will be something like <code>seconds = 0f - Time.deltaTime;</code>, then <code>timerText</code> it will be updated with this new <code>almost zero</code> value. 

What can you do? You can use another Event Function, <a href="https://docs.unity3d.com/ScriptReference/MonoBehaviour.Awake.html" rel="nofollow noreferrer">Awake</a> to setup your variable with some value before the <code>Update</code> calls. 

If you want to use the value of <code>timerText</code> you can do this:

<pre><code>public class CountdownTimer : MonoBehaviour
{
 private float seconds;

 [SerializeField]
 private Text timerText;

 private void Awake()
 {
 if (!string.isNullOrEmpty(timerText))
 {
 seconds = float.Parse(timerText.text); 
 }
 }

 // Yep, Event Functions can be private and Unity will `call` them anyways
 private void Update() 
 {
 seconds -= Time.deltaTime;
 if (timerText != null)
 {
 timerText.text = Mathf.Round(seconds).ToString();
 Debug.Log (Mathf.Round(seconds));
 }
 }
}
</code></pre>

Something strange is happening with my countdown timer and I'm stuck. I'm passing a number to my timer (15 seconds) which starts at 15 but then jumps to 0 and then counts down from there: 0, -1, -2, -3... What am I doing incorrectly here?

<pre><code>using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class CountdownTimer : MonoBehaviour
{
 float seconds;
 public Text timerText;

 public void Update()
 {
 seconds -= Time.deltaTime;
 if (timerText != null)
 {
 timerText.text = Mathf.Round(seconds).ToString();
 Debug.Log (Mathf.Round(seconds));
 }
 }
}
</code></pre>

I'm calling the countdown script from a function in another script like this:

<pre><code>void ShowRestartWarning()
 {
 //Debug.Log("Restart Warning Dialog");

 canvas = GameObject.FindGameObjectWithTag("Canvas");

 timerInstance = Instantiate(timeOutWarningDialog);
 timerInstance.transform.SetParent(canvas.transform, false);
 timerInstance.SetActive(true);

 CountdownTimer countdownTimer = timeOutWarningDialog.GetComponent&lt;CountdownTimer&gt;();
 countdownTimer.Update(); 

 CancelInvoke();
 Invoke("RestartGame", countdownLength); 
 }
</code></pre>

Unity countdown timer jumping to zero and counting down into negatives

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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问单位倒计时计时器跳至零并倒计时为负数
EN

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