在Unity中有多种等待方式。这确实很简单，但我认为值得涵盖执行这些操作的大多数方法：
用协程和WaitForSeconds。
到目前为止，这是最简单的方法。将需要等待一段时间的所有代码放入协程函数中，然后可以使用WaitForSeconds。请注意，在协程函数中，您可以使用调用该函数StartCoroutine(yourFunction)。
下面的示例将旋转90度，等待4秒钟，旋转40度，等待2秒钟，然后最终旋转20度。
void Start()
{
StartCoroutine(waiter());
}
IEnumerator waiter()
{
//Rotate 90 deg
transform.Rotate(new Vector3(90, 0, 0), Space.World);
//Wait for 4 seconds
yield return new WaitForSeconds(4);
//Rotate 40 deg
transform.Rotate(new Vector3(40, 0, 0), Space.World);
//Wait for 2 seconds
yield return new WaitForSeconds(2);
//Rotate 20 deg
transform.Rotate(new Vector3(20, 0, 0), Space.World);
}
之间唯一的区别WaitForSeconds和WaitForSecondsRealtime是WaitForSecondsRealtime为使用非标度的时间来等待，这意味着暂停了比赛的时候Time.timeScale，该WaitForSecondsRealtime功能将不会受到影响，但WaitForSeconds会。
void Start()
{
StartCoroutine(waiter());
}
IEnumerator waiter()
{
//Rotate 90 deg
transform.Rotate(new Vector3(90, 0, 0), Space.World);
//Wait for 4 seconds
yield return new WaitForSecondsRealtime(4);
//Rotate 40 deg
transform.Rotate(new Vector3(40, 0, 0), Space.World);
//Wait for 2 seconds
yield return new WaitForSecondsRealtime(2);
//Rotate 20 deg
transform.Rotate(new Vector3(20, 0, 0), Space.World);
}
使用协程，并使用每帧增加一个变量Time.deltaTime。
一个很好的例子是，当您需要计时器在屏幕上显示它等待了多少时间时。基本上像一个计时器。
当您希望使用boolean真变量来中断等待/睡眠时，这也很好。这是yield break;可以使用的地方。
bool quit = false;
void Start()
{
StartCoroutine(waiter());
}
IEnumerator waiter()
{
float counter = 0;
//Rotate 90 deg
transform.Rotate(new Vector3(90, 0, 0), Space.World);
//Wait for 4 seconds
float waitTime = 4;
while (counter < waitTime)
{
//Increment Timer until counter >= waitTime
counter += Time.deltaTime;
Debug.Log("We have waited for: " + counter + " seconds");
//Wait for a frame so that Unity doesn't freeze
//Check if we want to quit this function
if (quit)
{
//Quit function
yield break;
}
yield return null;
}
//Rotate 40 deg
transform.Rotate(new Vector3(40, 0, 0), Space.World);
//Wait for 2 seconds
waitTime = 2;
//Reset counter
counter = 0;
while (counter < waitTime)
{
//Increment Timer until counter >= waitTime
counter += Time.deltaTime;
Debug.Log("We have waited for: " + counter + " seconds");
//Check if we want to quit this function
if (quit)
{
//Quit function
yield break;
}
//Wait for a frame so that Unity doesn't freeze
yield return null;
}
//Rotate 20 deg
transform.Rotate(new Vector3(20, 0, 0), Space.World);
}
您仍然可以通过将while循环移到另一个协程函数并产生它来简化此过程，并且仍然可以看到它的计数甚至中断计数器。
bool quit = false;
void Start()
{
StartCoroutine(waiter());
}
IEnumerator waiter()
{
//Rotate 90 deg
transform.Rotate(new Vector3(90, 0, 0), Space.World);
//Wait for 4 seconds
float waitTime = 4;
yield return wait(waitTime);
//Rotate 40 deg
transform.Rotate(new Vector3(40, 0, 0), Space.World);
//Wait for 2 seconds
waitTime = 2;
yield return wait(waitTime);
//Rotate 20 deg
transform.Rotate(new Vector3(20, 0, 0), Space.World);
}
IEnumerator wait(float waitTime)
{
float counter = 0;
while (counter < waitTime)
{
//Increment Timer until counter >= waitTime
counter += Time.deltaTime;
Debug.Log("We have waited for: " + counter + " seconds");
if (quit)
{
//Quit function
yield break;
}
//Wait for a frame so that Unity doesn't freeze
yield return null;
}
}
：
等到条件变为true。一个示例是一个函数，它等待玩家的分数被100加载，然后加载下一个级别。
float playerscore = 0;
int nextScene = 0;
void Start()
{
StartCoroutine(sceneLoader());
}
IEnumerator sceneLoader()
{
Debug.Log("Waiting for Player score to be >=100 ");
yield return new WaitUntil(() => playerscore >= 10);
Debug.Log("Player score is >=100. Loading next Leve");
//Increment and Load next scene
nextScene++;
SceneManager.LoadScene(nextScene);
}
void Start()
{
StartCoroutine(inputWaiter());
}
IEnumerator inputWaiter()
{
Debug.Log("Waiting for the Exit button to be pressed");
yield return new WaitWhile(() => !Input.GetKeyDown(KeyCode.Escape));
Debug.Log("Exit button has been pressed. Leaving Application");
//Exit program
Quit();
}
void Quit()
{
#if UNITY_EDITOR
UnityEditor.EditorApplication.isPlaying = false;
#else
Application.Quit();
#endif
}
您将来可以调用告诉Unity来调用函数。调用该Invoke函数时，您可以传递时间等待将该函数调用为其第二个参数。下面的示例将FeedDog()在5秒Invoke被调用后调用该函数。
void Start()
{
Invoke("FeedDog", 5);
Debug.Log("Will Feed dog after 5 seconds");
}
void FeedDog()
{
Debug.Log("Now Feeding Dog");
}
，Update()具有和功能Time.deltaTime。
就像 除了不使用协程。它使用该Update功能。
问题在于它需要太多的变量，因此它不会每次都运行，而是在等待后计时器结束时仅运行一次。
float timer = 0;
bool timerReached = false;
void Update()
{
if (!timerReached)
timer += Time.deltaTime;
if (!timerReached && timer > 5)
{
Debug.Log("Done waiting");
FeedDog();
//Set to false so that We don't run this again
timerReached = true;
}
}
void FeedDog()
{
Debug.Log("Now Feeding Dog");
}
在Unity中还有其他等待方式，但是您一定应该知道上面提到的方法，因为这样可以更轻松地在Unity中制作游戏。何时使用每个视情况而定。
对于您的特定问题，这是解决方案：
IEnumerator showTextFuntion()
{
TextUI.text = "Welcome to Number Wizard!";
yield return new WaitForSeconds(3f);
TextUI.text = ("The highest number you can pick is " + max);
yield return new WaitForSeconds(3f);
TextUI.text = ("The lowest number you can pick is " + min);
}
StartCoroutine (showTextFuntion());
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