启动一个协同程序。
可以使用 yield 语句,随时暂停协程的执行。使用 yield 语句时,协程将暂停执行,并在下一帧自动恢复。请参阅协程文档以了解更多详细信息。协程非常适合用于在若干帧中对行为建模。协程几乎没有性能开销。StartCoroutine 函数始终立即返回,但是您可以生成结果。生成操作将等待协程完成执行。即使多个协程在同一帧中完成,也不能保证它们按照与启动相同的顺序结束。
StartCoroutine 的示例:
using UnityEngine; using System.Collections;
// In this example we show how to invoke a coroutine and // continue executing the function in parallel.
public class ExampleClass : MonoBehaviour { // In this example we show how to invoke a coroutine and // continue executing the function in parallel.
private IEnumerator coroutine;
void Start() { // - After 0 seconds, prints "Starting 0.0" // - After 0 seconds, prints "Before WaitAndPrint Finishes 0.0" // - After 2 seconds, prints "WaitAndPrint 2.0" print("Starting " + Time.time);
// Start function WaitAndPrint as a coroutine.
coroutine = WaitAndPrint(2.0f); StartCoroutine(coroutine);
print("Before WaitAndPrint Finishes " + Time.time); }
// every 2 seconds perform the print() private IEnumerator WaitAndPrint(float waitTime) { while (true) { yield return new WaitForSeconds(waitTime); print("WaitAndPrint " + Time.time); } } }
另一个示例:
// In this example we show how to invoke a coroutine and wait until it // is completed
using UnityEngine; using System.Collections;
public class ExampleClass : MonoBehaviour { IEnumerator Start() { // - After 0 seconds, prints "Starting 0.0" // - After 2 seconds, prints "WaitAndPrint 2.0" // - After 2 seconds, prints "Done 2.0" print("Starting " + Time.time);
// Start function WaitAndPrint as a coroutine. And wait until it is completed. // the same as yield WaitAndPrint(2.0); yield return StartCoroutine(WaitAndPrint(2.0F)); print("Done " + Time.time); }
// suspend execution for waitTime seconds IEnumerator WaitAndPrint(float waitTime) { yield return new WaitForSeconds(waitTime); print("WaitAndPrint " + Time.time); } }
启动一个名为 methodName
的协同程序。
在大多数情况下,您应该使用上面的 StartCoroutine 变体。 但是,使用字符串方法名称的 StartCoroutine 让您能够使用具有特定方法名称的 StopCoroutine。 缺点是字符串版本在启动协同程序时的运行时开销更高,并且您只能传递一个参数。
// In this example we show how to invoke a coroutine using a string name and stop it.
using UnityEngine; using System.Collections;
public class ExampleClass : MonoBehaviour { IEnumerator Start() { StartCoroutine("DoSomething", 2.0F); yield return new WaitForSeconds(1); StopCoroutine("DoSomething"); }
IEnumerator DoSomething(float someParameter) { while (true) { print("DoSomething Loop");
// Yield execution of this coroutine and return to the main loop until next frame yield return null; } } }
coroutine | 所创建的协同程序的名称。 |
启动一个名为 coroutine
的协同程序。
创建协程。可以使用任何协程名称。StartCoroutine 函数立即终止,然而,它创建的协程将 按预期运行。一个已创建的协程可以启动另一协程。 这两个协程能按多种方式共同运行。这包括 并行运行两个协程。或者,一个协程可以让 另一协程停止,而自己继续运行。以下脚本示例显示了 一个协程在启动另一协程时暂停。第二个协程 结束后,将重新启动第一个协程。
using System.Collections; using System.Collections.Generic; using UnityEngine;
public class ExampleClass : MonoBehaviour { void Start() { StartCoroutine(coroutineA()); }
IEnumerator coroutineA() { // wait for 1 second Debug.Log("coroutineA created"); yield return new WaitForSeconds(1.0f); yield return StartCoroutine(coroutineB()); Debug.Log("coroutineA running again"); }
IEnumerator coroutineB() { Debug.Log("coroutineB created"); yield return new WaitForSeconds(2.5f); Debug.Log("coroutineB enables coroutineA to run"); } }
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