协程

描述

MonoBehaviour.StartCoroutine 返回一个协程。此类实例仅用于引用这些协程，并且不包含任何公开的属性或函数。

协程是一个可以暂停其执行（yield）直到给定的 YieldInstruction 完成的函数。

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    IEnumerator WaitAndPrint()
    {
        // suspend execution for 5 seconds
        yield return new WaitForSeconds(5);
        print("WaitAndPrint " + Time.time);
    }

    IEnumerator Start()
    {
        print("Starting " + Time.time);

        // Start function WaitAndPrint as a coroutine
        yield return StartCoroutine("WaitAndPrint");
        print("Done " + Time.time);
    }
}

此示例显示了正常的 Start

using UnityEngine;
using System.Collections;

// In this example we show how to invoke a coroutine and execute
// the function in parallel.  Start does not need IEnumerator.

public class ExampleClass : MonoBehaviour
{
    private IEnumerator coroutine;

    void Start()
    {
        // - After 0 seconds, prints "Starting 0.0 seconds"
        // - After 0 seconds, prints "Coroutine started"
        // - After 2 seconds, prints "Coroutine ended: 2.0 seconds"
        print("Starting " + Time.time + " seconds");

        // Start function WaitAndPrint as a coroutine.

        coroutine = WaitAndPrint(2.0f);
        StartCoroutine(coroutine);

        print("Coroutine started");
    }

    private IEnumerator WaitAndPrint(float waitTime)
    {
        yield return new WaitForSeconds(waitTime);
        print("Coroutine ended: " + Time.time + " seconds");
    }
}

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