はじめに

「Unity Coroutines Without MonoBehaviours」を Unity プロジェクトに導入することで
MonoBehaviour を使用せずにコルーチンを実行できるようになります

使用例

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TestRunner : MonoBehaviour
{
    private AsyncProcessor m_processor;

    public void Start()
    {
        m_processor = new AsyncProcessor();
        m_processor.Process( Coroutine1() );
        m_processor.Process( GetExample1() );
        m_processor.Process( GetExample2() );
    }

    private IEnumerator Coroutine1()
    {
        yield return WaitABit();
    }

    private IEnumerator WaitABit()
    {
        var start = Time.realtimeSinceStartup;

        while ( Time.realtimeSinceStartup - start < 2 )
        {
            yield return null;
        }
    }

    private IEnumerator GetExample1()
    {
        yield return SlowLookup();
    }

    private IEnumerator<string> SlowLookup()
    {
        var start = Time.realtimeSinceStartup;

        while ( Time.realtimeSinceStartup - start < 2 )
        {
            yield return null;
        }

        yield return "return value string";
    }

    private IEnumerator GetExample2()
    {
        var stringValue = SlowLookup2();
        yield return stringValue;
    }

    private IEnumerator<string> SlowLookup2()
    {
        return CoRoutineUtil.Wrap<string>( SlowLookup2Impl() );
    }

    private IEnumerator SlowLookup2Impl()
    {
        yield return WaitABit();
        yield return WaitABit();
        yield return WaitABit();
        yield return "returned string value";
    }

    private void Update()
    {
        m_processor.Tick();
    }
}