Unity Coroutine -> Callback

YieldReturnExtension.cs

/*
 * https://gist.github.com/johnsoncodehk/17f05ebbeb1b7966efc4d5a176dd0bd8
 */

using UnityEngine;
using System;
using System.Collections;

public static class YieldReturnExtension
{

    public static Coroutine YieldReturn<T>(this MonoBehaviour mb, T t, Action onYield, int loopTimes = 1, bool callbackLast = false)
    {
        return mb.YieldReturn(() => t, onYield, loopTimes, callbackLast);
    }
    public static Coroutine YieldReturn<T>(this MonoBehaviour mb, T t, Action<T> onYield, int loopTimes = 1, bool callbackLast = false)
    {
        return mb.YieldReturn(() => t, onYield, loopTimes, callbackLast);
    }
    public static Coroutine YieldReturn<T>(this MonoBehaviour mb, Func<T> getT, Action onYield, int loopTimes = 1, bool callbackLast = false)
    {
        return mb.StartCoroutine(YieldReturnAsync(getT, t2 => onYield(), loopTimes, callbackLast));
    }
    public static Coroutine YieldReturn<T>(this MonoBehaviour mb, Func<T> getT, Action<T> onYield, int loopTimes = 1, bool callbackLast = false)
    {
        return mb.StartCoroutine(YieldReturnAsync(getT, onYield, loopTimes, callbackLast));
    }

    private static IEnumerator YieldReturnAsync<T>(Func<T> getT, Action<T> onYield, int loopTimes, bool callbackLast)
    {
        while (loopTimes > 0)
        {
            T t = getT();
            yield return t;
            loopTimes--;
            if (!callbackLast || loopTimes == 0)
            {
                onYield(t);
            }
        }
    }
}

YieldReturnExtensionMin.cs

/*
 * https://gist.github.com/johnsoncodehk/17f05ebbeb1b7966efc4d5a176dd0bd8
 */

using UnityEngine;
using System;
using System.Collections;

public static class YieldReturnExtension
{
    public static Coroutine YieldReturn<T>(this MonoBehaviour mb, T t, Action onYield)
    {
        return mb.StartCoroutine(YieldReturnAsync(t, t2 => onYield()));
    }
    public static Coroutine YieldReturn<T>(this MonoBehaviour mb, T t, Action<T> onYield)
    {
        return mb.StartCoroutine(YieldReturnAsync(t, onYield));
    }
    static IEnumerator YieldReturnAsync<T>(T t, Action<T> onYield)
    {
        yield return t;
        onYield(t);
    }
}