StateMonoBehaviour.cs

using UnityEngine;
using System.Collections;

public class StateMonoBehaviour : MonoBehaviour
{
    public delegate IEnumerator StateMethod();
    public StateMethod state { get; private set; }
    public StateMethod lastState { get; private set; }
    public string stateName { get; private set; }
    public string lastStateName { get; private set; }

    public void SetState(StateMethod stateMethod)
    {
        if (stateMethod != state)
        {
            //if (gameObject.GetComponent<Player>() != null)
            //  Debug.LogWarning("setting state: " + stateMethod.Method.Name);

            StopAllCoroutines();

            lastStateName = stateName;
            stateName = stateMethod.Method.Name;

            //Debug.LogWarning("SetState: " + stateName);

            lastState = state;
            state = stateMethod;

            StartCoroutine(DoSetState());
        }
    }

    void OnEnable()
    {
        //if (state != null)
        //  SetState(state);
    }

    void OnDisable()
    {
        StopAllCoroutines();
        state = null;
    }

    IEnumerator DoSetState()
    {
        yield return null;
        StartCoroutine(state());
    }

    public void InvokeState(StateMethod stateMethod, float time)
    {
        StartCoroutine(DoInvokeState(stateMethod, time));
    }

    IEnumerator DoInvokeState(StateMethod stateMethod, float time)
    {
        yield return new WaitForSeconds(time);
        SetState(stateMethod);
    }
}