public class StateMachine : MonoBehaviour


private IState currentlyRunningState;

private IState PreviousState;

public void ChangeState(IState newState)
{
    if (currentlyRunningState != null)
    {
        currentlyRunningState.Exit();
    }

    PreviousState = currentlyRunningState;

    currentlyRunningState = newState;

    currentlyRunningState.Enter();
}

public void ExecuteStateUpdate()
{

    var runningState = this.currentlyRunningState;

    if (runningState != null)
    {
        runningState.Execute();
    }
}
public void SwitchToPreviousState()
{
    this.currentlyRunningState.Exit();

    this.currentlyRunningState = this.PreviousState;

    this.currentlyRunningState.Enter();

}

public interface IState

void Enter();

void Execute();
void Exit();

public class SearchFor : IState

LayerMask SearchLayer;
GameObject OwnerGameObject;
private float SearchRadius;
private string TagForSearch;
private NavMeshAgent NavMeshAgentForSearch;

public bool SearchComplated;

private System.Action<SearchResult> SearchResultCallBack;

public SearchFor(LayerMask searchlayer, GameObject owner, float searchradios, string tagforsearch, NavMeshAgent navmeshagent, System.Action<SearchResult>
    searchresultcallback)
{
    SearchLayer = searchlayer;
    OwnerGameObject = owner;
    SearchRadius = searchradios;
    TagForSearch = tagforsearch;
    NavMeshAgentForSearch = navmeshagent;
    SearchResultCallBack = searchresultcallback;
}
public void Enter()
{

}
public void Execute()
{
    var HitObjects = Physics.OverlapSphere(OwnerGameObject.transform.position, SearchRadius);
    var AllObjectsWithRequaredTag = new List<Collider>();

    for (int i = 0; i < HitObjects.Length; i++)
    {
        if (HitObjects[i].CompareTag(TagForSearch))
        {
            this.NavMeshAgentForSearch.SetDestination(HitObjects[i].transform.position);
            AllObjectsWithRequaredTag.Add(HitObjects[i]);

        }
    }
    var SearchResult = new SearchResult(HitObjects, AllObjectsWithRequaredTag);

    SearchResultCallBack(SearchResult);
}
public void Exit()
{

}

public List<Collider> AllHitObjectsInRequaredTag;

public SearchResult(Collider[] allhitobjectsinseardrad, List<Collider> allhitobjectsinreqtag)
{
    AllhitObjectInSearchRadius = allhitobjectsinseardrad;
    AllHitObjectsInRequaredTag = allhitobjectsinreqtag;
}

public class CubePlayer : MonoBehaviour

private StateMachine stateMachine = new StateMachine();

[SerializeField]
private LayerMask foodItems;
[SerializeField]
private float ViewRadius;
[SerializeField]
private string FoodItemsTag;
//private SearchFor searchForFood;
private NavMeshAgent navMeshAgent;

public bool SwithState = false;

private void Start()
{
    this.navMeshAgent = GetComponent<NavMeshAgent>();

    // Изменение стадии на поиск чего-либо
    stateMachine.ChangeState(new SearchFor(foodItems, this.gameObject, ViewRadius, tag, navMeshAgent, FoodFound));
}
private void Update()
{
    // Выполняет стадию
    stateMachine.ExecuteStateUpdate();

}

public void FoodFound(SearchResult searchResult)
{
    var FoundItemsFood = searchResult.AllHitObjectsInRequaredTag;

}

public void EatFood()
{

}