Stateパターン練習(Player)

using UnityEngine;
using UnityEngine.UI;
using System;


public abstract class PlayerBase : MonoBehaviour
{
	protected StateBase nowState;

	public abstract void ModifyState (StateBase state);

	public abstract void Move (Vector3 nextPosition);

	public abstract Vector3 GetPosition ();
}


using UnityEngine;
using UnityEngine.UI;
using System;

public class Player : PlayerBase
{
	public Player ()
	{
		ModifyState (new WanderState (this));
	}

	void Update ()
	{
		nowState.Update ();
	}

	public override void ModifyState (StateBase state)
	{
		if (nowState != null) {
			nowState.Delete ();
		}
		this.nowState = state;
	}

	void  OnTriggerEnter (Collider other)
	{
		nowState.FindOther (other);
	}

	void  OnTriggerExit (Collider other)
	{
		nowState.LostOther (other);
	}

	public override void Move (Vector3 nextPosition)
	{
		transform.position = nextPosition;
	}

	public override Vector3 GetPosition ()
	{
		return transform.position;
	}

}

Stateパターン練習(State)

using UnityEngine;
using UnityEngine.UI;
using System;

//Stateのintereface
public abstract class StateBase
{
	protected PlayerBase player;

	public StateBase (PlayerBase player)
	{
		this.player = player;
	}

	public abstract void Update ();

	public abstract void FindOther (Collider other);

	public abstract void LostOther (Collider other);

	public abstract void Delete ();
}

public class FollowState : StateBase
{
	Transform target;

	public FollowState (PlayerBase player, Transform target) : base (player)
	{
		this.target = target;
	}

	public override void Update ()
	{
		Debug.Log ("追いかけてるよ!");
		var position = this.player.GetPosition ();
		position = Vector3.Lerp (position, target.position, 0.01f);
		this.player.Move (position);
	}

	public override void FindOther (Collider other)
	{
		target = other.gameObject.transform;
	}

	public override void LostOther (Collider other)
	{
		//見失ったらさまよう
		this.player.ModifyState (new WanderState (this.player));
	}

	public override void Delete ()
	{
		Debug.Log ("追跡を終了する");
	}
}

public class WanderState : StateBase
{
	public WanderState (PlayerBase player) : base (player)
	{
		
	}

	public override void Update ()
	{
		Debug.Log ("さまよっているよ!");
		var position = this.player.GetPosition ();
		position.x += 0.1f;
		this.player.Move (position);
	}

	public override void FindOther (Collider other)
	{
		//誰かを発見したら追いかける
		this.player.ModifyState (new FollowState (this.player, other.gameObject.transform));
	}

	public override void LostOther (Collider other)
	{

	}

	public override void Delete ()
	{
		Debug.Log ("さまようのを終了する");
	}
}