点击NPC改变鼠标图标

基类：

using UnityEngine;
using System.Collections;

public class CommonNPC : MonoBehaviour {

	// Use this for initialization
	void Start () {

	}

	// Update is called once per frame
	void Update () {

	}

    void OnMouseEnter()
    {
        MouseCursor._instance.SetCursorDialog();
    }
    void OnMouseExit()
    {
        MouseCursor._instance.SetCursorHand();
    }
}

子类：

using UnityEngine;
using System.Collections;

public class NPCTask : CommonNPC
{
    public TweenPosition TweenPos;
    public GameObject ConfirmButton;
    public GameObject CancelButton;
    public GameObject FinishButton;
    public UILabel Label;
    public int KilledAnimals;
    private bool IsTasking;
	// Use this for initialization
	void Start () {
        IsTasking = false;
        KilledAnimals = 0;
        FinishButton.SetActive(false);
	}

	void OnMouseOver()
    {
        if (Input.GetMouseButtonDown(0))
        {
            TweenPos.gameObject.SetActive(true);
            TweenPos.PlayForward();
            if(IsTasking==false)//接收任务
            {
                Label.text = "任务：杀死10个动物\n奖励:1000金币" ;
                FinishButton.SetActive(false);
                ConfirmButton.SetActive(true);
                CancelButton.SetActive(true);
            }
            else//提交任务
            {
                Label.text = "已经杀死" + KilledAnimals + "个动物";
                FinishButton.SetActive(false);
                ConfirmButton.SetActive(true);
                CancelButton.SetActive(true);
            }

        }
    }
    public void OnClickConfirm()//接收任务
    {
        Label.text = "已经杀死" + KilledAnimals + "个动物";
        FinishButton.SetActive(false);
        ConfirmButton.SetActive(true);
        CancelButton.SetActive(true);
        IsTasking = true;
    }
    public void OnClickCancel()
    {
        TweenPos.PlayReverse();
    }
    public void OnClickFinish()//提交任务
    {
        if(KilledAnimals>=10)
        {
            //
        }
    }

	// Update is called once per frame
	void Update () {

	}
}