Unity控制指针旋转到指定位置

using UnityEngine;
using System.Collections;
 
public class Test_OnDashboard : MonoBehaviour
{
 public int thiAngle = 0;
 public int rotateSpeed = 2;
 public bool openRotate = false;
 
 
 // Use this for initialization
 void Start ()
 {
 
 }
 
 // Update is called once per frame
 void Update ()
 {
 if (Input.GetKeyDown(KeyCode.T))
 {
  openRotate = true;
  StartCoroutine(stop());
 }
 
 
 if (openRotate)
 {
  PointerRotate();
 
 }
 
 }
 
 /// <summary>
 /// 控制指针旋转
 /// </summary>
 private void PointerRotate()
 {
 if (thiAngle > -0.001f && thiAngle <= 180)
 {
  Quaternion target = Quaternion.Euler(0, 0, (90 - thiAngle));
  transform.rotation = Quaternion.RotateTowards(transform.rotation, target, rotateSpeed);
 }
 
 
 
 }
 
 /// <summary>
 /// 停止检测
 /// </summary>
 /// <returns></returns>
 private IEnumerator stop()
 {
 yield return new WaitForSeconds(2);
 openRotate =false;
 Debug.Log("tingzhi");
 }
 
}