UGUI Text文字左右循环运动

using UnityEngine;
using System.Collections;

public class MoveTarget : MonoBehaviour
{
    public GameObject _target1;//左侧目标位置
    public GameObject _target2;//右侧目标位置
    bool _check = true;
    bool _check2 = true;
    void Start()
    {
        StartCoroutine(IE_MoveToLeft());
    }

    IEnumerator IE_MoveToLeft()
    {
        while (_check)
        {
            transform.localPosition=Vector2.MoveTowards(transform.localPosition,_target1.transform.localPosition,Time.deltaTime*50f);
           // transform.Translate(Vector3.left, Space.Self);
            if (Mathf.Abs(_target1.transform.localPosition.x - transform.localPosition.x) < 0.2f)
            {
                _check = false;
                _check2 = true;
                StartCoroutine(IE_MoveToRight());
            }
            yield return null;
        }
    }

    IEnumerator IE_MoveToRight()
    {
        while (_check2)
        {
            transform.localPosition = Vector2.MoveTowards(transform.localPosition, _target2.transform.localPosition, Time.deltaTime * 50f);
            // transform.Translate(Vector3.left, Space.Self);
            if (Mathf.Abs(_target2.transform.localPosition.x - transform.localPosition.x) < 0.2f)
            {
                _check2 = false;
                _check = true;
                StartCoroutine(IE_MoveToLeft());
            }
            yield return null;
        }
    }
}