unity 背景图 跑起来

using UnityEngine; using System.Collections; using UnityEngine.UI; using System;

public class BackgroundController : MonoBehaviour {     public Text text;     public Image back1;     public Image back2;

    public int speed = 10;                   //背景平移的速度     public Transform endPosition;           //到达该位置,把背景移动到开始位置     public Transform startPosition;         //背景从开始位置移动到结束位置

    private int backIndex;

    void Start()     {            }     float TimeNum = 0;     void Update()     {         TimeNum += Time.deltaTime;         if (TimeNum>=1)         {             text.text = "HP:" + tt();             TimeNum = 0;         }         //两个图片的平移         back1.transform.position = new Vector3(back1.transform.position.x - speed * Time.deltaTime, back1.transform.position.y, back1.transform.position.z);         back2.transform.position = new Vector3(back2.transform.position.x - speed * Time.deltaTime, back2.transform.position.y, back2.transform.position.z);

        //到达结束位置,回到开始位置,切换图片         if (back1.transform.position.x