跳转界面加载 进度条

using UnityEngine;using System.Collections;using UnityEngine.UI;public class LoadingScripts : MonoBehaviour{    public GameObject objProcessBar;    public Text baifenbi;    // Use this for initialization    void Start()    {        StartCoroutine(StartLoading("testScene2"));    }    IEnumerator StartLoading(string str)    {        float i = 0;        AsyncOperation acOp = Application.LoadLevelAsync(str);        acOp.allowSceneActivation = false;        while (i <= 100)        {            i++;            objProcessBar.GetComponent<Slider>().value = i / 100;                        yield return new WaitForEndOfFrame();            baifenbi.text = i.ToString() + "%";        }        acOp.allowSceneActivation = true;    }}