加载进度条

using UnityEngine;
using System.Collections;

public class HHHHHHHH : MonoBehaviour {

    public GUIStyle progressbar_bj;   //背景图
    public GUIStyle progressbar_qj;   //前景图
    public GameObject obj;
    WWW www;
    bool loading=true;

    public Texture img;
    float Length=0;

    void Start () {
    StartCoroutine(ABC("http://images.earthcam.com/ec_metros/ourcams/fridays.jpg"));
    }

    // Update is called once per frame
    void Update ()
    {
        if(!www.isDone)
        {
            print(www.progress);
            loading=true;
        }
        else
        {
            loading=false;
            obj.renderer.material.mainTexture = www.texture;
            www=null;
        }
    }
    void OnGUI ()
    {
    //~ GUI.Skin=big;
    if(loading)
    {

        GUI.Label(new Rect(100,30,200,30),"", progressbar_bj);
        GUI.Label(new Rect(100,30,www.progress*200,30),"", progressbar_qj);
        GUI.Label (new Rect (150,35, 200, 30),"Loading:    "+(www.progress*100).ToString().Substring(0,2)+"%");
    }
    }

    public IEnumerator ABC(string URL)
    {
        www = new WWW (URL);
        yield return www;
    }
}